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2003 Volume 14 Issue 2
2003, 14(2): 111-114
Abstract:
Triphenylpyridinium ylid 2, generated by the decarboxylation of betaine 1, were noted to react with acetyl chloride, chloroform or acetone to form addition-elimination product and proton extraction-carbanion addition products, respectively.The reaction with chloroform was determined as pseudo first order from kinetic experiments.The values of kobsd and t1/2 for decarboxylation at 20, 40 and 50℃ were calculated to be 4.6×10-4, 8.8×10-3, 2.8×10-2min-1 and 1.5×103, 78, 24 minutes, respectively.
Triphenylpyridinium ylid 2, generated by the decarboxylation of betaine 1, were noted to react with acetyl chloride, chloroform or acetone to form addition-elimination product and proton extraction-carbanion addition products, respectively.The reaction with chloroform was determined as pseudo first order from kinetic experiments.The values of kobsd and t1/2 for decarboxylation at 20, 40 and 50℃ were calculated to be 4.6×10-4, 8.8×10-3, 2.8×10-2min-1 and 1.5×103, 78, 24 minutes, respectively.
2003, 14(2): 115-117
Abstract:
A mild and highly efficient synthesis of C7-C14 and C15-C21 fragments of epothilone B and D is described in which racemic C7-C14 fragment is prepared from nerol through four steps, and C15-C21 fragment is obtained from 1, 3-dichloroacetone, thioacetamide and propionaldehyde.
A mild and highly efficient synthesis of C7-C14 and C15-C21 fragments of epothilone B and D is described in which racemic C7-C14 fragment is prepared from nerol through four steps, and C15-C21 fragment is obtained from 1, 3-dichloroacetone, thioacetamide and propionaldehyde.
2003, 14(2): 118-120
Abstract:
A series of disperse dyes bearing ether groups have been synthesized.The visible absorption spectra of them were studied, their fastness on polyester microfibres were investigated.
A series of disperse dyes bearing ether groups have been synthesized.The visible absorption spectra of them were studied, their fastness on polyester microfibres were investigated.
2003, 14(2): 121-124
Abstract:
In this paper, we report that diisopropyl phosphoryl amino acid could be prepared with reasonable yields under solvent-free condition by adding amino acid to the mixture of diisopropyl phosphite and N-chlorodiisopropylamine.
In this paper, we report that diisopropyl phosphoryl amino acid could be prepared with reasonable yields under solvent-free condition by adding amino acid to the mixture of diisopropyl phosphite and N-chlorodiisopropylamine.
2003, 14(2): 125-126
Abstract:
New chiral C2-symmetrical bis(oxazoline) compounds bearing one isobutyl-, secbutyl-, benzyl- or isopropyl-substituent at the 4-position have been prepared and characterized.
New chiral C2-symmetrical bis(oxazoline) compounds bearing one isobutyl-, secbutyl-, benzyl- or isopropyl-substituent at the 4-position have been prepared and characterized.
2003, 14(2): 127-129
Abstract:
The racemic neocnidilide has been synthesized by stereoselective reaction of hemiacetal 5 with n-BuMgBr.
The racemic neocnidilide has been synthesized by stereoselective reaction of hemiacetal 5 with n-BuMgBr.
2003, 14(2): 130-132
Abstract:
The structure of syn- and anti-Nb-(p-toluenesulfonyl)-3a-hydroxyl-1, 2, 3, 3a, 8, 8a-hexahydro pyrrolo[2,3-b] indole-2-carboxylic t-butyl ester was stereoselectively synthesized by oxidative ring formation of Nb-(p-toluenesulfonyl)-L-tryptophan t-butyl ester in methylene chloride containing dimethyldioxirane (DMDO), the p-toluenesulfonyl group and t-butyl group can be easily removed by sodium naphthalenide and trifluoroacetic acid, respectively.
The structure of syn- and anti-Nb-(p-toluenesulfonyl)-3a-hydroxyl-1, 2, 3, 3a, 8, 8a-hexahydro pyrrolo[2,3-b] indole-2-carboxylic t-butyl ester was stereoselectively synthesized by oxidative ring formation of Nb-(p-toluenesulfonyl)-L-tryptophan t-butyl ester in methylene chloride containing dimethyldioxirane (DMDO), the p-toluenesulfonyl group and t-butyl group can be easily removed by sodium naphthalenide and trifluoroacetic acid, respectively.
