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1992 Volume 9 Issue 3
1992, 9(3): 1-6
Abstract:
A brief introduction has been presented to the discovery, laboratory preparation, and structure and spectral characteristics of C60 and C70. The general rule of formation of the closed cage-like fullerenes and their possible applications are also described.
A brief introduction has been presented to the discovery, laboratory preparation, and structure and spectral characteristics of C60 and C70. The general rule of formation of the closed cage-like fullerenes and their possible applications are also described.
1992, 9(3): 7-10
Abstract:
The ring opening copolymerization of D4 (octamethylcyelotetrasiloxane) and D4H (tetramethyleyelotetrasiloxane) was studied. The linear copolymers were obtained using toluene sulfonic acid as catalyst.The micro amounts of H2O presented in reaction system was found to be a chief factor influencing the average molecular weight of the product. The molecular weight of polysiloxane decreased markedly on addition of hexamethyl disiloxane (HMDS). Polysiloxanes with olgooxyethylene side chain which might be used as polymer electrolyte after eomplexing with alkali metal salts were obtained through hydrosilylation of the above mentioned polysiloxane and α-allyl oligooxyethylene ether.
The ring opening copolymerization of D4 (octamethylcyelotetrasiloxane) and D4H (tetramethyleyelotetrasiloxane) was studied. The linear copolymers were obtained using toluene sulfonic acid as catalyst.The micro amounts of H2O presented in reaction system was found to be a chief factor influencing the average molecular weight of the product. The molecular weight of polysiloxane decreased markedly on addition of hexamethyl disiloxane (HMDS). Polysiloxanes with olgooxyethylene side chain which might be used as polymer electrolyte after eomplexing with alkali metal salts were obtained through hydrosilylation of the above mentioned polysiloxane and α-allyl oligooxyethylene ether.
1992, 9(3): 11-14
Abstract:
The catalytic hydrogenation of 4,5-epoxy-2-pentenal on Pd and Ni catalysts has been studied.For Pd catalyst the products obtained were 4,5-epoxypentanal (1) and 2-hydroxytetrahydropyran (2), and for Ni catalyst they were (2) and 1,5-pentadiol (3).The maximum yield of 1,2 and 3 is 58.8%, 62.0% and 84.7%, respectively. The influences of various catalysts on the composition of hydrogenation products were discussed.
The catalytic hydrogenation of 4,5-epoxy-2-pentenal on Pd and Ni catalysts has been studied.For Pd catalyst the products obtained were 4,5-epoxypentanal (1) and 2-hydroxytetrahydropyran (2), and for Ni catalyst they were (2) and 1,5-pentadiol (3).The maximum yield of 1,2 and 3 is 58.8%, 62.0% and 84.7%, respectively. The influences of various catalysts on the composition of hydrogenation products were discussed.
1992, 9(3): 15-19
Abstract:
The characteristics and mechanism of the adsorption of gold in hydrochloric acid medium by impregnated resin N503 N,N-di(sec-octyl) acetamide have been studied. The ratio of gold to N503 in the adsorbate is 1:2. IR and chemical analysis show that the gold is adsorbed in form of AuCl4-. The adsorption is an ion association reaction:2N503+H++AuCl4-=(N503)2·H+·AuCl4- Gold in ores has been seperated and determined by N503 satisfactorily.
The characteristics and mechanism of the adsorption of gold in hydrochloric acid medium by impregnated resin N503 N,N-di(sec-octyl) acetamide have been studied. The ratio of gold to N503 in the adsorbate is 1:2. IR and chemical analysis show that the gold is adsorbed in form of AuCl4-. The adsorption is an ion association reaction:2N503+H++AuCl4-=(N503)2·H+·AuCl4- Gold in ores has been seperated and determined by N503 satisfactorily.
