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2002 Volume 13 Issue 4
2002, 13(4): 283-284
Abstract:
Selenium was inserted into the zinc carbon bond of aryl zinc halides to form corresponding zinc selenoates.They reacted in THF-HMPA with acylhalides to afford the selenoesters in high yields.
Selenium was inserted into the zinc carbon bond of aryl zinc halides to form corresponding zinc selenoates.They reacted in THF-HMPA with acylhalides to afford the selenoesters in high yields.
2002, 13(4): 285-286
Abstract:
One-pot reaction of aldehydes,α-haloketones and (phenylsulfonyl)acetonitrile promoted by SmI3 proceeded smoothly to give 1-cyano-1-phenylsulfonyl-2-aryl-3-aroyl-propane derivatives in moderate to good yields.
One-pot reaction of aldehydes,α-haloketones and (phenylsulfonyl)acetonitrile promoted by SmI3 proceeded smoothly to give 1-cyano-1-phenylsulfonyl-2-aryl-3-aroyl-propane derivatives in moderate to good yields.
2002, 13(4): 287-289
Abstract:
The rearrangement reaction of 2-benzothiazolylthioacetyl hydrazide 1 with potassium hydroxide and carbon disulfide in ethanol to produce s-triazolo[3,4-b]benzothiazole-3-thiol 3 was described.3 also can be obtained from 2-benzothiazolylhydazine 2 and the two methods for getting 3 were compared.Mannich reaction of compounds 3 was reported too.
The rearrangement reaction of 2-benzothiazolylthioacetyl hydrazide 1 with potassium hydroxide and carbon disulfide in ethanol to produce s-triazolo[3,4-b]benzothiazole-3-thiol 3 was described.3 also can be obtained from 2-benzothiazolylhydazine 2 and the two methods for getting 3 were compared.Mannich reaction of compounds 3 was reported too.
2002, 13(4): 290-291
Abstract:
Facile synthesis of 6(E)-geranylgeraniol-19-oic acid 1,a naturally occurring alicyclic diterpene acid,by a Horner-Wadsworth-Emmons olefination of two readily available fragments 2 and 3,is described.
Facile synthesis of 6(E)-geranylgeraniol-19-oic acid 1,a naturally occurring alicyclic diterpene acid,by a Horner-Wadsworth-Emmons olefination of two readily available fragments 2 and 3,is described.
2002, 13(4): 292-293
Abstract:
Four 5-deoxy-5-acyloxyiminoavermectin B1 derivatives 4a~d were synthesized via three steps from avermectin B1 and their biological activities were tested against Heliothis armigera,Laphygma exigua and Musca domestica.
Four 5-deoxy-5-acyloxyiminoavermectin B1 derivatives 4a~d were synthesized via three steps from avermectin B1 and their biological activities were tested against Heliothis armigera,Laphygma exigua and Musca domestica.
2002, 13(4): 294-295
Abstract:
A series of novel type of glycophosphate mimics are synthesized by Todd reaction and their structure were determined on the basis of NMR,ESI-MS.
A series of novel type of glycophosphate mimics are synthesized by Todd reaction and their structure were determined on the basis of NMR,ESI-MS.
2002, 13(4): 296-298
Abstract:
Phenyl sulfone-containing 2,3-diarylindole derivatives were designed and identified to be selective COX-2 inhibitors.A convenient synthetic route was also developed for the synthesis of the novel inhibitors.
Phenyl sulfone-containing 2,3-diarylindole derivatives were designed and identified to be selective COX-2 inhibitors.A convenient synthetic route was also developed for the synthesis of the novel inhibitors.
2002, 13(4): 299-302
Abstract:
The photochromic spiropyrans and spirooxazine having a succinimidyl ester or isothiocyanate pendant group can form covalent products with transaminated DNA. The absorption spectra and solid reflection spectra of modified DNA with these photochromic spiro compounds were investigated.
