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2004 Volume 15 Issue 10
2004, 15(10): 1135-1136
Abstract:
β-Keto-δ-valerolactones, which were obtained by reaction of acetoacetate with aldehydes or ketones, reacted with carbon disulfide, alkyl halides and a new condensation reaction was developed. The structures of the products 3 were confirmed by 1HNMR spectra and elemental analysis.
β-Keto-δ-valerolactones, which were obtained by reaction of acetoacetate with aldehydes or ketones, reacted with carbon disulfide, alkyl halides and a new condensation reaction was developed. The structures of the products 3 were confirmed by 1HNMR spectra and elemental analysis.
2004, 15(10): 1137-1139
Abstract:
Eleven new-typed azo compounds were synthesized in good yields by dehydrogenating the corresponding aryl substituted semicarbazides using potassium ferricyanide and sodium hydroxide system under solid-state conditions.
Eleven new-typed azo compounds were synthesized in good yields by dehydrogenating the corresponding aryl substituted semicarbazides using potassium ferricyanide and sodium hydroxide system under solid-state conditions.
2004, 15(10): 1140-1142
Abstract:
A series of substituted (6-chloropyridine-3-yl)methyl heterocyclic thioether derivatives were prepared by indium mediating in water. The preliminary biological tests showed that compound 3d exhibited good antiviral activity.
A series of substituted (6-chloropyridine-3-yl)methyl heterocyclic thioether derivatives were prepared by indium mediating in water. The preliminary biological tests showed that compound 3d exhibited good antiviral activity.
2004, 15(10): 1143-1145
Abstract:
The disulfides reacted with zinc in DMF, followed by alkyl halides, giving unsymmetrical thioether in excellent yields. This reaction takes place under mild and neutral conditions.
The disulfides reacted with zinc in DMF, followed by alkyl halides, giving unsymmetrical thioether in excellent yields. This reaction takes place under mild and neutral conditions.
2004, 15(10): 1146-1148
Abstract:
An efficient esterification of ferrocenecarboxylic acid with substituted phenols has been achieved using DCC/DMAP protocol in ionic liquids. The corresponding esters are produced in high yields.
An efficient esterification of ferrocenecarboxylic acid with substituted phenols has been achieved using DCC/DMAP protocol in ionic liquids. The corresponding esters are produced in high yields.
2004, 15(10): 1149-1152
Abstract:
A mild and efficient oxidation of alcohols to the corresponding carbonyl compounds using the PhI(OAc)2(1.1 eq.) with n-Bu4NBr (8 mol%) in water at room temperature is described.This new procedure is very simple and affords the desired carbonyl compounds in high yields.
A mild and efficient oxidation of alcohols to the corresponding carbonyl compounds using the PhI(OAc)2(1.1 eq.) with n-Bu4NBr (8 mol%) in water at room temperature is described.This new procedure is very simple and affords the desired carbonyl compounds in high yields.
2004, 15(10): 1153-1156
Abstract:
The compound of tetraacetyldibenzylhexaazaisowurtzitane (TADBIW) is an important precursor of synthesizing the high energetic dense compound of hexanitrohexaazaisowurtzitane (HNIW). We can obtain TADBIW by using hydrogenolysis of hexabenzylhexaazaisowurtzitane (HBIW). In the process of hydrogenolysis of HBIW, it will generate a variety of intermediates, one of them is the compound of triacetyltribenzylhexaazaisowurtzitane (TATBIW). We have synthesized the title compound and prepared its single crystal. In the paper, the crystal and molecular structure of TATBIW·0.5H2O is described. Its crystal belongs to the triclinie and space group P-1. The cell is comprised of two TATBIW and one water molecules. The success of synthesizing TATBIW can help us to research the mechanism of the reduction of HBIW and produce high yields of the end products.