1992, 9(3): 20-25
Abstract:
In this paper, copper(Ⅱ)·tetra-4-(2-methoxyethanoxy-carbonyl) phthalocyanine (A) and copper(Ⅱ)-tetra 4-(2-butoxyethanoxy carbonyl) phthalocyanine (B) were synthesized and characterized by elemental analysis, FT-IR, 1H NMR and ESR. UV-vis spectra indicate that most of them are dimeric compounds in CHCl3 solution. X-ray diffraction patterns of the powder samples showed that the stacking arrangments of the molecules are inter-parallel in the tilted way. Presence of organic substituents in phthalocyanine ring somewhat lowers its thermostability. Surface(π)-area(A) isotherms for both compounds in CHCl3 solution onto subphase(water) at 20℃ showed the existence of the obvious interchange among the "gas", "liquid", "solid" phases and both compounds could form a better monomolecular layer film.
In this paper, copper(Ⅱ)·tetra-4-(2-methoxyethanoxy-carbonyl) phthalocyanine (A) and copper(Ⅱ)-tetra 4-(2-butoxyethanoxy carbonyl) phthalocyanine (B) were synthesized and characterized by elemental analysis, FT-IR, 1H NMR and ESR. UV-vis spectra indicate that most of them are dimeric compounds in CHCl3 solution. X-ray diffraction patterns of the powder samples showed that the stacking arrangments of the molecules are inter-parallel in the tilted way. Presence of organic substituents in phthalocyanine ring somewhat lowers its thermostability. Surface(π)-area(A) isotherms for both compounds in CHCl3 solution onto subphase(water) at 20℃ showed the existence of the obvious interchange among the "gas", "liquid", "solid" phases and both compounds could form a better monomolecular layer film.
1992, 9(3): 26-30
Abstract:
Fume silica-bound poly-4,7-dithianonylsesquisiloxane platinum complex was prepared from 4,7-dithianonyltrimethoxysilane and fume silica via hydrolysis, followed by treatment with potassium chloroplatinite in acetone under Ar atmosphere. The complex exhibited a high catalytic actvity on the hydrosilylation of olefins with triethoxysilane. Even at a molar ratio of olefin to complex of 105, the hydrosilylation reaction took place smoothly with the turnover number more than 80,000.
Fume silica-bound poly-4,7-dithianonylsesquisiloxane platinum complex was prepared from 4,7-dithianonyltrimethoxysilane and fume silica via hydrolysis, followed by treatment with potassium chloroplatinite in acetone under Ar atmosphere. The complex exhibited a high catalytic actvity on the hydrosilylation of olefins with triethoxysilane. Even at a molar ratio of olefin to complex of 105, the hydrosilylation reaction took place smoothly with the turnover number more than 80,000.
1992, 9(3): 31-36
Abstract:
2-Carbonylpropionyl (pyridine-4-formyl) hydrazone (H2PPPH) has been synthesized by a simple method. It is a weak acid, and the complexation was carried out in the water solution of rare earth carbonates. 13 complexes have general composition of RE2(PPFH)3·nH2O (RE=La~Yb, n=2~3). The structures and properties of the complexes were characterized by elemental analysis, IR, UV spectra, TGA-DTA, molar conductance and 1H NMR measuramcnts. Eu2(PPFH)3·3H2O was showed to have a certain antitumor activity.
2-Carbonylpropionyl (pyridine-4-formyl) hydrazone (H2PPPH) has been synthesized by a simple method. It is a weak acid, and the complexation was carried out in the water solution of rare earth carbonates. 13 complexes have general composition of RE2(PPFH)3·nH2O (RE=La~Yb, n=2~3). The structures and properties of the complexes were characterized by elemental analysis, IR, UV spectra, TGA-DTA, molar conductance and 1H NMR measuramcnts. Eu2(PPFH)3·3H2O was showed to have a certain antitumor activity.
1992, 9(3): 37-40
Abstract:
Di and trinuclear manganes(Ⅲ) complexes:Mn2 (Hacala-β)2 (O2CMe)4 and Mn3O(bzalaβ)2(O2CMe)3·4H2O,where Haeala-β- and bzala-β2- are the Schiff base anions prepared by condensing β-alanine with acetylacetone and benzoylaeetone respectively, have been synthesized and studied by electronic conductivity, magnetic susceptibility, thermal analyses, IR and UV-Vis spectra measurements.