The photochromic spiropyrans and spirooxazine having a succinimidyl ester or isothiocyanate pendant group can form covalent products with transaminated DNA. The absorption spectra and solid reflection spectra of modified DNA with these photochromic spiro compounds were investigated.
2002, 13(4): 303-305
Abstract:
3,6-di-O-acetyl-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-2-azido-2-deoxy-β-D-glucoppyranosyl nitrate could be separated from its mannose type isomer by glycosylation according to the reactivity difference of these two compounds.The pure glucose type nitrate can be converted to corresponding trichloroacemidate,which reacted with spacer arms in solution of CH2Cl2 with BF3·Et2O as promoters to give desired glycosides and dimers.
3,6-di-O-acetyl-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-2-azido-2-deoxy-β-D-glucoppyranosyl nitrate could be separated from its mannose type isomer by glycosylation according to the reactivity difference of these two compounds.The pure glucose type nitrate can be converted to corresponding trichloroacemidate,which reacted with spacer arms in solution of CH2Cl2 with BF3·Et2O as promoters to give desired glycosides and dimers.
2002, 13(4): 306-307
Abstract:
Polythiophene (PTh) was prepared by the direct electrochemical synthesis in an ionic liquid ([BMIM]PF6 containing 0.1 mol/L thiophene by cyclic voltammetry,constant potential and constant current techniques.It is found that smooth and blue-green PTh films can be obtained at a potential of ca.+1.75 V (vs.Ag/AgCl) or a current of ca.1.5 mA cm-2 in the ionic liquid.
Polythiophene (PTh) was prepared by the direct electrochemical synthesis in an ionic liquid ([BMIM]PF6 containing 0.1 mol/L thiophene by cyclic voltammetry,constant potential and constant current techniques.It is found that smooth and blue-green PTh films can be obtained at a potential of ca.+1.75 V (vs.Ag/AgCl) or a current of ca.1.5 mA cm-2 in the ionic liquid.
2002, 13(4): 308-310
Abstract:
p-1,1,3,3-Tetramethylbutylphenol was prepared by the alkylation of the phenol with Nafion catalyst in extremely high yield.Various reaction conditions were investigated,including the reaction temperature,reaction time,ratio of the starting material,amount of the Nafion catalyst and the recycle times of the catalyst.
p-1,1,3,3-Tetramethylbutylphenol was prepared by the alkylation of the phenol with Nafion catalyst in extremely high yield.Various reaction conditions were investigated,including the reaction temperature,reaction time,ratio of the starting material,amount of the Nafion catalyst and the recycle times of the catalyst.
2002, 13(4): 311-314
Abstract:
Vapor-phase nitration of benzene over solid acid catalyst is expected to be a clean process with no sulfuric acid waste.We investigated this process over solid acidic catalysts utilizing diluted nitric acid (60-70%) as nitrating agent,and found that supported sulfuric acid catalyst exhibited a very high catalytic activity.Under the conditions of reaction temperature 160-170℃,space velocity (SV) 1200 h-1,the yield and the space-time yield (STY) of nitrobenzene (NB) based on HNO3 were more than 98% and 0.75 kg·kgcat-1·h-1 over 10% H2SO4/SiO2 (by weight) catalyst respectively.
Vapor-phase nitration of benzene over solid acid catalyst is expected to be a clean process with no sulfuric acid waste.We investigated this process over solid acidic catalysts utilizing diluted nitric acid (60-70%) as nitrating agent,and found that supported sulfuric acid catalyst exhibited a very high catalytic activity.Under the conditions of reaction temperature 160-170℃,space velocity (SV) 1200 h-1,the yield and the space-time yield (STY) of nitrobenzene (NB) based on HNO3 were more than 98% and 0.75 kg·kgcat-1·h-1 over 10% H2SO4/SiO2 (by weight) catalyst respectively.