The compound of tetraacetyldibenzylhexaazaisowurtzitane (TADBIW) is an important precursor of synthesizing the high energetic dense compound of hexanitrohexaazaisowurtzitane (HNIW). We can obtain TADBIW by using hydrogenolysis of hexabenzylhexaazaisowurtzitane (HBIW). In the process of hydrogenolysis of HBIW, it will generate a variety of intermediates, one of them is the compound of triacetyltribenzylhexaazaisowurtzitane (TATBIW). We have synthesized the title compound and prepared its single crystal. In the paper, the crystal and molecular structure of TATBIW·0.5H2O is described. Its crystal belongs to the triclinie and space group P-1. The cell is comprised of two TATBIW and one water molecules. The success of synthesizing TATBIW can help us to research the mechanism of the reduction of HBIW and produce high yields of the end products.
2004, 15(10): 1157-1160
Abstract:
(Z)-α-Bromovinylstannanes undergo the cross-coupling reaction with alkynyl iodides in the presence of Pd(PPh3)4 and Cul in THF at room temperature to afford stereoselectively (E)-1, 3-enynyl bromides in good yields
(Z)-α-Bromovinylstannanes undergo the cross-coupling reaction with alkynyl iodides in the presence of Pd(PPh3)4 and Cul in THF at room temperature to afford stereoselectively (E)-1, 3-enynyl bromides in good yields
2004, 15(10): 1161-1163
Abstract:
Two novel polymerizable dyes with anthraquinone residue have been prepared, and their structures were characterized by FTIR, 1HNMR and EA.
Two novel polymerizable dyes with anthraquinone residue have been prepared, and their structures were characterized by FTIR, 1HNMR and EA.
2004, 15(10): 1164-1166
Abstract:
A highly efficient total synthesis of S-(+)-tylophorine has been accomplished in fully asymmetric fashion.
A highly efficient total synthesis of S-(+)-tylophorine has been accomplished in fully asymmetric fashion.
2004, 15(10): 1167-1169
Abstract:
Two N-dichloroacetyl oxazolidines were synthesized with a simple, mild and convenient method. All the compounds were characterized by IR, 1HNMR and elemental analysis. The preliminary biological test showed that the compounds protected maize against injury by some herbicides to some extent.
Two N-dichloroacetyl oxazolidines were synthesized with a simple, mild and convenient method. All the compounds were characterized by IR, 1HNMR and elemental analysis. The preliminary biological test showed that the compounds protected maize against injury by some herbicides to some extent.
2004, 15(10): 1170-1172
Abstract:
Quinoline derivatives were efficiently prepared through acid-catalyzed Friedlander reaction in ionic liquid ([bmim] [BF4]). It is shown that the proposed method is operationally simple and environmentally benign in that the reaction media and the catalyst can be recovered and be reused effectively for at least four times.
Quinoline derivatives were efficiently prepared through acid-catalyzed Friedlander reaction in ionic liquid ([bmim] [BF4]). It is shown that the proposed method is operationally simple and environmentally benign in that the reaction media and the catalyst can be recovered and be reused effectively for at least four times.
2004, 15(10): 1173-1176
Abstract:
Based on the structure-activity relationships of RGD-containing peptides, a series of 1,3-dihydro-1,3-dioxo-2H-isoindole derivatives were synthesized. All of them were first reported.Their structures were confirmed by spectral data and elemental analysis. Their ability to inhibit angiogenesis were evaluated in the chick embryo chorioallantoic membrane assay at 10-5 mol/L.Compounds 5b and 5e displayed obviously antiangiogenic activity.
Based on the structure-activity relationships of RGD-containing peptides, a series of 1,3-dihydro-1,3-dioxo-2H-isoindole derivatives were synthesized. All of them were first reported.Their structures were confirmed by spectral data and elemental analysis. Their ability to inhibit angiogenesis were evaluated in the chick embryo chorioallantoic membrane assay at 10-5 mol/L.Compounds 5b and 5e displayed obviously antiangiogenic activity.
2004, 15(10): 1177-1178
Abstract:
(-)-(5R, 6S)-6-Acetoxyhexadecan-5-olide 1, a natural mosquito attractant pheromone,was synthesized from readily available aldehyde 2 and cyclopentanone 3 using L-proline-catalyzed asymmetric aldol reaction as the key step.