2003, 14(2): 133-134
Abstract:
N-(2,4-Dinitrophenyl)-4-amino-n-butyl aldehyde 3 was obtained with high yield of 80% when N-(2,4-dinitrophenyl)-L-proline 1 reacted with SOCl2 at room temperature.However, the anticipated product N-(2,4-dinitrophenyl)-tetrahydropyrrolyl-2-(4-methylthiophenyl) ketone 2 did not be produced.The mechanism was discussed in this article.
N-(2,4-Dinitrophenyl)-4-amino-n-butyl aldehyde 3 was obtained with high yield of 80% when N-(2,4-dinitrophenyl)-L-proline 1 reacted with SOCl2 at room temperature.However, the anticipated product N-(2,4-dinitrophenyl)-tetrahydropyrrolyl-2-(4-methylthiophenyl) ketone 2 did not be produced.The mechanism was discussed in this article.
2003, 14(2): 135-137
Abstract:
The catalytic properties of a scries of cobalt complexes containing bidenated ligand for displacement reaction of trialkylaluminum with ethylene is reported. Effect of different reaction time, temperature and cobalt complexes containing different ligand on catalyst performance has been investigated.
The catalytic properties of a scries of cobalt complexes containing bidenated ligand for displacement reaction of trialkylaluminum with ethylene is reported. Effect of different reaction time, temperature and cobalt complexes containing different ligand on catalyst performance has been investigated.
2003, 14(2): 138-140
Abstract:
Several new chiral organogallium and indium complexes with chiral Salen (1 and 2) as anxciliary ligands have been synthesized and characterized by elemental analysis, IR, 1H NMR and Mass spectroscopy.For the gallium, mono and bimetallic complexes were obtained, whereas ring closure complexes of indium were obtained.
Several new chiral organogallium and indium complexes with chiral Salen (1 and 2) as anxciliary ligands have been synthesized and characterized by elemental analysis, IR, 1H NMR and Mass spectroscopy.For the gallium, mono and bimetallic complexes were obtained, whereas ring closure complexes of indium were obtained.
2003, 14(2): 141-142
Abstract:
The atom transfer radical polymerization(ATRP) of (-)-menthyl methacrylate((-)-MnMA) mediated by CuCl/bipyridine and ethyl 2-bromopropionate or 1-phenylethyl bromide in THF system has been studied.The dependence of the specific rotation on molecular weight and the CD of Poly((-)-MnMA) thus obtained was investigated.
The atom transfer radical polymerization(ATRP) of (-)-menthyl methacrylate((-)-MnMA) mediated by CuCl/bipyridine and ethyl 2-bromopropionate or 1-phenylethyl bromide in THF system has been studied.The dependence of the specific rotation on molecular weight and the CD of Poly((-)-MnMA) thus obtained was investigated.
2003, 14(2): 143-144
Abstract:
A bisphosphate-bridged tetrahomodioxacalix[6]arene with a C2v symmetry at the ambient temperature was obtained by the reaction of tetrahomodioxacalix[6]arene with POCl3.
A bisphosphate-bridged tetrahomodioxacalix[6]arene with a C2v symmetry at the ambient temperature was obtained by the reaction of tetrahomodioxacalix[6]arene with POCl3.
2003, 14(2): 145-146
Abstract:
A new monomer of 4, 4'-biphenyl-bis[4-phthalazin-1(2H)-one] was synthesized from biphenyl and phthalic anhydride, and a novel copoly(aryl ether ketone) (PPEK) was synthesized from 2, 2-bis(4-hydroxyphenyl)-propane (BPA), 4, 4'-biphenyl-bis-[4-phthalazin-1(2H)-one], 4, 4'- difluorodiphenylketone (DFK).The monomer and copolymer were characterized by FT-IR and 1H-NMR.DSC and TGA were used to the novel polymer.
A new monomer of 4, 4'-biphenyl-bis[4-phthalazin-1(2H)-one] was synthesized from biphenyl and phthalic anhydride, and a novel copoly(aryl ether ketone) (PPEK) was synthesized from 2, 2-bis(4-hydroxyphenyl)-propane (BPA), 4, 4'-biphenyl-bis-[4-phthalazin-1(2H)-one], 4, 4'- difluorodiphenylketone (DFK).The monomer and copolymer were characterized by FT-IR and 1H-NMR.DSC and TGA were used to the novel polymer.
2003, 14(2): 147-150
Abstract:
The synthesis of a new N,19-seco norditerpenoid alkaloid 7 bearing nitro group from yunaconitine 1 as the starting material through a series of steps was described.