2002, 13(4): 315-316
Abstract:
In this paper,(-)menthyl methacrylate((-)MnMA) was polymerized at-78℃ in toluene with three types of anionic catalysts,which were complexes of fluorenyllithium with (-)sparteine-((-)-Sp) ,(S,S)-(+)-2,3-dimethoxy-1,4-bis(dimethylamino)butane((+)DDB) and N,N,N',N'-tetra-methylethylenediamine(TMEDA),and the chiral optical property of the obtained polymer was studied.The circular dichroism (CD) spectrum of the polymer showed negative Cotton effect
In this paper,(-)menthyl methacrylate((-)MnMA) was polymerized at-78℃ in toluene with three types of anionic catalysts,which were complexes of fluorenyllithium with (-)sparteine-((-)-Sp) ,(S,S)-(+)-2,3-dimethoxy-1,4-bis(dimethylamino)butane((+)DDB) and N,N,N',N'-tetra-methylethylenediamine(TMEDA),and the chiral optical property of the obtained polymer was studied.The circular dichroism (CD) spectrum of the polymer showed negative Cotton effect
2002, 13(4): 317-320
Abstract:
Polymer capable of specific binding to Cu-dipyridyl complex was prepared by molecular imprinting technology.The binding specificity of the polymer to the template (Cu-dipyridyl complex) was investigated by cyclic voltametric scanning using the carbon paste electrode modified by polymer particles in phosphate buffer solution.Factors that influence rebinding of the imprinted polymer were explored.The result demonstrated that the cyclic voltammetry was an efficient approach to explore interactions between template and imprinted polymers.
Polymer capable of specific binding to Cu-dipyridyl complex was prepared by molecular imprinting technology.The binding specificity of the polymer to the template (Cu-dipyridyl complex) was investigated by cyclic voltametric scanning using the carbon paste electrode modified by polymer particles in phosphate buffer solution.Factors that influence rebinding of the imprinted polymer were explored.The result demonstrated that the cyclic voltammetry was an efficient approach to explore interactions between template and imprinted polymers.
2002, 13(4): 321-324
Abstract:
A novel oligosaccharide was isolated and purified from the mucus of the loach,Misgurnus anguillicaudatus.It was identified by several qualitative tests and characterized by elementary analysis,UV and IR spectrum.Its average molecular weight (Mw=1539.4) was determined by gel permeation chromatography.The major structural monomers of Misgurnus anguillicaudatus oligosaccharide were identified to be D-galactose and L-fucose by paper chromatography and gas chromatography.
A novel oligosaccharide was isolated and purified from the mucus of the loach,Misgurnus anguillicaudatus.It was identified by several qualitative tests and characterized by elementary analysis,UV and IR spectrum.Its average molecular weight (Mw=1539.4) was determined by gel permeation chromatography.The major structural monomers of Misgurnus anguillicaudatus oligosaccharide were identified to be D-galactose and L-fucose by paper chromatography and gas chromatography.
2002, 13(4): 325-326
Abstract:
A new C-18 phytosphingosine derivative (1) was isolated from the fruiting bodies of Tuber indicum. Its structure was established as (2S, 3S, 4R, 2'R)-2-N-(2/-hydroxytricosano-yl)-octadecan-l, 3,4-triol by spectral and chemical methods.
A new C-18 phytosphingosine derivative (1) was isolated from the fruiting bodies of Tuber indicum. Its structure was established as (2S, 3S, 4R, 2'R)-2-N-(2/-hydroxytricosano-yl)-octadecan-l, 3,4-triol by spectral and chemical methods.
2002, 13(4): 327-330
Abstract:
Rubuphenol (1),a new polyphenolic compound,was isolated together with the known ellagic acid (2) as new cell cycle inhibitors from Rubus aleaefolius Poir.through a bioassay-guided separation procedure and the structure of 1 was elucidated by spectroscopic method.Compounds 1 and 2 inhibited the cell cycle of tsFT210 cells at the G0/G1 phase respectively with the MIC values of 14.6μM and 10.3μM.