Di and trinuclear manganes(Ⅲ) complexes:Mn2 (Hacala-β)2 (O2CMe)4 and Mn3O(bzalaβ)2(O2CMe)3·4H2O,where Haeala-β- and bzala-β2- are the Schiff base anions prepared by condensing β-alanine with acetylacetone and benzoylaeetone respectively, have been synthesized and studied by electronic conductivity, magnetic susceptibility, thermal analyses, IR and UV-Vis spectra measurements.
1992, 9(3): 41-45
Abstract:
The photochromism of some DMF and DMSO coordinated metal decatungstates in DMF DMSO, and acetonitrile has been studied through ESR,1H NMR, risible spectra and W(Ⅴ) determination. The photochromism is found mainly to be related to the decatungstate W10O324-, the ligands coordinated with metal ions and the solvents used.
The photochromism of some DMF and DMSO coordinated metal decatungstates in DMF DMSO, and acetonitrile has been studied through ESR,1H NMR, risible spectra and W(Ⅴ) determination. The photochromism is found mainly to be related to the decatungstate W10O324-, the ligands coordinated with metal ions and the solvents used.
1992, 9(3): 46-48
Abstract:
Poly(propylene carbonate)(PPC)(copolymer of 1,2-epoxypropane and carbon dioxde) was blended with the esters of carboxylated poly(2,6-dimethyl-1,4-phenylene oxide),(E(x)C,PPO).The effects of the degree of substitution and chain length of the substituents in E(x)-CyPPO on the miscibility of PPC/E(x)-CyPPO blends were discussed.The miscibility of the blends is increased with the increase of the content and the chain length of the substitute groups in E(x)-CyPPO;however,the blend is immiscible when the content of substitute groups in E(x)-CyPPO was low and the chain length was short. FTIR data indicated that there is a specific interaction between PPC and E(12)-C32PPO.
Poly(propylene carbonate)(PPC)(copolymer of 1,2-epoxypropane and carbon dioxde) was blended with the esters of carboxylated poly(2,6-dimethyl-1,4-phenylene oxide),(E(x)C,PPO).The effects of the degree of substitution and chain length of the substituents in E(x)-CyPPO on the miscibility of PPC/E(x)-CyPPO blends were discussed.The miscibility of the blends is increased with the increase of the content and the chain length of the substitute groups in E(x)-CyPPO;however,the blend is immiscible when the content of substitute groups in E(x)-CyPPO was low and the chain length was short. FTIR data indicated that there is a specific interaction between PPC and E(12)-C32PPO.
1992, 9(3): 49-53
Abstract:
The electron impact mass spectra of seven new N-substitutive benzimidazole and N-substitutive-2-thiothiazolidone compounds are reported. General fragmentation mechanism has been discussed by using high resolution precise mass determination and linked scan techniques.
The electron impact mass spectra of seven new N-substitutive benzimidazole and N-substitutive-2-thiothiazolidone compounds are reported. General fragmentation mechanism has been discussed by using high resolution precise mass determination and linked scan techniques.
1992, 9(3): 54-57
Abstract:
Study on the use of oscillographic voltemmetric titration with if-E curve in redox reaction is carried out. It is shown that if-E curve shifts in the electrode potential axis at the time when the peak of faradaic current of depolarizer appeasror disapears at the end point of titration.This indication technique is highly sensitive and directly visual.
Study on the use of oscillographic voltemmetric titration with if-E curve in redox reaction is carried out. It is shown that if-E curve shifts in the electrode potential axis at the time when the peak of faradaic current of depolarizer appeasror disapears at the end point of titration.This indication technique is highly sensitive and directly visual.
1992, 9(3): 58-62
Abstract:
An error analysis was made to evaluate the method of estimating number average molecular weight of polymer samples from the intrinsic viscosity and GPC chromatogram[2]. The evaluation was made according to a mcdel chrematogram of normal distribution and the result was in good agreement with that obtained from the real polymer samples.