The synthesis of a new N,19-seco norditerpenoid alkaloid 7 bearing nitro group from yunaconitine 1 as the starting material through a series of steps was described.
2003, 14(2): 151-154
Abstract:
In this work, a novel sugar-containing copolymer was synthesized by the copolymerization of α-allyl glucoside (AG) with acrylonitrile (AN).The copolymers were characterized by NMR spectroscopy.It was found that acrylonitrile-based copolymers containing as high as 22wt.% of α-allyl glucoside can be synthesized by the free radical solution copolymerization of the two monomers in DMSO with AIBN as initiator.
In this work, a novel sugar-containing copolymer was synthesized by the copolymerization of α-allyl glucoside (AG) with acrylonitrile (AN).The copolymers were characterized by NMR spectroscopy.It was found that acrylonitrile-based copolymers containing as high as 22wt.% of α-allyl glucoside can be synthesized by the free radical solution copolymerization of the two monomers in DMSO with AIBN as initiator.
2003, 14(2): 155-158
Abstract:
An inclusion complex of β-cyclodextrin with andrographolide (Andro) was prepared by using a convenient method of microwave irradiation.The structure of the inclusion complex was determined by the 1H NMR, 2D NMR spectroscopy as well as the elemental analysis.
An inclusion complex of β-cyclodextrin with andrographolide (Andro) was prepared by using a convenient method of microwave irradiation.The structure of the inclusion complex was determined by the 1H NMR, 2D NMR spectroscopy as well as the elemental analysis.
2003, 14(2): 159-162
Abstract:
A few of p-nitrobenzoates were synthesized, and the electron transfer of them with β-N, N-dimethylaminonaphthalene (DMAN) in methanol solution was studied.Steady-state fluore-scence results showed the cyclodextrin moiety in p-nitrobenzoyl-β-cyclodextrin would block the electron transfer pathway from DMAN compared with other electron acceptors, thus, reduced the electron transfer efficiency
A few of p-nitrobenzoates were synthesized, and the electron transfer of them with β-N, N-dimethylaminonaphthalene (DMAN) in methanol solution was studied.Steady-state fluore-scence results showed the cyclodextrin moiety in p-nitrobenzoyl-β-cyclodextrin would block the electron transfer pathway from DMAN compared with other electron acceptors, thus, reduced the electron transfer efficiency
2003, 14(2): 163-166
Abstract:
The synthesis of acyclovir and L-ascorbic acid with divinyladipate was performed with alkaline protease from Bacillus subtilis and lipase from Lipozyme (immobilized from Mucor miehei) in different anhydrous organic solvents.Two corresponding derivatives were obtained.
The synthesis of acyclovir and L-ascorbic acid with divinyladipate was performed with alkaline protease from Bacillus subtilis and lipase from Lipozyme (immobilized from Mucor miehei) in different anhydrous organic solvents.Two corresponding derivatives were obtained.
2003, 14(2): 167-168
Abstract:
The enzymatic synthesis of CCK-8 tripeptide derivative Phac-Met-Asp(OMe)-Phe-NH2 is reported.Starting with Phac-Met-OCam, we have successfully synthesized the target tripeptide with three free or immobilized enzymes, α-chymotrypsin, papain and thermolysin in reasonable yields.The key steps in this synthesis were the coupling of Phac-Met-OCam and H-Asp(OMe)2 to form Met-Asp peptide bond catalyzed by α-chymotrypsin and the selective hydrolysis of α-ester of Phac-Met-Asp(OMe)2 catalyzed by papain.
The enzymatic synthesis of CCK-8 tripeptide derivative Phac-Met-Asp(OMe)-Phe-NH2 is reported.Starting with Phac-Met-OCam, we have successfully synthesized the target tripeptide with three free or immobilized enzymes, α-chymotrypsin, papain and thermolysin in reasonable yields.The key steps in this synthesis were the coupling of Phac-Met-OCam and H-Asp(OMe)2 to form Met-Asp peptide bond catalyzed by α-chymotrypsin and the selective hydrolysis of α-ester of Phac-Met-Asp(OMe)2 catalyzed by papain.
2003, 14(2): 169-172
Abstract:
Two new compounds, oleanolic acid 28-O-β-D-glucopyranosyl-3-O-α-L-arabinopyrano- syl-(1→3)-(6'-butyl ester)-β-D-glucuropyranoside 1, oleanolic acid 28-O-β-D-glucopyranosyl- (1→6)-β-D-glucopyranoside 2 have been isolated from the roots of Hemsleya penxianensis var.Gulinensis.Their structures were determined on the bases of the spectral and chemical evidences.