Rubuphenol (1),a new polyphenolic compound,was isolated together with the known ellagic acid (2) as new cell cycle inhibitors from Rubus aleaefolius Poir.through a bioassay-guided separation procedure and the structure of 1 was elucidated by spectroscopic method.Compounds 1 and 2 inhibited the cell cycle of tsFT210 cells at the G0/G1 phase respectively with the MIC values of 14.6μM and 10.3μM.
2002, 13(4): 331-332
Abstract:
Huperzine W,a novel 14 carbons Lycopodium alkaloid,was isolated from the whole plant of Huperzia serrata,and its stucture was determined by spectroscopic analysis.
Huperzine W,a novel 14 carbons Lycopodium alkaloid,was isolated from the whole plant of Huperzia serrata,and its stucture was determined by spectroscopic analysis.
2002, 13(4): 333-334
Abstract:
From Senecio saluenensis,a novel eremophilanolide Saluenolide A was isolated.Its structure was elucidated by 2D-NMR technique and X-ray diffraction.
From Senecio saluenensis,a novel eremophilanolide Saluenolide A was isolated.Its structure was elucidated by 2D-NMR technique and X-ray diffraction.
2002, 13(4): 335-336
Abstract:
Two new xanthone glycosides,polygalaxanthone Ⅳ and Ⅴ were isolated from the roots of Polygala tenuifolia Willd.Their structures were established as 6-O-[(α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl]-1-hydroxy-3,7-dimethoxyxanthone (polygalaxanthone IV),and 6-O-[α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl]-1,3-dihydroxy-7-methoxyxanthone (polyga-laxanthone Ⅴ),respectively,on the basis of chemical and spectral evidence.
Two new xanthone glycosides,polygalaxanthone Ⅳ and Ⅴ were isolated from the roots of Polygala tenuifolia Willd.Their structures were established as 6-O-[(α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl]-1-hydroxy-3,7-dimethoxyxanthone (polygalaxanthone IV),and 6-O-[α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl]-1,3-dihydroxy-7-methoxyxanthone (polyga-laxanthone Ⅴ),respectively,on the basis of chemical and spectral evidence.
2002, 13(4): 337-340
Abstract:
Two new C-glucoside flavonoids,namely 8-C-β-D-(2"-O-acetyl) glucofuranosyl apigenin and 3"-O-acetylvitexin,were isolated from leaves of Crataegus pinnatifida Bge.var.major N.E.Br..Their structures were elucidated by the spectroscopic means and chemical evidence.
Two new C-glucoside flavonoids,namely 8-C-β-D-(2"-O-acetyl) glucofuranosyl apigenin and 3"-O-acetylvitexin,were isolated from leaves of Crataegus pinnatifida Bge.var.major N.E.Br..Their structures were elucidated by the spectroscopic means and chemical evidence.
2002, 13(4): 341-342
Abstract:
A new limonoid named rohituka-15 1,with a known limonoid dregeana-1 2,was isolated from the seed of Aphanamixis polystachya (Meliaceae).The 13C NMR data assignment of dregeana-1 2 and the structural elucidation of the new compound 1 were based on spectral analysis including 1H-1H COSY,HMQC and HMBC experiments.
A new limonoid named rohituka-15 1,with a known limonoid dregeana-1 2,was isolated from the seed of Aphanamixis polystachya (Meliaceae).The 13C NMR data assignment of dregeana-1 2 and the structural elucidation of the new compound 1 were based on spectral analysis including 1H-1H COSY,HMQC and HMBC experiments.
2002, 13(4): 343-344
Abstract:
A new germacranolide sesquiterpene lactone,isoscabertopin,was isolated from Elephantopus scaber together with the known scabertopin.Their structures were determined by spectroscopic methods.
A new germacranolide sesquiterpene lactone,isoscabertopin,was isolated from Elephantopus scaber together with the known scabertopin.Their structures were determined by spectroscopic methods.
