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2004 Volume 15 Issue 1
2004, 15(1): 1-4
Abstract:
Intramolecular cyclization of N-alkoxyl amines are studied for the stereoselective preparation of 2, 4-disubstituted pyrrolidine derivatives. Reduction of oximes under acidic conditions by NaBH3CN afforded the corresponding nucleophilic hydroxylamine derivatives, which subsequently cyclized via SN2'mechanism to give the desired N-alkoxyl pyrrolidines.
Intramolecular cyclization of N-alkoxyl amines are studied for the stereoselective preparation of 2, 4-disubstituted pyrrolidine derivatives. Reduction of oximes under acidic conditions by NaBH3CN afforded the corresponding nucleophilic hydroxylamine derivatives, which subsequently cyclized via SN2'mechanism to give the desired N-alkoxyl pyrrolidines.
2004, 15(1): 5-6
Abstract:
1, 6-Cyclododecanedione and 1, 8-cyclotetradecanedione were prepared from bis-Grig-nard reagent and dinitriles. This is a convenient synthetic method for large-ring cycloalkanediones.
1, 6-Cyclododecanedione and 1, 8-cyclotetradecanedione were prepared from bis-Grig-nard reagent and dinitriles. This is a convenient synthetic method for large-ring cycloalkanediones.
2004, 15(1): 7-10
Abstract:
Novel 1, 3, 4-thia(oxa)diazoles containing thienyl groups were synthesized. Analogous to the naturally-occurring compound, α-terthienyl, they can be photosensitized by ultraviolet light and showed phototoxicities against the 2nd instar larvae of southern armyworm (Pseudaletia separata Walker), they also showed photocleavage action to pBR322 DNA.
Novel 1, 3, 4-thia(oxa)diazoles containing thienyl groups were synthesized. Analogous to the naturally-occurring compound, α-terthienyl, they can be photosensitized by ultraviolet light and showed phototoxicities against the 2nd instar larvae of southern armyworm (Pseudaletia separata Walker), they also showed photocleavage action to pBR322 DNA.
2004, 15(1): 11-13
Abstract:
C60-Containing poly(ethylene oxide) (PEO) was synthesized by a new method. Molecular structural characterization for the polymers was presented by 1H-NMR, infrared and UV-Vis spectra.
C60-Containing poly(ethylene oxide) (PEO) was synthesized by a new method. Molecular structural characterization for the polymers was presented by 1H-NMR, infrared and UV-Vis spectra.
2004, 15(1): 14-16
Abstract:
The synthesis of 2-alkyl(aryl)-3-methylthiopyrano[4, 3-c]pyrazol-4(2H)-ones via 5, 6-dihydro-2H-pyran-2, 4-dione-3-dithioacetals with (un)substituted hydrazines is described and the mechanism of the formation of title compounds is discussed. Their structures were confirmed by 1HNMR spectra and elemental analysis.
The synthesis of 2-alkyl(aryl)-3-methylthiopyrano[4, 3-c]pyrazol-4(2H)-ones via 5, 6-dihydro-2H-pyran-2, 4-dione-3-dithioacetals with (un)substituted hydrazines is described and the mechanism of the formation of title compounds is discussed. Their structures were confirmed by 1HNMR spectra and elemental analysis.
2004, 15(1): 17-18
Abstract:
A new diamine, disodium 4, 4'-di(4-aminophenoxy)-3, 3'-disulfonate-1, 1'-diphenyl-ketone, was prepared from the nucleophilic substitution of disodium 4, 4'-difluoro-3, 3'-di-sulfonate-1, 1'-diphenylketone and p-aminophenol. Polymerization of this diamine and 4, 4'-diamino-1, 1'-diphenyl ether with 3, 3', 4, 4'-tetracarboxyl dianhydride-1, 1'-diphenyl ketone gave ion-exchange copolyimide. The new diamine and its polyimide were characterized with 1H-NMR and FT-IR.
A new diamine, disodium 4, 4'-di(4-aminophenoxy)-3, 3'-disulfonate-1, 1'-diphenyl-ketone, was prepared from the nucleophilic substitution of disodium 4, 4'-difluoro-3, 3'-di-sulfonate-1, 1'-diphenylketone and p-aminophenol. Polymerization of this diamine and 4, 4'-diamino-1, 1'-diphenyl ether with 3, 3', 4, 4'-tetracarboxyl dianhydride-1, 1'-diphenyl ketone gave ion-exchange copolyimide. The new diamine and its polyimide were characterized with 1H-NMR and FT-IR.