(-)-(5R, 6S)-6-Acetoxyhexadecan-5-olide 1, a natural mosquito attractant pheromone,was synthesized from readily available aldehyde 2 and cyclopentanone 3 using L-proline-catalyzed asymmetric aldol reaction as the key step.
2004, 15(10): 1179-1181
Abstract:
A new triterpene, 25-methylenecyclopholidonyl p-hydroxy-trans-cinnamate, was isolated from a orchid Pholidota yunnanensis. The structure elucidation and 1H, 13C-NMR assignments were achieved by spectral and chemical method.
A new triterpene, 25-methylenecyclopholidonyl p-hydroxy-trans-cinnamate, was isolated from a orchid Pholidota yunnanensis. The structure elucidation and 1H, 13C-NMR assignments were achieved by spectral and chemical method.
2004, 15(10): 1182-1184
Abstract:
A new dihydrochalcone glucoside, vacciniifolin, along with confusoside, trilobatin and sieboldin were isolated from the leaves of Symplocos vacciniifolia. By the method of spectra/analysis, this new compound was elucidated as 2',3,4,4'-tetrahydroxydihydrochalcone 4'-O-β-D-glucopyranoside.
A new dihydrochalcone glucoside, vacciniifolin, along with confusoside, trilobatin and sieboldin were isolated from the leaves of Symplocos vacciniifolia. By the method of spectra/analysis, this new compound was elucidated as 2',3,4,4'-tetrahydroxydihydrochalcone 4'-O-β-D-glucopyranoside.
2004, 15(10): 1185-1186
Abstract:
A new furobenzopyranone, named anaphalisol, was isolated from the whole plant of Anaphalis lactea. Its structure was elucidated by spectroscopic methods including 2D NMR techniques.
A new furobenzopyranone, named anaphalisol, was isolated from the whole plant of Anaphalis lactea. Its structure was elucidated by spectroscopic methods including 2D NMR techniques.
2004, 15(10): 1187-1190
Abstract:
Two new tetranortriterpenoids 3-oxo-24, 25, 26, 27-tetranortirucall-7-ene-23(21)-lactone, 3α-hydroxy-24, 25, 26, 27-tetranortirucall-7-ene-23(21)-lactone were isolated from Amoora dasyclada. Their structures were elucidated by spectroscopic evidences.
Two new tetranortriterpenoids 3-oxo-24, 25, 26, 27-tetranortirucall-7-ene-23(21)-lactone, 3α-hydroxy-24, 25, 26, 27-tetranortirucall-7-ene-23(21)-lactone were isolated from Amoora dasyclada. Their structures were elucidated by spectroscopic evidences.
2004, 15(10): 1191-1194
Abstract:
26-O-β-D-Glucopyranosyl-furost-5(6),20(22)-dien-3β,26-diol 1, a new furostanol saponin, was isolated from the water-extract of Dioscorea nipponica Mak., the raw material of a traditional Chinese herbal medicine Wei Ao Xin. The structure of 1 was determined on the basis of its spectral data especially by NMR spectroscopy. The result provides the first example of naturally occurring furostanol saponins with a single saccharide chain at the C-26 position.
26-O-β-D-Glucopyranosyl-furost-5(6),20(22)-dien-3β,26-diol 1, a new furostanol saponin, was isolated from the water-extract of Dioscorea nipponica Mak., the raw material of a traditional Chinese herbal medicine Wei Ao Xin. The structure of 1 was determined on the basis of its spectral data especially by NMR spectroscopy. The result provides the first example of naturally occurring furostanol saponins with a single saccharide chain at the C-26 position.
2004, 15(10): 1195-1196
Abstract:
From hops of Humulus lupulus, a novel prenylchalcone was isolated, which showed inhibition against BGC-823 cells. The structure was elucidated as 5"-(2"'-hydroxyisopropyl-)-dihydrofurano-[2", 3"-B]-4, 4'-dihydroxy-6'-methoxychalcone, by HRFABMS and NMR spectra.