An error analysis was made to evaluate the method of estimating number average molecular weight of polymer samples from the intrinsic viscosity and GPC chromatogram[2]. The evaluation was made according to a mcdel chrematogram of normal distribution and the result was in good agreement with that obtained from the real polymer samples.
1992, 9(3): 63-65
Abstract:
The corrosion inhibition of quinoline, thiourea and benzyltriphenyl phosphonium bromide for carbon steel in acid medium have been investigated by weight loss method.The following relationship between inhibition coefficient γi (ratio of the corrosion velocity without inhibitor to that with inhibitor) and concentration of inhibitor (Ci) was found:logγi=αi+βilogCi. In the case of mixed inhibitor systems the over all inhibition coeffiieient γ:can be expressed as:logγ3=α3+β3log C1(concentration of the second inhibifor=constant) and logγ3=logγ1+blogγ2(b=β3/β1). When b>1, the inhibitors showed a synergistic inhibition effect.
The corrosion inhibition of quinoline, thiourea and benzyltriphenyl phosphonium bromide for carbon steel in acid medium have been investigated by weight loss method.The following relationship between inhibition coefficient γi (ratio of the corrosion velocity without inhibitor to that with inhibitor) and concentration of inhibitor (Ci) was found:logγi=αi+βilogCi. In the case of mixed inhibitor systems the over all inhibition coeffiieient γ:can be expressed as:logγ3=α3+β3log C1(concentration of the second inhibifor=constant) and logγ3=logγ1+blogγ2(b=β3/β1). When b>1, the inhibitors showed a synergistic inhibition effect.
1992, 9(3): 66-69
Abstract:
The molecular structure of 4,4'-dimethoxy chalcone single crystal has been determined by X-ray diffraction method. The crystals are orthorhombie with space group P212121 and a=5.268(3), b=30.639(8), c=8.652(4)Å, Z=4, V=1396.56Å3 and Dx=1.276g/cm3.The structure was solved by direct mothods and refined by full metrix least squares method to the final R=0.082 for 991 reflections having I≥3σ(I). Being irradiated by 1064nm Nd3+:YIG laser beam 4,4'-dimethoxy chalcone crystal produces a light of 532 nm wavelength.
The molecular structure of 4,4'-dimethoxy chalcone single crystal has been determined by X-ray diffraction method. The crystals are orthorhombie with space group P212121 and a=5.268(3), b=30.639(8), c=8.652(4)Å, Z=4, V=1396.56Å3 and Dx=1.276g/cm3.The structure was solved by direct mothods and refined by full metrix least squares method to the final R=0.082 for 991 reflections having I≥3σ(I). Being irradiated by 1064nm Nd3+:YIG laser beam 4,4'-dimethoxy chalcone crystal produces a light of 532 nm wavelength.
1992, 9(3): 70-71
Abstract:
Tetra-(N,N-dimethylaminophenyl)porphyrin(TDMAPP) reacts with n-C16H33Br to give quaternary bromides of the amphiphilie porphyrin containing four long aliphatic chains. Its Cu, Zn and Co complexes have been prepared. These porphyrins are capable of forming Langmuir-Blodgett films. The UV-Visible spectra of the L-B films as well as of the solid compounds indicate that the interations between molecules in two cases are different.
Tetra-(N,N-dimethylaminophenyl)porphyrin(TDMAPP) reacts with n-C16H33Br to give quaternary bromides of the amphiphilie porphyrin containing four long aliphatic chains. Its Cu, Zn and Co complexes have been prepared. These porphyrins are capable of forming Langmuir-Blodgett films. The UV-Visible spectra of the L-B films as well as of the solid compounds indicate that the interations between molecules in two cases are different.