2002, 13(4): 345-348
Abstract:
Two new pentacyclic triterpene acids,1α,3β-dihydroxyl-olean-12-en-28-oic acid and 1α,2α,3β-trihydroxyl-olean-12-en-28-oic acid,were isolated from the arial parts of Sabia parviflora.
Two new pentacyclic triterpene acids,1α,3β-dihydroxyl-olean-12-en-28-oic acid and 1α,2α,3β-trihydroxyl-olean-12-en-28-oic acid,were isolated from the arial parts of Sabia parviflora.
2002, 13(4): 349-350
Abstract:
Extraction behavior of chlorpromazine hydrochloride (CPZ) and procaine hydro-chloride (PCN) in the system described in the title was studied.Research shows that the extraction efficiency of CPZ can amount to 96% by twice extraction,while that of PCN is 77%.This system produces the distribution coefficients (KD) of 12.3 and 2.6 respectively for CPZ and PCN.Extraction mechanism is deduced according to ultraviolet and molecular fluorescence spectra variation of the drugs in the system studied.
Extraction behavior of chlorpromazine hydrochloride (CPZ) and procaine hydro-chloride (PCN) in the system described in the title was studied.Research shows that the extraction efficiency of CPZ can amount to 96% by twice extraction,while that of PCN is 77%.This system produces the distribution coefficients (KD) of 12.3 and 2.6 respectively for CPZ and PCN.Extraction mechanism is deduced according to ultraviolet and molecular fluorescence spectra variation of the drugs in the system studied.
2002, 13(4): 351-354
Abstract:
In this paper,the adsorption process of calmodulin (CaM) on Au substrate was first investigated with electrochemical impedance spectroscopy (EIS) method.The result reveals that the adsorption of the protein-calmodulin contains two steps,i.e.,one short quick step followed by a slow one.The complexation of calmodulin with Ca2+ was also first probed using EIS technique,in which the complexation of CaM with Ca2+ could be reflected by the change of apparent membrane capacitance(Capp) clearly.In all above measurements,a redox couple Fe(CN)63-/ Fe(CN)64- was used as probing-pin to reflect all the changes occurring in the above process.Our work suggests that some biological processes of CaM could be studied using EIS method conveniently.
In this paper,the adsorption process of calmodulin (CaM) on Au substrate was first investigated with electrochemical impedance spectroscopy (EIS) method.The result reveals that the adsorption of the protein-calmodulin contains two steps,i.e.,one short quick step followed by a slow one.The complexation of calmodulin with Ca2+ was also first probed using EIS technique,in which the complexation of CaM with Ca2+ could be reflected by the change of apparent membrane capacitance(Capp) clearly.In all above measurements,a redox couple Fe(CN)63-/ Fe(CN)64- was used as probing-pin to reflect all the changes occurring in the above process.Our work suggests that some biological processes of CaM could be studied using EIS method conveniently.
2002, 13(4): 355-358
Abstract:
It is a problem to be solved that the experimental selectivity coefficients of ion selective electrodes (ISEs) depend on the activity.This paper studied the new method of determining selectivity coefficients.A mixed ion response equation,which was similar to Nicolsky-Eisenman (N-E) equation recommended by IUPAC,was proposed.The equation includes the practical response slope of ISEs to the primary ion and the interfering ion.The selectivity coefficient was defined by the equation instead of the N-E equation.The experimental part of the method is similar to that based on the N-E equation.The values of selectivity coefficients obtained with this method do not depend on the activity whether the electrodes exhibit the Nernst response or non-Nernst response.The feasibility of the new method is illustrated experimentally.
It is a problem to be solved that the experimental selectivity coefficients of ion selective electrodes (ISEs) depend on the activity.This paper studied the new method of determining selectivity coefficients.A mixed ion response equation,which was similar to Nicolsky-Eisenman (N-E) equation recommended by IUPAC,was proposed.The equation includes the practical response slope of ISEs to the primary ion and the interfering ion.The selectivity coefficient was defined by the equation instead of the N-E equation.The experimental part of the method is similar to that based on the N-E equation.The values of selectivity coefficients obtained with this method do not depend on the activity whether the electrodes exhibit the Nernst response or non-Nernst response.The feasibility of the new method is illustrated experimentally.