Two new compounds, oleanolic acid 28-O-β-D-glucopyranosyl-3-O-α-L-arabinopyrano- syl-(1→3)-(6'-butyl ester)-β-D-glucuropyranoside 1, oleanolic acid 28-O-β-D-glucopyranosyl- (1→6)-β-D-glucopyranoside 2 have been isolated from the roots of Hemsleya penxianensis var.Gulinensis.Their structures were determined on the bases of the spectral and chemical evidences.
2003, 14(2): 173-175
Abstract:
A novel alkaloid was isolated from the stems and leaves of Stemona parviflora Wright.Based on the spectral methods, its structure was elucidated as parvineostemonine.
A novel alkaloid was isolated from the stems and leaves of Stemona parviflora Wright.Based on the spectral methods, its structure was elucidated as parvineostemonine.
2003, 14(2): 176-178
Abstract:
A new steroid named as Zhonghualiaoine I (1) was isolated from Polygonum nodosum Pers (Chinese name "Zhonghualiao", Berberidaceae).Its structure was deduced on the basis of its spectral data.
A new steroid named as Zhonghualiaoine I (1) was isolated from Polygonum nodosum Pers (Chinese name "Zhonghualiao", Berberidaceae).Its structure was deduced on the basis of its spectral data.
2003, 14(2): 179-180
Abstract:
A new flavonol glycoside, isorhamnetin-3-O-β-D-xyloside, was isolated from the extract of leaves and twigs of Alchornea davidii (Euphorbiaceae).Its structure was established on the basis of the spectral analysis and chemical degradation.Antimicrobial assay showed that it moderately inhibited the growth of test bacteria (Staphylococcus aureus, Bacillus subtilis and Pseudomonas fluorescens) and fungi (Candida albicans, Aspergillus niger and Trichophyton rubrum) with MICs at 50 μg/Ml.
A new flavonol glycoside, isorhamnetin-3-O-β-D-xyloside, was isolated from the extract of leaves and twigs of Alchornea davidii (Euphorbiaceae).Its structure was established on the basis of the spectral analysis and chemical degradation.Antimicrobial assay showed that it moderately inhibited the growth of test bacteria (Staphylococcus aureus, Bacillus subtilis and Pseudomonas fluorescens) and fungi (Candida albicans, Aspergillus niger and Trichophyton rubrum) with MICs at 50 μg/Ml.
2003, 14(2): 181-184
Abstract:
A novel stochastic resonance algorithm was employed to enhance the signal-to-noise ratio (SNR) of signals of analytical chemistry.By using a gas chromatographic data set, it was proven that the SNR was greatly improved and the quantitative relationship between concentrations and chromatographic responses remained simultaneously.The linear range was extended beyond the instrumental detection limit.
A novel stochastic resonance algorithm was employed to enhance the signal-to-noise ratio (SNR) of signals of analytical chemistry.By using a gas chromatographic data set, it was proven that the SNR was greatly improved and the quantitative relationship between concentrations and chromatographic responses remained simultaneously.The linear range was extended beyond the instrumental detection limit.
2003, 14(2): 185-187
Abstract:
A novel chemiluminescence detection scheme has been developed for detecting water-soluble vitamins following capillary electrophoresis (CE) separation.This detection was based on the inhibitory effect of vitamins on the CL reaction between luminol and BrO- in basic aqueous solution.Detection of vitamins was accomplished with a borate-based background electrolyte at pH 9.2.The luminol was used as a component of the separation carrier electrolyte.
A novel chemiluminescence detection scheme has been developed for detecting water-soluble vitamins following capillary electrophoresis (CE) separation.This detection was based on the inhibitory effect of vitamins on the CL reaction between luminol and BrO- in basic aqueous solution.Detection of vitamins was accomplished with a borate-based background electrolyte at pH 9.2.The luminol was used as a component of the separation carrier electrolyte.
2003, 14(2): 188-190
Abstract:
Two polymeric complexes,[Cd(BTP)2]n,1 and [Cd(i-BTP)2]n 2 ,were prepared and invesigted by solid 31P and 113Cd NMR spectroscopies.The crystal structure of 2 was determined by X-ray diffraction.
Two polymeric complexes,[Cd(BTP)2]n,1 and [Cd(i-BTP)2]n 2 ,were prepared and invesigted by solid 31P and 113Cd NMR spectroscopies.The crystal structure of 2 was determined by X-ray diffraction.