1992, 9(3): 72-75
Abstract:
Nd(OPri)Cl2 in combination with AlEt3 is a binary lanthanide catalyst of higher activity for the stereospecific polymerization of isoprene. In this paper, the catalytic activity, as well as the microstruture of the polyisoprene are investigated. The experimental results show that it is a highly effective c talyst for the polymerization of isoprene to produce high cis-1,4 polyisoprene. The catalytic activity and the inherent viscosity[η] of the polyisoprene depend greatly on the amount of catalyst, the molar ratio of Al/Nd as well as the polymerization temperature. The cis-1,4 content of the polyisoprenes obtained is over 93% (determined by IR spectra) and the cis-1,4 level depends slightly on the polymerization conditions.
Nd(OPri)Cl2 in combination with AlEt3 is a binary lanthanide catalyst of higher activity for the stereospecific polymerization of isoprene. In this paper, the catalytic activity, as well as the microstruture of the polyisoprene are investigated. The experimental results show that it is a highly effective c talyst for the polymerization of isoprene to produce high cis-1,4 polyisoprene. The catalytic activity and the inherent viscosity[η] of the polyisoprene depend greatly on the amount of catalyst, the molar ratio of Al/Nd as well as the polymerization temperature. The cis-1,4 content of the polyisoprenes obtained is over 93% (determined by IR spectra) and the cis-1,4 level depends slightly on the polymerization conditions.
1992, 9(3): 76-78
Abstract:
Y(acae)3-H2O-Al(i-Bu)3 was used for homopolymerization of epichlorohydrin(ECH) and copolymerization of ECH with propylene oxide(PO) or ethylene oxide(EO). The molecular weight distribution of PECH determined by GPC showed that the number of the active species in the catalyst depends on the method of catalyst preparation. For copolymerization the monomer reactivity ratios obtained by NMR as follows:2.08/0.21 for PO/ECH, 11.9/0.21 for EO/ECH.
Y(acae)3-H2O-Al(i-Bu)3 was used for homopolymerization of epichlorohydrin(ECH) and copolymerization of ECH with propylene oxide(PO) or ethylene oxide(EO). The molecular weight distribution of PECH determined by GPC showed that the number of the active species in the catalyst depends on the method of catalyst preparation. For copolymerization the monomer reactivity ratios obtained by NMR as follows:2.08/0.21 for PO/ECH, 11.9/0.21 for EO/ECH.
1992, 9(3): 79-82
Abstract:
The synthesis of coumarin has been improved with good yield by yarying the adding order of the starting materials and using polyethylene glycol as phase transfer catalyst. Optimum molar ratios were salicylaldehyde:acetic anhydride:potassium acetate=1:3.7:0.5 and salicylaldehyde:acetic anhydride:potassium fluoride=1:3.7:0.35.
The synthesis of coumarin has been improved with good yield by yarying the adding order of the starting materials and using polyethylene glycol as phase transfer catalyst. Optimum molar ratios were salicylaldehyde:acetic anhydride:potassium acetate=1:3.7:0.5 and salicylaldehyde:acetic anhydride:potassium fluoride=1:3.7:0.35.
1992, 9(3): 83-86
Abstract:
Five solid complexes of rare earth with 3-phenyl-5-(furyl-2)pyrazoline dithioformate RE(S2CNC13H11NO)3·nH2O(RE=La, Pr, Nd, Sm, Eu; n=2,4) have been synthesized in dry N2 atmosphere and characterized by elemental analyses, IR spectra, molar con uctance, thermal analyses and fluorescence spectra. The results show that ligands are ccordinated to RE ion through two sulphur atom donors.
Five solid complexes of rare earth with 3-phenyl-5-(furyl-2)pyrazoline dithioformate RE(S2CNC13H11NO)3·nH2O(RE=La, Pr, Nd, Sm, Eu; n=2,4) have been synthesized in dry N2 atmosphere and characterized by elemental analyses, IR spectra, molar con uctance, thermal analyses and fluorescence spectra. The results show that ligands are ccordinated to RE ion through two sulphur atom donors.
1992, 9(3): 87-90
Abstract:
Twenty nonionic surfactants were synthesized from aromatic ethers with 1,3,5-triazine ring and oxirane. The relationship is discussed among the surface activity, latherability, emulsibility, dispersibility, solubilization behavior of the surfactants and the chain lengths of the oxirane segment and hydrophobie groups.