2004, 15(1): 19-22
Abstract:
Some new derivatives of 3-ethoxycarbonyl-6-bromo-5-hydroxyindoles were designed and prepared, their antiviral activity were determined in cell culture with virus cytopathic effect assay. The results showed compound Ⅶ b, Ⅶ h exhibited potential antiviral activity.
Some new derivatives of 3-ethoxycarbonyl-6-bromo-5-hydroxyindoles were designed and prepared, their antiviral activity were determined in cell culture with virus cytopathic effect assay. The results showed compound Ⅶ b, Ⅶ h exhibited potential antiviral activity.
2004, 15(1): 23-25
Abstract:
A series of novel 9-fluoro-10-(4-methylpiperazin-1-yl)-3-substituted-8-oxo-8H-[1, 2, 4] triazolo[3, 4-b]thiadiazino[6, 5, 4-ij]quinoline-7-carboxylic acids was prepared by a facile synthetic method and the in vitro antibacterial activity against Gram-postive (G+) and Gram negative (G-) bacteria was primarily evaluated.
A series of novel 9-fluoro-10-(4-methylpiperazin-1-yl)-3-substituted-8-oxo-8H-[1, 2, 4] triazolo[3, 4-b]thiadiazino[6, 5, 4-ij]quinoline-7-carboxylic acids was prepared by a facile synthetic method and the in vitro antibacterial activity against Gram-postive (G+) and Gram negative (G-) bacteria was primarily evaluated.
2004, 15(1): 26-28
Abstract:
Two substituted 3H-indole quaternary ammonium molecules were designed and synthesized using hexamethylphosphoramide (HMPA) as a solvent. The products were purified and characterized by IR, 1H NMR, MS and elemental analysis.
Two substituted 3H-indole quaternary ammonium molecules were designed and synthesized using hexamethylphosphoramide (HMPA) as a solvent. The products were purified and characterized by IR, 1H NMR, MS and elemental analysis.
2004, 15(1): 29-31
Abstract:
A new kind of conjugated polymer, acetylenic polysilazane was prepared by ammono-lysis of acetylenic dimethylchlorosilane. The polymer was characterized by 29Si、13C NMR and elemental analysis.
A new kind of conjugated polymer, acetylenic polysilazane was prepared by ammono-lysis of acetylenic dimethylchlorosilane. The polymer was characterized by 29Si、13C NMR and elemental analysis.
2004, 15(1): 32-34
Abstract:
The synthesis of a new type of polymers with main chain chirality based on BINOL skeleton is described. Titanium-BINOLate catalysts are easily generated from these polymers and applied to the asymmetric reaction of Et2Zn with benzaldehyde. The products are obtained in good yields with moderate enantioselectivities.
The synthesis of a new type of polymers with main chain chirality based on BINOL skeleton is described. Titanium-BINOLate catalysts are easily generated from these polymers and applied to the asymmetric reaction of Et2Zn with benzaldehyde. The products are obtained in good yields with moderate enantioselectivities.
2004, 15(1): 35-36
Abstract:
The palladium catalyzed hydrostannation of 1-alkenylphosphonates gives the (E)-α-stannyl 1-alkenylphosphonates 2 stereospecifically. Compounds 2 can occur Stille coupling reaction to afford α, β-disubstituted vinylphosphonates with the retention of the configuration.
The palladium catalyzed hydrostannation of 1-alkenylphosphonates gives the (E)-α-stannyl 1-alkenylphosphonates 2 stereospecifically. Compounds 2 can occur Stille coupling reaction to afford α, β-disubstituted vinylphosphonates with the retention of the configuration.
2004, 15(1): 37-40
Abstract:
A biodegradable gene transfer vector, poly(ethylenimine)-grafted-poly[(aspartic acid)-co-lysine] has been developed by thermal polycondensation of aspartic acid and lysine, and branch poly(ethylenimine) (Mw less than 600) was grafted to the backbone. The polymer was characterized by 1H NMR. It appeared lower cytotoxity compared to poly(ethylenimine) (25KDa), which was quantified by MTT assay. Electrophoresis indicated that the polymer could retardate DNA at N/P ratio 1.2-1.8 (w/w). Transfection efficiency of the complexes was studied in NT2 cell lines. It was 1.5 fold higher than molecular weight PEI (Mw=25KDa).