From hops of Humulus lupulus, a novel prenylchalcone was isolated, which showed inhibition against BGC-823 cells. The structure was elucidated as 5"-(2"'-hydroxyisopropyl-)-dihydrofurano-[2", 3"-B]-4, 4'-dihydroxy-6'-methoxychalcone, by HRFABMS and NMR spectra.
2004, 15(10): 1197-1120
Abstract:
The fluorescence spectra of Quin 2, (2-[(2-bis-[carboxymethyl] amino-5-methylphenoxy)methyl]-6-methoxy-8-bis[carboxymethyl] aminoquiniline), a Ca2+ probe, were investigated upon incubation with Ca2+ or La3+. The results showed that binding of La3+ to Quin 2 resulted in different fluorescent spectrum from that of Ca2+. Based on this observation, a fluorescent method was developed for simultaneously determination of the dissociation rates of Ca2+ and La3+ from a Ca-La-calmodulin complex (Ca2La2CaM).
The fluorescence spectra of Quin 2, (2-[(2-bis-[carboxymethyl] amino-5-methylphenoxy)methyl]-6-methoxy-8-bis[carboxymethyl] aminoquiniline), a Ca2+ probe, were investigated upon incubation with Ca2+ or La3+. The results showed that binding of La3+ to Quin 2 resulted in different fluorescent spectrum from that of Ca2+. Based on this observation, a fluorescent method was developed for simultaneously determination of the dissociation rates of Ca2+ and La3+ from a Ca-La-calmodulin complex (Ca2La2CaM).
2004, 15(10): 1201-1204
Abstract:
Because of the high affinity (KB ≥ 106 L mol-1) between Ru(phen)2(dppz)2+ and DNA, the adding of DNA in the solution of Ru(phen)2(dppz)2+-SDS makes the dissociation of Ru(pben)2(dppz)2+-SDS, and results in decrease of the resonance light scattering (RLS) signals and increase of the absorbance. Based on this, a novel method is proposed for DNA assay.
Because of the high affinity (KB ≥ 106 L mol-1) between Ru(phen)2(dppz)2+ and DNA, the adding of DNA in the solution of Ru(phen)2(dppz)2+-SDS makes the dissociation of Ru(pben)2(dppz)2+-SDS, and results in decrease of the resonance light scattering (RLS) signals and increase of the absorbance. Based on this, a novel method is proposed for DNA assay.
2004, 15(10): 1205-1208
Abstract:
An amphiphilic porphyrin, 5, 10, 15, 20-tetra(4-hydroxyphenyl)-porphyrin (P) was solubilized in SDS micellar solutions. By taking advantage of protonation property of pyridine groups of amphiphilic porphyrin and the UV-Vis spectral sensitivity of Soret band and Q bands to the microenvironment of the porphyrin moiety, two-step protonation was studied in detail by means of UV-Vis spectroscopy. The free base, monocation and dication were described in detail in SDS micellar solution. The possibility of microphase transition was proposed to relate to the observation of two isosbestic points.
An amphiphilic porphyrin, 5, 10, 15, 20-tetra(4-hydroxyphenyl)-porphyrin (P) was solubilized in SDS micellar solutions. By taking advantage of protonation property of pyridine groups of amphiphilic porphyrin and the UV-Vis spectral sensitivity of Soret band and Q bands to the microenvironment of the porphyrin moiety, two-step protonation was studied in detail by means of UV-Vis spectroscopy. The free base, monocation and dication were described in detail in SDS micellar solution. The possibility of microphase transition was proposed to relate to the observation of two isosbestic points.