2002, 13(4): 359-362
Abstract:
The potential energy surface and reaction mechanism corresponding to the reaction of ytterbium monocation with fluoromethane,which represents a prototype of the activation of C-F bond in fluorohydrocarbons by bare lanthanide cations,have been investigated for the first time by using density functional theory.A direct fluorine abstraction mechanism was revealed,and the related thermochemistry data were determined.The electron-transfer reactivity of the reaction was analyzed using the two-state model,and a strongly avoided crossing behavior on the transition state region was shown.The present results support the reaction mechanism inferred from early experimental data and the related thermochemistry data can provide a guide for further experimental researches.
The potential energy surface and reaction mechanism corresponding to the reaction of ytterbium monocation with fluoromethane,which represents a prototype of the activation of C-F bond in fluorohydrocarbons by bare lanthanide cations,have been investigated for the first time by using density functional theory.A direct fluorine abstraction mechanism was revealed,and the related thermochemistry data were determined.The electron-transfer reactivity of the reaction was analyzed using the two-state model,and a strongly avoided crossing behavior on the transition state region was shown.The present results support the reaction mechanism inferred from early experimental data and the related thermochemistry data can provide a guide for further experimental researches.
2002, 13(4): 363-366
Abstract:
A quantitative structure-property relationship (QSPR) study has been made for the prediction of the surface tension of nonionic surfactants in aqueous solution.The regressed model includes a topological descriptor,the Kier & Hall index of zero order (KH0) of the hydrophobic segment of surfactant and a quantum chemical one,the heat of formation (ΔHf) of surfactant molecules.The established general QSPR between the surface tension and the descriptors produces a correlation coefficient of multiple determination,r2=0.9877,for 30 studied nonionic surfactants.
A quantitative structure-property relationship (QSPR) study has been made for the prediction of the surface tension of nonionic surfactants in aqueous solution.The regressed model includes a topological descriptor,the Kier & Hall index of zero order (KH0) of the hydrophobic segment of surfactant and a quantum chemical one,the heat of formation (ΔHf) of surfactant molecules.The established general QSPR between the surface tension and the descriptors produces a correlation coefficient of multiple determination,r2=0.9877,for 30 studied nonionic surfactants.
2002, 13(4): 367-370
Abstract:
By using the chemical bond theory of dielectric description,the chemical bond parameters of (Tl,Pb)-1223 was calculated.The results show that the Sr-O,Tl-O,and Ca-O types of bond have higher ionic character and the Cu-O types of bond have more covalent character.Mössbauer isomer shifts of 57Fe and 119Sn doped in (Tl,Pb)-1223 were calculated by using the chemical environmental factor,he,defined by covalency and electronic polarizability.Four valence state tin and three valence iron sites were identified in 57Fe,and 119Sn doped (Tl,Pb)-1223 superconductor.We conclude that all of the Fe atoms substitute the Cu at square planar Cu (1) site,whereas Sn prefers to substitute the square pyramidal Cu (2) site.
By using the chemical bond theory of dielectric description,the chemical bond parameters of (Tl,Pb)-1223 was calculated.The results show that the Sr-O,Tl-O,and Ca-O types of bond have higher ionic character and the Cu-O types of bond have more covalent character.Mössbauer isomer shifts of 57Fe and 119Sn doped in (Tl,Pb)-1223 were calculated by using the chemical environmental factor,he,defined by covalency and electronic polarizability.Four valence state tin and three valence iron sites were identified in 57Fe,and 119Sn doped (Tl,Pb)-1223 superconductor.We conclude that all of the Fe atoms substitute the Cu at square planar Cu (1) site,whereas Sn prefers to substitute the square pyramidal Cu (2) site.