A biodegradable gene transfer vector, poly(ethylenimine)-grafted-poly[(aspartic acid)-co-lysine] has been developed by thermal polycondensation of aspartic acid and lysine, and branch poly(ethylenimine) (Mw less than 600) was grafted to the backbone. The polymer was characterized by 1H NMR. It appeared lower cytotoxity compared to poly(ethylenimine) (25KDa), which was quantified by MTT assay. Electrophoresis indicated that the polymer could retardate DNA at N/P ratio 1.2-1.8 (w/w). Transfection efficiency of the complexes was studied in NT2 cell lines. It was 1.5 fold higher than molecular weight PEI (Mw=25KDa).
2004, 15(1): 41-42
Abstract:
A new sesquiterpene polyol ester, angulatin D, has been isolated from the root bark of Celastrus angulatus. The chemical structure is elucidated on the basis of spectral analysis.
A new sesquiterpene polyol ester, angulatin D, has been isolated from the root bark of Celastrus angulatus. The chemical structure is elucidated on the basis of spectral analysis.
2004, 15(1): 43-45
Abstract:
From the ethanol extract of the whole plant of Boschniakia himalaica Hook. f. et. Thoms, a new and two known lignans have been isolated and identified as 7-methoxypinoresino 1, pinoresinol 2, and pinoresinol-O-β-D-glucopyranoside 3 respectively. Their structures have been established by spectroscopic methods.
From the ethanol extract of the whole plant of Boschniakia himalaica Hook. f. et. Thoms, a new and two known lignans have been isolated and identified as 7-methoxypinoresino 1, pinoresinol 2, and pinoresinol-O-β-D-glucopyranoside 3 respectively. Their structures have been established by spectroscopic methods.
2004, 15(1): 46-48
Abstract:
Three new dammarane-type glycosides (1-3) had been isolated from the aerial part of Gynostemma pentaphyllum (Thunb) Makino. The structures of compounds 1-3 had been elucidated as 3β, 12β, 25-trihydroxy-20(S), 24(S)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylo-pyranoside, 3β, 12β, 25-trihydroxy-20(S), 24(R)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylopyranoside and 3β, 12β, 23β, 25-tetrahydroxy-20(S), 24(S)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylopyranoside, respectively, on the basis of chemical and spectro-scopic methods.
Three new dammarane-type glycosides (1-3) had been isolated from the aerial part of Gynostemma pentaphyllum (Thunb) Makino. The structures of compounds 1-3 had been elucidated as 3β, 12β, 25-trihydroxy-20(S), 24(S)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylo-pyranoside, 3β, 12β, 25-trihydroxy-20(S), 24(R)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylopyranoside and 3β, 12β, 23β, 25-tetrahydroxy-20(S), 24(S)-epoxydammarane 3-O-β-D-glucopyranosyl (1→2)-β-D-xylopyranoside, respectively, on the basis of chemical and spectro-scopic methods.
2004, 15(1): 49-51
Abstract:
Two new iridoid glucosides 1 and 2, 10-O-(3, 4-dimethoxy-(E)-cinnamoyl)catalpol and 10-O-(3, 4-dimethoxy-(Z)-cinnamoyl)catalpol, were isolated from Lagotis yunnanensis. Their structures were elucidated by spectroscopic methods.
Two new iridoid glucosides 1 and 2, 10-O-(3, 4-dimethoxy-(E)-cinnamoyl)catalpol and 10-O-(3, 4-dimethoxy-(Z)-cinnamoyl)catalpol, were isolated from Lagotis yunnanensis. Their structures were elucidated by spectroscopic methods.
2004, 15(1): 52-54
Abstract:
Further phytochemical investigation of the ethyl acetate extract of the stem of Daphniphyllum oldhamii afforded a new phenolic glucoside, named oldhamioside 1, together with eleven known compounds, koaburaside 2, betulin, 28-hydroxyl-3-lupenone, pineresinol, syringaresinol, 4-O-methyl-cedrusin, narigenin, eriodictyol, apigenin, loureirin C, and asperuloside. The structures of new and known compounds were characterized by detailed spectroscopic analysis and comparison of their spectral data with reported values.
Further phytochemical investigation of the ethyl acetate extract of the stem of Daphniphyllum oldhamii afforded a new phenolic glucoside, named oldhamioside 1, together with eleven known compounds, koaburaside 2, betulin, 28-hydroxyl-3-lupenone, pineresinol, syringaresinol, 4-O-methyl-cedrusin, narigenin, eriodictyol, apigenin, loureirin C, and asperuloside. The structures of new and known compounds were characterized by detailed spectroscopic analysis and comparison of their spectral data with reported values.