Twenty nonionic surfactants were synthesized from aromatic ethers with 1,3,5-triazine ring and oxirane. The relationship is discussed among the surface activity, latherability, emulsibility, dispersibility, solubilization behavior of the surfactants and the chain lengths of the oxirane segment and hydrophobie groups.
1992, 9(3): 91-93
Abstract:
The surface photovoltaic properties of TPP and its p-phenylsubstituted derivatives as well as metallo derivatives were studied by surface photovoltage spectroscopy(SPS). The results showed that the p-phenylsubstituted groups (-NH2-N(CH3)2,-N+(CH3)3I-) in different degree influenced the surface photovoltaic properties of porphyrins.For-N+(CH3)3I- substituted tetraphenylporphine particularly,the B band in SPS spectra was splitted into two reverse symbolic peaks:-400nm and 469nm. of metalloporpbyrines with FeCl2+,Co2+,Ni2+, Cu2+, and Zn2+, only CuTPP and ZnTPP have the surface photovoltaic property
The surface photovoltaic properties of TPP and its p-phenylsubstituted derivatives as well as metallo derivatives were studied by surface photovoltage spectroscopy(SPS). The results showed that the p-phenylsubstituted groups (-NH2-N(CH3)2,-N+(CH3)3I-) in different degree influenced the surface photovoltaic properties of porphyrins.For-N+(CH3)3I- substituted tetraphenylporphine particularly,the B band in SPS spectra was splitted into two reverse symbolic peaks:-400nm and 469nm. of metalloporpbyrines with FeCl2+,Co2+,Ni2+, Cu2+, and Zn2+, only CuTPP and ZnTPP have the surface photovoltaic property
1992, 9(3): 94-96
Abstract:
PTMSP membranes were modified by plasma technigue in the presence of hexamethyldisiloxane.The oxygen permeation rate Po2 and oxygen-nitrogen separation coefficient α(O2)/N2 of the modified membranes were 1590 barrer and 3.16, respectively.
PTMSP membranes were modified by plasma technigue in the presence of hexamethyldisiloxane.The oxygen permeation rate Po2 and oxygen-nitrogen separation coefficient α(O2)/N2 of the modified membranes were 1590 barrer and 3.16, respectively.
1992, 9(3): 97-99
Abstract:
The catalytic activities of two catalysts, (W3O2(CH3COO)6(H2O)3) Br·2H2O and (W2MoO2(CH3COO)6(H2O)3)Er·2H2O in the oxidation of styrene have been studied. The results showed that these two clusters have better catalytic properties than those given by Irclco(pph3)2 and Rhcl(pph3)2. The catalysts can be used repeatly without change in their structure and activities.
The catalytic activities of two catalysts, (W3O2(CH3COO)6(H2O)3) Br·2H2O and (W2MoO2(CH3COO)6(H2O)3)Er·2H2O in the oxidation of styrene have been studied. The results showed that these two clusters have better catalytic properties than those given by Irclco(pph3)2 and Rhcl(pph3)2. The catalysts can be used repeatly without change in their structure and activities.
1992, 9(3): 100-101
Abstract:
The benzylation of diphenylamine was successfully performed in the presence of KFalumina as catalyst.The optimum conditions are diphenylamine:benzyl choride:KF-alumina=1:1.2:0.5(moi ar ratio),DMF as solvent,160±1℃,14h.Yield 88.4%.
The benzylation of diphenylamine was successfully performed in the presence of KFalumina as catalyst.The optimum conditions are diphenylamine:benzyl choride:KF-alumina=1:1.2:0.5(moi ar ratio),DMF as solvent,160±1℃,14h.Yield 88.4%.