2004, 15(10): 1209-1211
Abstract:
Enantiomeric separation of epinephrine and salbutamol was investigated by micellar electrokinetic chromatography employing β-cyclodextrin as chiral additive in ammonium chloride-ammonia solution. The analytes were detected by electrochemistry using gold microelectrode at +0.65 V versus SCE reference electrode. The effects of detection potential,concentration of β-cyclodextrin, concentration of sodium dodecyl sulfate, pH value of electrolyte and applied voltage were discussed.
Enantiomeric separation of epinephrine and salbutamol was investigated by micellar electrokinetic chromatography employing β-cyclodextrin as chiral additive in ammonium chloride-ammonia solution. The analytes were detected by electrochemistry using gold microelectrode at +0.65 V versus SCE reference electrode. The effects of detection potential,concentration of β-cyclodextrin, concentration of sodium dodecyl sulfate, pH value of electrolyte and applied voltage were discussed.
2004, 15(10): 1212-1214
Abstract:
Poly(vinyl alcohol) (PVA) fiber mats containing unsaturated heteropoly salt was prepared for the first time. IR, X-ray diffraction and SEM photographs characterized the beaded fiber mats.The viscoelasticity and the conductivity of the solution were the key factors that influence the formation of the beaded fiber mats.
Poly(vinyl alcohol) (PVA) fiber mats containing unsaturated heteropoly salt was prepared for the first time. IR, X-ray diffraction and SEM photographs characterized the beaded fiber mats.The viscoelasticity and the conductivity of the solution were the key factors that influence the formation of the beaded fiber mats.
2004, 15(10): 1215-1218
Abstract:
Spark, stream and corona pulsed high-voltage discharges in water induced by the various initial conductivities have been examined in this paper. The discharge modes changed from spark to corona discharge with the liquid conductivity increasing. The apparent production of OH radical and quantum yield generated by spark discharge in distilled water were 11.57 μmol/L and 0.0978photon/s, respectively. A preliminary study on acid fuchsine (AF) treatment indicated that higher AF removal efficiency has been achieved by spark discharge. The process of degradation showed that the oxidative effects through OH radical oxidation did not play an important role and did increase with the discharge mode changing to spark discharge.
Spark, stream and corona pulsed high-voltage discharges in water induced by the various initial conductivities have been examined in this paper. The discharge modes changed from spark to corona discharge with the liquid conductivity increasing. The apparent production of OH radical and quantum yield generated by spark discharge in distilled water were 11.57 μmol/L and 0.0978photon/s, respectively. A preliminary study on acid fuchsine (AF) treatment indicated that higher AF removal efficiency has been achieved by spark discharge. The process of degradation showed that the oxidative effects through OH radical oxidation did not play an important role and did increase with the discharge mode changing to spark discharge.
2004, 15(10): 1219-1222
Abstract:
4(5),4'(5')-Bis[l-hydroxyalkylbenzo]-21-crown-7 (A-C) have been synthesized by two-step reactions from dibenzo-21-crown-7 (DB21C7). Extraction of cesium cation from nitric acid solutions by A-C has been investigated in nitromethane. Under the conditions of various concentration of HNO3 or NaNO3, the extractabilities of A and B were superior to that of DB21C7.
4(5),4'(5')-Bis[l-hydroxyalkylbenzo]-21-crown-7 (A-C) have been synthesized by two-step reactions from dibenzo-21-crown-7 (DB21C7). Extraction of cesium cation from nitric acid solutions by A-C has been investigated in nitromethane. Under the conditions of various concentration of HNO3 or NaNO3, the extractabilities of A and B were superior to that of DB21C7.
2004, 15(10): 1223-1226
Abstract:
Iron(Ⅱ) tetra-(1,4-dithin)-porphyrazine, (FePz(dtn)4) is able to activate molecule oxygen for oxygenation degradation of rhodamine B (RhB) in an extensive pH region without light excitation. Experiments indicate that the RhB can be degraded nearly 52% in alkaline aqueous solution, bubbling with dioxygen for seven hours in the presence of FePz(dtn)4 and the hydrogen peroxides as an actve intermediate were determined by DPD method. The catalyst is recyclable and the catalyst activity was maintained after l0 recycles.