2004, 15(1): 55-57
Abstract:
A new triterpenoid saponin, named segetoside L, was isolated from the seeds of Vaccaria segetalis. On the basis of spectral data and chemical reaction, its structure was established as 28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl oleanolic acid 3-O-β-D-glucopyranosyl-(1→3)-[β-D-galactopyranosyl-(1→2)]-β-D-galactopyranoside.
A new triterpenoid saponin, named segetoside L, was isolated from the seeds of Vaccaria segetalis. On the basis of spectral data and chemical reaction, its structure was established as 28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl oleanolic acid 3-O-β-D-glucopyranosyl-(1→3)-[β-D-galactopyranosyl-(1→2)]-β-D-galactopyranoside.
2004, 15(1): 58-60
Abstract:
Two novel compounds, named sphaerophyside SC and SD were isolated from the ethanolic extract of the seeds of Sphaerophysa salsula. The structures of the compounds were elucidated on the basis of the NMR data, especially the 2D NMR technique.
Two novel compounds, named sphaerophyside SC and SD were isolated from the ethanolic extract of the seeds of Sphaerophysa salsula. The structures of the compounds were elucidated on the basis of the NMR data, especially the 2D NMR technique.
2004, 15(1): 61-62
Abstract:
A new biflavonoid, stelleranol, was isolated from the roots of Stellera chamaejasme L.. Its structure was determined by the analysis of MS and NMR data, especially 2D NMR spectra.
A new biflavonoid, stelleranol, was isolated from the roots of Stellera chamaejasme L.. Its structure was determined by the analysis of MS and NMR data, especially 2D NMR spectra.
2004, 15(1): 63-64
Abstract:
A new picrotoxane type sesquiterpene named dendrodensiflorol has been isolated from the stems of Dendrobium densiflorum. Its structure was identified on the basis of spectroscopic method.
A new picrotoxane type sesquiterpene named dendrodensiflorol has been isolated from the stems of Dendrobium densiflorum. Its structure was identified on the basis of spectroscopic method.
2004, 15(1): 65-67
Abstract:
A protoilludane sesquiterpene (named xanthocerapene) was isolated from the wood of Xanthoceras sorbifolia Bunge. Its structure, including the relative configuration was established by spectroscopic and chemical methods.
A protoilludane sesquiterpene (named xanthocerapene) was isolated from the wood of Xanthoceras sorbifolia Bunge. Its structure, including the relative configuration was established by spectroscopic and chemical methods.
2004, 15(1): 68-70
Abstract:
Two new pyrrolizidines named lankongensisine A (1), B (2) were isolated from the roots of Ligularia lankongensis collected in Lijiang, Yunnan, and their structures were established by spectroscopic analysis.
Two new pyrrolizidines named lankongensisine A (1), B (2) were isolated from the roots of Ligularia lankongensis collected in Lijiang, Yunnan, and their structures were established by spectroscopic analysis.
2004, 15(1): 71-73
Abstract:
Dynamic properties of polymethylvinylsiloxane (PMVS) filled with surface-treated silica (SiO2) were studied using an advanced rheometric expansion system (ARES). The results revealed that the coupling agent, bis (3-triethoxysilylpropyl) tetrasulfane (TESPT) exerted a pronounced effect on the storage modulus (G'), and the effect of TESPT involved a frequency-dependent relation.
Dynamic properties of polymethylvinylsiloxane (PMVS) filled with surface-treated silica (SiO2) were studied using an advanced rheometric expansion system (ARES). The results revealed that the coupling agent, bis (3-triethoxysilylpropyl) tetrasulfane (TESPT) exerted a pronounced effect on the storage modulus (G'), and the effect of TESPT involved a frequency-dependent relation.
2004, 15(1): 74-76
Abstract:
The viscoelastic behavior of melts for two systems composed of intercalated nanocomposites based on low density polyethylene and 3 wt% loading of cetyltrimethyl-ammonium bromide modified montmorillonite was studied. The results obtained through examining the dynamic storage module G'and dynamic loss module G" values of the composite revealed that the dynamic viscoelastic properties of composite strongly depended on intercalation of polymer, and exhibited dramatically change with altering intercalation conditions. Only when modified montmorillonite content was about 3 wt%, the composite showed a trend of pseudo-solidlike at lower frequencies.