2003, 14(2): 191-194
Abstract:
The coupling of capillary electrophoresis to electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)was presented for the on-line separation and detection of mixture of peptides.With the ultra-high resolution and unmatchable mass measurement accuacy FT-ICR-MS provides,the separation and identification of angiotensin Ⅲ,octreotide and elastin chemotactic were successfully achieved using this fabricated device,which showed its great application potential in detection and structural identification for multicomponent sample.
The coupling of capillary electrophoresis to electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)was presented for the on-line separation and detection of mixture of peptides.With the ultra-high resolution and unmatchable mass measurement accuacy FT-ICR-MS provides,the separation and identification of angiotensin Ⅲ,octreotide and elastin chemotactic were successfully achieved using this fabricated device,which showed its great application potential in detection and structural identification for multicomponent sample.
2003, 14(2): 195-196
Abstract:
With introduction of a diisopropyloxy phosphoryl group into the N terminal of amino acids, it was found that proton affinity (PA) of amino acid was enhanced in mass spectrometry.Density functional theory calculations showed that the energy for protonation of DIPP-amino acid is lower than that of amino acid, which means PA of DIPP-AA is higher than that of corresponding amino acid.These results, coincident with our empirical results, offer a useful interpretation of experimental observations.
With introduction of a diisopropyloxy phosphoryl group into the N terminal of amino acids, it was found that proton affinity (PA) of amino acid was enhanced in mass spectrometry.Density functional theory calculations showed that the energy for protonation of DIPP-amino acid is lower than that of amino acid, which means PA of DIPP-AA is higher than that of corresponding amino acid.These results, coincident with our empirical results, offer a useful interpretation of experimental observations.
2003, 14(2): 197-200
Abstract:
A new ionic conductor La2-xNdxMo209，(x=0.0-2.0) has been synthesized by wet-chcmistry method. The precursors and the resultant oxide powders were characterized by DTA/IG, DSC, XRD and XPS techniques. Eflect ofsubslituting Nd for La reveals thal the phase transition which occurs in La2Mo209 around 565℃ disappears when x>0.2. And The maximum amount of Nd stabilized the high temperature phase of β-La2Mo2O9 from cubic to tetragonal is about x=1.6.The measurements of impedance spectroscopy indicate that the ionic conductivity becomes considerably higher in comparison to that of La2Mo2O9.
A new ionic conductor La2-xNdxMo209，(x=0.0-2.0) has been synthesized by wet-chcmistry method. The precursors and the resultant oxide powders were characterized by DTA/IG, DSC, XRD and XPS techniques. Eflect ofsubslituting Nd for La reveals thal the phase transition which occurs in La2Mo209 around 565℃ disappears when x>0.2. And The maximum amount of Nd stabilized the high temperature phase of β-La2Mo2O9 from cubic to tetragonal is about x=1.6.The measurements of impedance spectroscopy indicate that the ionic conductivity becomes considerably higher in comparison to that of La2Mo2O9.
2003, 14(2): 201-204
Abstract:
Electrosorption of oxygen and CO on Ru(0001) surface were investigated by ex-situ electron diffraction (LEED/RHEED), AES and electrochemical data.The Ru(0001) surface exhibited a strongly affinity for oxygen which gave preference to form a (2×2)-O phase.However, anodization of Ru(0001) electrode produced a (1×1)-O phase.A coadsorption structure (2CO+O)(2×2)/Ru(0001) was performed from electrosorption of CO on Ru(0001) surface in electrolyte solution.
Electrosorption of oxygen and CO on Ru(0001) surface were investigated by ex-situ electron diffraction (LEED/RHEED), AES and electrochemical data.The Ru(0001) surface exhibited a strongly affinity for oxygen which gave preference to form a (2×2)-O phase.However, anodization of Ru(0001) electrode produced a (1×1)-O phase.A coadsorption structure (2CO+O)(2×2)/Ru(0001) was performed from electrosorption of CO on Ru(0001) surface in electrolyte solution.
2003, 14(2): 205-208
Abstract:
Polychlorinated biphenyl (PCB) is a kind of persistent and dangerous environmental pollutants.This paper presented the research result of sonochemical degradation of 2-chloro- biphenyl (2-CBP), 4-chlorobiphenyl (4-CBP) and 4,4'-dichlorobiphenyl (4,4'-CBP)in water.The ultrasonic degradation kinetics of 2-CBP, 4-CBP and 4,4'-CBP in water were found to be first-order and the degradation rate coefficients are 3.69×10-2, 3.19×10-2 and 2.06×10-2 at 25±1℃ for 2-CBP, 4-CBP and 4,4'-CBP respectively.The influence of initial concentrations, reaction temperature on the ultrasonic decomposition of 2-CBP were also investigated.