2002, 13(4): 371-374
Abstract:
Semidifferential electroanalysis is used as an effective method for investigating microstructure and structural transition of Triton X-100 microemulsions.
Semidifferential electroanalysis is used as an effective method for investigating microstructure and structural transition of Triton X-100 microemulsions.
2002, 13(4): 375-378
Abstract:
Synergetic effects for p-nitrophenol degradation were observed in the combination of two-advanced oxidation processes,UV/Fe3+ and electrocatalysis.The enhancement of removal rate for p-nitrophenol and COD was around 123% and 278%,respectively.The possible contributions for the synergetic effects were the electrochemically regeneration of ferric ion and the role of the oxygen that formed on the anode.
Synergetic effects for p-nitrophenol degradation were observed in the combination of two-advanced oxidation processes,UV/Fe3+ and electrocatalysis.The enhancement of removal rate for p-nitrophenol and COD was around 123% and 278%,respectively.The possible contributions for the synergetic effects were the electrochemically regeneration of ferric ion and the role of the oxygen that formed on the anode.
2002, 13(4): 379-380
Abstract:
A low cost cyanine dye,1,1-dimethyl-3-ethyl-2-[3-(1,3-dihydro-3,3-dimethyl-1-ethyl-5-carboxyl-2H-indol-2-ylidene)-1-propenyl]-1H-benz[e] indolium iodide (1) was synthesized and applied to sensitize mesoporous TiO2 electrode.Photoresponse of the electrode was extended to the visible and remarkably high incident photon-to-current conversion efficiency (IPCE) over 70% was achieved from 500 nm to 600 nm.
A low cost cyanine dye,1,1-dimethyl-3-ethyl-2-[3-(1,3-dihydro-3,3-dimethyl-1-ethyl-5-carboxyl-2H-indol-2-ylidene)-1-propenyl]-1H-benz[e] indolium iodide (1) was synthesized and applied to sensitize mesoporous TiO2 electrode.Photoresponse of the electrode was extended to the visible and remarkably high incident photon-to-current conversion efficiency (IPCE) over 70% was achieved from 500 nm to 600 nm.
2002, 13(4): 381-384
Abstract:
Multi-walled carbon nanotubes were synthesized by the catalytic decomposition of acetylene at 750℃ over sepiolite powder,which was treated with aqueous cobalt nitrate.It is expected that the composite with high specific area will have high capacity of hydrogen storage.
Multi-walled carbon nanotubes were synthesized by the catalytic decomposition of acetylene at 750℃ over sepiolite powder,which was treated with aqueous cobalt nitrate.It is expected that the composite with high specific area will have high capacity of hydrogen storage.
2002, 13(4): 385-388
Abstract:
Nanosized NaY crystals have been prepared from metakaolin and sodium silicate by confined space synthesis with starch additive.It is found that the product has a narrow crystal size distribution (50-100 nm),high Si/Al ratio (Si/Al=4.6-6.1),high surface area (1090 m2/g) and the average diameter of nanosized NaY (75 nm) synthesized is 30 nm,it is smaller than that of without starch additive.
Nanosized NaY crystals have been prepared from metakaolin and sodium silicate by confined space synthesis with starch additive.It is found that the product has a narrow crystal size distribution (50-100 nm),high Si/Al ratio (Si/Al=4.6-6.1),high surface area (1090 m2/g) and the average diameter of nanosized NaY (75 nm) synthesized is 30 nm,it is smaller than that of without starch additive.
2002, 13(4): 389-392
Abstract:
The uniform NiFe2O4 powders with different particle size and morphologies (octahedral,cubic and spherical) have been prepared from different precursors via hydrothermal process.The nanocrystallines derived from precursor B in the weak alkali solution (pH≤10) are superparamagnetic.
The uniform NiFe2O4 powders with different particle size and morphologies (octahedral,cubic and spherical) have been prepared from different precursors via hydrothermal process.The nanocrystallines derived from precursor B in the weak alkali solution (pH≤10) are superparamagnetic.