The viscoelastic behavior of melts for two systems composed of intercalated nanocomposites based on low density polyethylene and 3 wt% loading of cetyltrimethyl-ammonium bromide modified montmorillonite was studied. The results obtained through examining the dynamic storage module G'and dynamic loss module G" values of the composite revealed that the dynamic viscoelastic properties of composite strongly depended on intercalation of polymer, and exhibited dramatically change with altering intercalation conditions. Only when modified montmorillonite content was about 3 wt%, the composite showed a trend of pseudo-solidlike at lower frequencies.
2004, 15(1): 77-79
Abstract:
Poly (vinyl chloride)/ethylene-vinyl acetate/montmorillonite (PVC/EVA/OMMT) composites were prepared by melt blending method. Two kinds of montmorillonites were organically modified by trimethyloctadecyl ammonium and dimethyl bis (hydrogenated tallow) ammonium, respectively. The morphology and tensile properties of the resultant composites were discussed in terms of the modifier type and OMMT content. The PVC/EVA/OMMT composites have intercalated structure, which is independent of the polarity of the modifiers, while the tensile properties show strong dependence on the modifier type. The OMMT modified by polar modifier gives higher tensile ductile and strength of PVC/EVA/OMMT composites.
Poly (vinyl chloride)/ethylene-vinyl acetate/montmorillonite (PVC/EVA/OMMT) composites were prepared by melt blending method. Two kinds of montmorillonites were organically modified by trimethyloctadecyl ammonium and dimethyl bis (hydrogenated tallow) ammonium, respectively. The morphology and tensile properties of the resultant composites were discussed in terms of the modifier type and OMMT content. The PVC/EVA/OMMT composites have intercalated structure, which is independent of the polarity of the modifiers, while the tensile properties show strong dependence on the modifier type. The OMMT modified by polar modifier gives higher tensile ductile and strength of PVC/EVA/OMMT composites.
2004, 15(1): 79-82
Abstract:
Pyrite nickel disulfide and millerite nickel monosulfide have been successfully prepared by solvothermal method based on the reaction of Ni(NO3)2·6H2O and H2NC(S)NH2 in benzene and ethylenediamine (EDA). The final products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM). The effects of the solvent, reaction temperature and time on the morphology and phase of the products have been discussed.
Pyrite nickel disulfide and millerite nickel monosulfide have been successfully prepared by solvothermal method based on the reaction of Ni(NO3)2·6H2O and H2NC(S)NH2 in benzene and ethylenediamine (EDA). The final products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM). The effects of the solvent, reaction temperature and time on the morphology and phase of the products have been discussed.
2004, 15(1): 83-86
Abstract:
The silicate colloids with an average diameter 100 nm, were prepared by the hydrolysis of tetraethoxysilane (TES), NH4OH (30%) and then modified by (3-mercaptopropyl) trimethoxysilane ( APS). The colloids can adsorb heavy metals such as Pb and Cr in effluent and after adsorption the colloids can be separated by coagulation of aluminum sulfate. The removal of heavy metals is up to 99%.
The silicate colloids with an average diameter 100 nm, were prepared by the hydrolysis of tetraethoxysilane (TES), NH4OH (30%) and then modified by (3-mercaptopropyl) trimethoxysilane ( APS). The colloids can adsorb heavy metals such as Pb and Cr in effluent and after adsorption the colloids can be separated by coagulation of aluminum sulfate. The removal of heavy metals is up to 99%.
2004, 15(1): 87-89
Abstract:
Network polymer electrolytes with free oligo(oxyethylene) chains as internal plasticizers were prepared by cross-linking poly(ethylene glycol) acrylates. The effects of salt concentration and properties of internal plasticizers on ionic conductivity were studied.
Network polymer electrolytes with free oligo(oxyethylene) chains as internal plasticizers were prepared by cross-linking poly(ethylene glycol) acrylates. The effects of salt concentration and properties of internal plasticizers on ionic conductivity were studied.
2004, 15(1): 90-92
Abstract:
The urea decomposition property at high temperature has been used to control the pH value in the synthesis of layer compounds. The hydrotalcites of Mg-Al and Ni-Al with high crystallinity were synthesized by using this property.
The urea decomposition property at high temperature has been used to control the pH value in the synthesis of layer compounds. The hydrotalcites of Mg-Al and Ni-Al with high crystallinity were synthesized by using this property.