Iron(Ⅱ) tetra-(1,4-dithin)-porphyrazine, (FePz(dtn)4) is able to activate molecule oxygen for oxygenation degradation of rhodamine B (RhB) in an extensive pH region without light excitation. Experiments indicate that the RhB can be degraded nearly 52% in alkaline aqueous solution, bubbling with dioxygen for seven hours in the presence of FePz(dtn)4 and the hydrogen peroxides as an actve intermediate were determined by DPD method. The catalyst is recyclable and the catalyst activity was maintained after l0 recycles.
2004, 15(10): 1227-1229
Abstract:
Layer-by-layer (LBL) self-assembly method was used to fabricate siliceous ultrathin films by using polyhedral oligomeric silsesquioxanes as building blocks. Ammonium salt of octasilsesquioxane acid (OSi8) and poly(diallyldimethylammonium chloride) (PDDA) were alternately assembled onto CaF2 slide to form nanocomposite multilayers. Linear build-up of the LBL films was confirmed by UV-Vis spectroscopy. IR spectrum suggests existence of OSi8 and PDDA in the LBL films. Atomic force microscopic surface topography of the LBL films indicates the OSi8 covers the entire surface of the topmost layer and shows a granular morphology.
Layer-by-layer (LBL) self-assembly method was used to fabricate siliceous ultrathin films by using polyhedral oligomeric silsesquioxanes as building blocks. Ammonium salt of octasilsesquioxane acid (OSi8) and poly(diallyldimethylammonium chloride) (PDDA) were alternately assembled onto CaF2 slide to form nanocomposite multilayers. Linear build-up of the LBL films was confirmed by UV-Vis spectroscopy. IR spectrum suggests existence of OSi8 and PDDA in the LBL films. Atomic force microscopic surface topography of the LBL films indicates the OSi8 covers the entire surface of the topmost layer and shows a granular morphology.
2004, 15(10): 1230-1232
Abstract:
The NiB amorphous alloy catalysts supported on CNTs and alumina were prepared by impregnation and chemical reduction. The gas-phase benzene hydrogenation was used as a probe reaction to evaluate the catalytic activity. The result showed that the NiB amorphous alloy catalyst supported on carbon nanotubes exhibited higher activity than that supported on alumina.
The NiB amorphous alloy catalysts supported on CNTs and alumina were prepared by impregnation and chemical reduction. The gas-phase benzene hydrogenation was used as a probe reaction to evaluate the catalytic activity. The result showed that the NiB amorphous alloy catalyst supported on carbon nanotubes exhibited higher activity than that supported on alumina.
2004, 15(10): 1233-1236
Abstract:
Highly stable monolayers of 2,9,16,23-tetracarboxyl phthalocyanine on 3-aminopropyl-triethoxysilane (ATS) modified silicon and quartz substrates were prepared by reaction of carboxyl and amine. The monolayers were characterized by UV-Vis spectra and AFM measurements. The results indicated that the ultra-thin films on silicon or quartz were smooth, and the ordered structures were observed in these films.
Highly stable monolayers of 2,9,16,23-tetracarboxyl phthalocyanine on 3-aminopropyl-triethoxysilane (ATS) modified silicon and quartz substrates were prepared by reaction of carboxyl and amine. The monolayers were characterized by UV-Vis spectra and AFM measurements. The results indicated that the ultra-thin films on silicon or quartz were smooth, and the ordered structures were observed in these films.
2004, 15(10): 1237-1240
Abstract:
The aggregates in lysozyme solution with different NaCl concentration were investigated by Atomic Force Microscope (AFM). The AFM images show that there exist lysozyme monomers,n-mers and clusters in lysozyme solution when the conditions are not suitable for crystal growth. In favorable conditions for crystal growth, the lysozyme clusters disappear and almost only monomers exist in solution.
The aggregates in lysozyme solution with different NaCl concentration were investigated by Atomic Force Microscope (AFM). The AFM images show that there exist lysozyme monomers,n-mers and clusters in lysozyme solution when the conditions are not suitable for crystal growth. In favorable conditions for crystal growth, the lysozyme clusters disappear and almost only monomers exist in solution.