1992, 9(3): 102-105
Abstract:
Cu(Salad)2, Cu(gly)2H2O, Cu(o-NH2C6H4CO2)2, Cu(ClO4)26H2O, Cu(CH3CN)4ClO4 were use first time for catalyzing cyclopropanation of ethyl diazoaeetate (EDA) with tetramethyl ethylene (TME). Cu(Ⅱ) amino acid salts showed no catalytic activity, when they were used directly. High catalytic activity appeared only cohen they were pre-reduccd to Cu(Ⅰ) High TME/EDA ratio, high EDA/Cat ratio, longer addition period of EDA-TME mixture, and high reaction temperature benefited the product yield. Cu(salad)2 and Cu(gly)2H2O showed higher catalytic efficiency for the reaction under suitable conditions.
Cu(Salad)2, Cu(gly)2H2O, Cu(o-NH2C6H4CO2)2, Cu(ClO4)26H2O, Cu(CH3CN)4ClO4 were use first time for catalyzing cyclopropanation of ethyl diazoaeetate (EDA) with tetramethyl ethylene (TME). Cu(Ⅱ) amino acid salts showed no catalytic activity, when they were used directly. High catalytic activity appeared only cohen they were pre-reduccd to Cu(Ⅰ) High TME/EDA ratio, high EDA/Cat ratio, longer addition period of EDA-TME mixture, and high reaction temperature benefited the product yield. Cu(salad)2 and Cu(gly)2H2O showed higher catalytic efficiency for the reaction under suitable conditions.
1992, 9(3): 106-109
Abstract:
A novel sensitive dye bis(6-bromo-N-ethylphenothiazine-3-yl)toluene-iodide was synthesized. Its structure has been verified by IR, NMR, MS and elemental analysis. The dye. showed a high sensivity to poly-N-vinylcarbazole and gave an absorbility at 780~900 nm.
A novel sensitive dye bis(6-bromo-N-ethylphenothiazine-3-yl)toluene-iodide was synthesized. Its structure has been verified by IR, NMR, MS and elemental analysis. The dye. showed a high sensivity to poly-N-vinylcarbazole and gave an absorbility at 780~900 nm.
1992, 9(3): 110-113
Abstract:
Thirteen new compounds of type (RCp)M(S2CNR2)3 were synthesized by reacting (RCp)2MCl2(R=H, Me;M=Ti(Ⅳ), Zr(Ⅳ)) with sodium pyrrolidine-, piperidine- and morpholine-dithiocarbamates, respectively. The IR spectra showed that the dithiocarhamic ligands behave as bidentate ligands in the complexes. The 1H-NMR spectra showed that all complexes are rigid compounds.
Thirteen new compounds of type (RCp)M(S2CNR2)3 were synthesized by reacting (RCp)2MCl2(R=H, Me;M=Ti(Ⅳ), Zr(Ⅳ)) with sodium pyrrolidine-, piperidine- and morpholine-dithiocarbamates, respectively. The IR spectra showed that the dithiocarhamic ligands behave as bidentate ligands in the complexes. The 1H-NMR spectra showed that all complexes are rigid compounds.
1992, 9(3): 114-117
Abstract:
The reaction kinetics of CDDP (cisplatin), CEDCA (carboplatin) with guanosine and L-Met are compared by means of HPLC.The results show that the reaction rate of CDDP with Guo is greater than that with CBDCA. However, CBDCA gave more 1:2 products with Guo than 1:1 products and its second hydrolysis rate constant k2 is much greater than its first one k1.For reactions of CDDP and CBDCA with L-Met the second rate constants are measured as 36.1×10-3 and 5.0×10-3M-1S-1, respectively. This may be one of the reasons that CBDCA shows less nephrotoxicity than CBDP.
The reaction kinetics of CDDP (cisplatin), CEDCA (carboplatin) with guanosine and L-Met are compared by means of HPLC.The results show that the reaction rate of CDDP with Guo is greater than that with CBDCA. However, CBDCA gave more 1:2 products with Guo than 1:1 products and its second hydrolysis rate constant k2 is much greater than its first one k1.For reactions of CDDP and CBDCA with L-Met the second rate constants are measured as 36.1×10-3 and 5.0×10-3M-1S-1, respectively. This may be one of the reasons that CBDCA shows less nephrotoxicity than CBDP.