2004, 15(1): 93-96
Abstract:
The incorporation of ZnO into Fe2O3-K2O system increases its activity, enhances its moisture stability and mechanical strength. The origin of the enhancement in activity and moisture stability is discussed in the light of experimental results obtained by BET, XRD, XPS. It was found that the addition of ZnO to Fe2O3-K2O system strengthens the interaction between Fe2O3 and K2O, reduces the formation temperature of KFe11O17 at least by 50℃, and promotes the transformation of Fe3+ to Fe2+ further.
The incorporation of ZnO into Fe2O3-K2O system increases its activity, enhances its moisture stability and mechanical strength. The origin of the enhancement in activity and moisture stability is discussed in the light of experimental results obtained by BET, XRD, XPS. It was found that the addition of ZnO to Fe2O3-K2O system strengthens the interaction between Fe2O3 and K2O, reduces the formation temperature of KFe11O17 at least by 50℃, and promotes the transformation of Fe3+ to Fe2+ further.
2004, 15(1): 97-100
Abstract:
Ordered ZnS semiconductor nanoparticles were in situ synthesized in metal halide perovskite organic/inorganic layered hybrids (CnH2n+1NH3)2ZnCl4 (n=10 and 12) by reaction of their spin-casting films with H2S gas. Transmission electron microscopy, UV-vis spectroscopy and small-angle X-ray diffraction were used to characterize the morphology and the structure of formed nanoparticles. Obtained results indicate an effective way to incorporate functional inorganic nanoparticles into structured organic matrices.
Ordered ZnS semiconductor nanoparticles were in situ synthesized in metal halide perovskite organic/inorganic layered hybrids (CnH2n+1NH3)2ZnCl4 (n=10 and 12) by reaction of their spin-casting films with H2S gas. Transmission electron microscopy, UV-vis spectroscopy and small-angle X-ray diffraction were used to characterize the morphology and the structure of formed nanoparticles. Obtained results indicate an effective way to incorporate functional inorganic nanoparticles into structured organic matrices.
2004, 15(1): 101-104
Abstract:
Three kinds of platinum electrodes with different geometry were designed. The relation of the electrochemiluminescence (ECL) intensity with the geometry of these electrodes has been investigated. The optical character of these electrodes was directly studied by observation of ECL image and measurement of the ECL intensity. The results showed that the ECL not only concentrated on the edge of the electrode but also concentrated on the edge of holes, which contain in the electrode. The ECL intensity from Ru(bpy)3Cl2·6H2O on round electrode was about half of that on four-hole round disk electrode for a same concentration of Ru(bpy)3Cl2·6H2O, so the detection limit was improved to 10-18 mol/L Ru(bpy)3Cl2·6H2O on four-hole round disk electrode, three times higher than that on round disk electrode.
Three kinds of platinum electrodes with different geometry were designed. The relation of the electrochemiluminescence (ECL) intensity with the geometry of these electrodes has been investigated. The optical character of these electrodes was directly studied by observation of ECL image and measurement of the ECL intensity. The results showed that the ECL not only concentrated on the edge of the electrode but also concentrated on the edge of holes, which contain in the electrode. The ECL intensity from Ru(bpy)3Cl2·6H2O on round electrode was about half of that on four-hole round disk electrode for a same concentration of Ru(bpy)3Cl2·6H2O, so the detection limit was improved to 10-18 mol/L Ru(bpy)3Cl2·6H2O on four-hole round disk electrode, three times higher than that on round disk electrode.
2004, 15(1): 105-108
Abstract:
A series of monometallic nitrides and bimetallic nitrides were prepared by temperature-programmed reaction with NH3. The effects of Co, Ni and Fe additives and the synergic action between Fe, Co, Ni and Mo on the ammonia decomposition activity were investigated. TPR-MS, XRD were also carried out to obtain better insight into the structure of the bimetallic nitride. The results of ammonia decomposition activity show that bimetallic nitrides are more active than monometallic nitrides or bimetallic oxides.
A series of monometallic nitrides and bimetallic nitrides were prepared by temperature-programmed reaction with NH3. The effects of Co, Ni and Fe additives and the synergic action between Fe, Co, Ni and Mo on the ammonia decomposition activity were investigated. TPR-MS, XRD were also carried out to obtain better insight into the structure of the bimetallic nitride. The results of ammonia decomposition activity show that bimetallic nitrides are more active than monometallic nitrides or bimetallic oxides.