2004, 15(10): 1241-1244
Abstract:
Clean liquid oxidation of aldehydes can be accomplished using solid catalyst in the presence of molecular oxygen at room temperature, which is a valuable alternative to traditional counterparts.
Clean liquid oxidation of aldehydes can be accomplished using solid catalyst in the presence of molecular oxygen at room temperature, which is a valuable alternative to traditional counterparts.
2004, 15(10): 1245-1248
Abstract:
Photopromoted methoxycarbonylation of olefins with carbon monoxide can be carried out under ambient conditions with non-precious transition metal complexes (such as cobalt complexes) catalysts in DMF. The isotope experiments show that DMF is decomposed under irradiation and is conveniently used as a carbon monoxide source for the reaction.
Photopromoted methoxycarbonylation of olefins with carbon monoxide can be carried out under ambient conditions with non-precious transition metal complexes (such as cobalt complexes) catalysts in DMF. The isotope experiments show that DMF is decomposed under irradiation and is conveniently used as a carbon monoxide source for the reaction.
2004, 15(10): 1249-1252
Abstract:
Selenium nanoparticles were prepared by a reverse microemulsion system. Sodium selenosulfate was used as selenium source. The results showed that hydrochloric acid concentration and reaction temperature had great influence on the morphology of products. The crystalline selenium nanowires and amorphous selenium nanorods were obtained in given condition.
Selenium nanoparticles were prepared by a reverse microemulsion system. Sodium selenosulfate was used as selenium source. The results showed that hydrochloric acid concentration and reaction temperature had great influence on the morphology of products. The crystalline selenium nanowires and amorphous selenium nanorods were obtained in given condition.
2004, 15(10): 1253-1254
Abstract:
Thermosensitive hydrogels were prepared by graft polymerization of chitosan and N-isopropylacrylamide via 60Co γ-radiation. The effects of monomer concentration and total irradiation dose on percent grafting and grafting efficiency were studied. The thermosensitivity and swelling properties of the hydrogels were investigated.
Thermosensitive hydrogels were prepared by graft polymerization of chitosan and N-isopropylacrylamide via 60Co γ-radiation. The effects of monomer concentration and total irradiation dose on percent grafting and grafting efficiency were studied. The thermosensitivity and swelling properties of the hydrogels were investigated.
2004, 15(10): 1255-1257
Abstract:
The stearic acid nanoparticles loaded polyoxometalate K6[γ-(CpTi)2SiW10O38] [(CpTi)2SiW10] have been prepared and structurally characterized by elemental analysis, IR spectra.The particle size was estimated by transition electron microscope and zatesizer instrument. The result showed that the polyoxometalate retained the parent structure after encapsulation by stearic acid nanoparticles.
The stearic acid nanoparticles loaded polyoxometalate K6[γ-(CpTi)2SiW10O38] [(CpTi)2SiW10] have been prepared and structurally characterized by elemental analysis, IR spectra.The particle size was estimated by transition electron microscope and zatesizer instrument. The result showed that the polyoxometalate retained the parent structure after encapsulation by stearic acid nanoparticles.
2004, 15(10): 1258-1260
Abstract:
A SAPO-11 silicoaluminophosphate molecular sieve with stable crystal structure was synthesized for the first time. After removing template by calcination, its crystal space group still retains Icm2 which the as-synthesized has. The catalyst deriving from the present SAPO-11materials shows higher isomerization selectivity and higher paraffin hydroisomerization yield than those reported elsewhere.
A SAPO-11 silicoaluminophosphate molecular sieve with stable crystal structure was synthesized for the first time. After removing template by calcination, its crystal space group still retains Icm2 which the as-synthesized has. The catalyst deriving from the present SAPO-11materials shows higher isomerization selectivity and higher paraffin hydroisomerization yield than those reported elsewhere.