Polychlorinated biphenyl (PCB) is a kind of persistent and dangerous environmental pollutants.This paper presented the research result of sonochemical degradation of 2-chloro- biphenyl (2-CBP), 4-chlorobiphenyl (4-CBP) and 4,4'-dichlorobiphenyl (4,4'-CBP)in water.The ultrasonic degradation kinetics of 2-CBP, 4-CBP and 4,4'-CBP in water were found to be first-order and the degradation rate coefficients are 3.69×10-2, 3.19×10-2 and 2.06×10-2 at 25±1℃ for 2-CBP, 4-CBP and 4,4'-CBP respectively.The influence of initial concentrations, reaction temperature on the ultrasonic decomposition of 2-CBP were also investigated.
2003, 14(2): 209-212
Abstract:
Density functional theory (DFT) at B3LYP/6-31G(d,p) level was employed to calculate intramolecular hydrogen bond enthalpies (HIHB), O-H charge differences, O-H bond lengths and bond orders for various substituted catechols and their radicals generated after H-abstraction.It was found that although the charge difference between hydrogen-bonded H and O played a role in determining HIHB, HIHB was mainly governed by the hydrogen bond length.As the oxygen-centered radical has great tendency to form a chemical bond with the H atom, hydrogen bond lengths in catecholic radicals are systematically shorter than those in catechols.Hence, the HIHB for the former are higher than those for the latter.
Density functional theory (DFT) at B3LYP/6-31G(d,p) level was employed to calculate intramolecular hydrogen bond enthalpies (HIHB), O-H charge differences, O-H bond lengths and bond orders for various substituted catechols and their radicals generated after H-abstraction.It was found that although the charge difference between hydrogen-bonded H and O played a role in determining HIHB, HIHB was mainly governed by the hydrogen bond length.As the oxygen-centered radical has great tendency to form a chemical bond with the H atom, hydrogen bond lengths in catecholic radicals are systematically shorter than those in catechols.Hence, the HIHB for the former are higher than those for the latter.
2003, 14(2): 213-216
Abstract:
The structure of eight-carbon monolayers on the H-terminated Si(Ⅲ) surface was investigated by molecular simulation method.The best substitution percent 50% for octene or octyne-derived monolayer can be obtained using molecular mechanics calculation.And the densely packed, well-ordered monolayer on Si(Ⅲ) surface can be shown through energy minimization in the suitable-size simulation cell.
The structure of eight-carbon monolayers on the H-terminated Si(Ⅲ) surface was investigated by molecular simulation method.The best substitution percent 50% for octene or octyne-derived monolayer can be obtained using molecular mechanics calculation.And the densely packed, well-ordered monolayer on Si(Ⅲ) surface can be shown through energy minimization in the suitable-size simulation cell.
2003, 14(2): 217-218
Abstract:
The speciation and distribution of Gd(Ⅲ) in human interstitial fluid was studied by computer simulation.Meantime artificial neural network was applied to the estimation of log β values of complexes.The results show that the precipitate species, GdPO4 and Gd2(CO3)3, are the predominant species.Among soluble species, the free Gd(Ⅲ), [Gd(HSA)] , [Gd(Ox)] and then the ternary complexes of Gd(Ⅲ) with citrate are main species and [Gd3(OH)4] becomes the predominant species at the Gd(Ⅲ) total concentration of 2.2×10-2mol/L.
The speciation and distribution of Gd(Ⅲ) in human interstitial fluid was studied by computer simulation.Meantime artificial neural network was applied to the estimation of log β values of complexes.The results show that the precipitate species, GdPO4 and Gd2(CO3)3, are the predominant species.Among soluble species, the free Gd(Ⅲ), [Gd(HSA)] , [Gd(Ox)] and then the ternary complexes of Gd(Ⅲ) with citrate are main species and [Gd3(OH)4] becomes the predominant species at the Gd(Ⅲ) total concentration of 2.2×10-2mol/L.
2003, 14(2): 219-220
Abstract:
UV-vis and luminescence spectroscopic titration experiments show that a novel Ru(Ⅱ) complex exhibits off-on-off pH luminescent switching with a maximum on-off ratio of about 100.
UV-vis and luminescence spectroscopic titration experiments show that a novel Ru(Ⅱ) complex exhibits off-on-off pH luminescent switching with a maximum on-off ratio of about 100.