2004, 15(1): 109-111
Abstract:
otal internal reflection fluorescence spectroscopy (TIRF) and synchronous scanning technique were combined to study the adsorption behavior of the meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS) at the glass-water interface without any surfactant. The pH dependence of synchronous fluorescence signal at the interface was analyzed. Both unprotonated (TPPS4-) and diprotonated (H2TPPS2-) forms of TPPS were observed at the interface. But the interface favored the adsorption of. The apparent estimated pKa2 value shifted from 5.00 in the bulk solution to 2.7 at the interface. STIRF provides a good technique to study multi-component systems at the interface.
otal internal reflection fluorescence spectroscopy (TIRF) and synchronous scanning technique were combined to study the adsorption behavior of the meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS) at the glass-water interface without any surfactant. The pH dependence of synchronous fluorescence signal at the interface was analyzed. Both unprotonated (TPPS4-) and diprotonated (H2TPPS2-) forms of TPPS were observed at the interface. But the interface favored the adsorption of. The apparent estimated pKa2 value shifted from 5.00 in the bulk solution to 2.7 at the interface. STIRF provides a good technique to study multi-component systems at the interface.
2004, 15(1): 112-114
Abstract:
A method using carboxymethyl-β-cyclodextrin(CM-β-CD) as selector for chiral separation of amino acids by capillary electrophoresis and laser-induced fluorescence detection was studied. Resolution was better than that obtained byβ-CD or HP-β-CD.
A method using carboxymethyl-β-cyclodextrin(CM-β-CD) as selector for chiral separation of amino acids by capillary electrophoresis and laser-induced fluorescence detection was studied. Resolution was better than that obtained byβ-CD or HP-β-CD.
2004, 15(1): 115-117
Abstract:
The oxidation of methanol was investigated on platinum-modified polyaniline electrode. Changes in the electrode rotation rates (Ω) during platinum electrodeposition remarkably affect the formation and distribution of platinum in the polymer matrix and consequently lead to different currents of methanol oxidation. The results show that platinum loading is proportional to rotation rates Ω1/2.
The oxidation of methanol was investigated on platinum-modified polyaniline electrode. Changes in the electrode rotation rates (Ω) during platinum electrodeposition remarkably affect the formation and distribution of platinum in the polymer matrix and consequently lead to different currents of methanol oxidation. The results show that platinum loading is proportional to rotation rates Ω1/2.
2004, 15(1): 118-120
Abstract:
A new benzoazacrown ether fluorescence sensor was synthesized with 9-anthrylmethyl chloride and benzoaza-15-crown-5 in CH3CN, which particularly shows a strong affinity for Zn2+. Its fluorescence quantum yield increase more than one order of magnitude and a red shift could be noticed when passing from the apolar to the polar solvent.
A new benzoazacrown ether fluorescence sensor was synthesized with 9-anthrylmethyl chloride and benzoaza-15-crown-5 in CH3CN, which particularly shows a strong affinity for Zn2+. Its fluorescence quantum yield increase more than one order of magnitude and a red shift could be noticed when passing from the apolar to the polar solvent.
Capillary Electrophoretic Immunoassay with Laser-induced Fluorescence Detection for Interferon-gamma
2004, 15(1): 121-122
Abstract:
Capillary electrophoretic immunoassay with laser-induced fluorescence detection for recombinant human interferon-gamma (IFN-γ) was established. The limits of detection for three forms of IFN-γare 6.9 ng/L, 5.7 ng/L and 5.0 ng/L, respectively.
Capillary electrophoretic immunoassay with laser-induced fluorescence detection for recombinant human interferon-gamma (IFN-γ) was established. The limits of detection for three forms of IFN-γare 6.9 ng/L, 5.7 ng/L and 5.0 ng/L, respectively.
2004, 15(1): 123-126
Abstract:
ONIOM quantum mechanics method is used in this paper to study one-carbon unit transfer from imidazolidine to 6-aminouracil derivates. The computation results show that this reaction can be completed via three paths owing to the three different proton transfer modes. By calculation and analysis, we can find the direct proton transfer is the preferable pathway.
ONIOM quantum mechanics method is used in this paper to study one-carbon unit transfer from imidazolidine to 6-aminouracil derivates. The computation results show that this reaction can be completed via three paths owing to the three different proton transfer modes. By calculation and analysis, we can find the direct proton transfer is the preferable pathway.
