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Stoichiometry and Stability Constant Values for Copper (II) Chelates with Ethylene Diamine in Deep Eutectic Solvents (DES) (Ethaline) Solutions
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作者 Khalid El Ttaib Abdolhadi Benhmid Rifat Hasan Omar 《Open Journal of Applied Sciences》 2024年第9期2592-2609,共18页
In this study we used the deep eutectic solvents (ionic liquids) to investigate the reaction between copper (II) with ethylene diamine (en). Two of the existing methods for analyzing spectrophotometric measurements ha... In this study we used the deep eutectic solvents (ionic liquids) to investigate the reaction between copper (II) with ethylene diamine (en). Two of the existing methods for analyzing spectrophotometric measurements have been applied for establishing, the stoichiometry and whenever possible, the stability constants of the chelates formed. The method of continuous variations was necessary to determine first whether, the metal ion and the ligand ethylene diamine form one or more than one chelate, when more than one chelate formed, the results obtained depend on the wavelength and for meaningful conclusions the wavelengths were carefully selected. The empirical formulae of the chelates were further substantiated by the molar ratio method. The effect of time and temperature on the formation and stability of these chelates in solution is also studied. The stability constants, K1 and K2 for the copper (II) chelates were calculated, though reliable, and are comparable to literature values. 展开更多
关键词 CU(II) Ethylene Diamine (en) Deep Eutectic Solvents Job’s Method Ionic Liquids and stability constant
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Determination of Stability Constants of Cadmium-Glycine Complexes by a Unified Treatment for Potentiometric and Polarographic Data
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作者 张建民 石秋芝 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2006年第2期164-168,共5页
The cadmium(Ⅱ)-glycine system was studied by the two experimental techniques, ion sensitive electrode (ISE) and differential pulse polarography (DPP), and the experimental data obtained were used by a unified m... The cadmium(Ⅱ)-glycine system was studied by the two experimental techniques, ion sensitive electrode (ISE) and differential pulse polarography (DPP), and the experimental data obtained were used by a unified mathematical treatment to calculate the complex stability constants. The combination of the two techniques is of many advantages as ISE can be performed at low [LT]:[MT] ratios and significantly higher [MT], whereas DPP could be used well at large [LT]:[MT] ratios and much smaller [MT]. This makes it possible to study a metal-ligand system in a relatively broader range of experimental conditions that, in turn, provides more information about the metakligand system of interest. Applying the unified mathematical treatment to the cadmium-glycine system, two new complexes MHL and ML2(OH) as well as three complexes ML, ML2 and ML3, reported in literatures, could be modeled and all their stability constants have been refined. 展开更多
关键词 Metal complex POLAROGRAPHY POTENTIOMETRY stability constant
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Stability Constants and Fluorescence of Terbium(Ⅲ) Complexes with Polyaminopolycarboxylates in Aqueous Solution 被引量:1
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作者 GONG Meng lian WU Wei ning +3 位作者 SHI Hua hong LEI Heng yi MENG Jian xin YANG Yan sheng 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1998年第4期11-16,共6页
IntroductionAvarietyofnewpolyaminopolycarboxylateligandsandtheirlanthanidecomplexeshavebeensynthesizedinrece... IntroductionAvarietyofnewpolyaminopolycarboxylateligandsandtheirlanthanidecomplexeshavebeensynthesizedinrecentyearsbecauseoft... 展开更多
关键词 Terbium(Ⅲ) Polyaminopolycarboxylate COMPLEX stability constant FLUORESCENCE
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Magnesium (II) Adsorption from Aqueous Solutions on China Clay and the Stability Constants for Complex Formation 被引量:1
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作者 S.BEGUM F.U.KHAN 《Pedosphere》 SCIE CAS CSCD 1998年第2期169-174,共6页
China clay was employed as an adsorbent for the removal of Mg 2+ from water at pH 7.0 within the temperature range of 303~328 K. The linearity of the plots indicated Langmuir type isotherms. The reaction was ex... China clay was employed as an adsorbent for the removal of Mg 2+ from water at pH 7.0 within the temperature range of 303~328 K. The linearity of the plots indicated Langmuir type isotherms. The reaction was exothermic. A maximum removal of 35% was obtained at 0.50 mmol L -1 metal concentration and a pH of 7.0 at 303 K. The H + rel /Mg 2+ ads ratio changed from a fractional value to 2.5. Strong chemical bondings took place between oxygen atom of the surface and Mg 2+ , resulting in a surface complex species. Temperature had a significant effect on H + rel , and the stability constants also increased with increasing temperature. 展开更多
关键词 H + releasing Mg 2+ adsorption stability constants temperature
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Stability constants of Sb^5+with Cl−and thermodynamics of Sb−S−Cl−H2O system involving complex behavior of Sb with Cl 被引量:1
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作者 Gang LI Yun-tao XIN +3 位作者 Xiao-dong Lü Qing-hua TIAN Kang YAN Long-gang YE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第12期3379-3389,共11页
The stability constants of Sb^5+with Cl−as well as thermodynamics of the Sb−S−Cl−H2O system were calculated.The stability constants of Sb5+with Cl−were obtained by theoretical calculations of the absorbance of a Sb5+-... The stability constants of Sb^5+with Cl−as well as thermodynamics of the Sb−S−Cl−H2O system were calculated.The stability constants of Sb5+with Cl−were obtained by theoretical calculations of the absorbance of a Sb5+-containing solution at different Cl^−concentrations,which was detected by spectrophotometric analysis at certain wavelengths of light(380 nm).The logarithmic values versus 10 of stability constants of Sb^5+with Cl−were 1.795,3.150,4.191,4.955,5.427 and 5.511,respectively,and partly filled the data gaps in the hydrometallurgy of antimony.The presence and distribution of pentavalent antimony compounds under different conditions were analyzed based on equilibrium calculations.Thermodynamic equilibrium calculations were performed for Sb−S−Cl−H2O system,which included the complex behavior of Sb with Cl,and the equilibrium equations of related reactions in this system were integrated into the potential−pH diagram. 展开更多
关键词 complex behavior stability constant thermodynamics Sb−S−Cl−H2O system
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Thermodynamics of Stability Constant of Binary Complex of Nicotinamide with Mn^(++) 被引量:1
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作者 Tuba SISMANOGLU 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第11期1207-1210,共4页
The stability constants of the binary complexes of Mn2+ with nicotinamide (NA) were determined from potentiometric pH titrations data at 15.0 , 25.0 and 35.0oC and I = 0.1,0.2,0.4 mol L-1 (NaClO4). The formation of bi... The stability constants of the binary complexes of Mn2+ with nicotinamide (NA) were determined from potentiometric pH titrations data at 15.0 , 25.0 and 35.0oC and I = 0.1,0.2,0.4 mol L-1 (NaClO4). The formation of binary 1:1 , 1:2 NA-Mn complexes at three different temperatures and the influence of three different ionic strength on their stability were reported. The thermodynamic parameters (DGof, DSof, DHof) for the complex formation reaction were estimated from stability constant at different temperatures. 展开更多
关键词 NICOTINAMIDE stability constant binary complexes.
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Method of Calculation of Stability Constants of Fulvic Complexes on the Example of Copper 被引量:1
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作者 Giorgi Makharadze Tamar Makharadze 《Journal of Chemistry and Chemical Engineering》 2014年第2期108-111,共4页
On the example of copper fulvate, it is discussed the method of calculation of stability constants of fulvic complexes. At pH = 8, the complex formation of copper(ll) ions with fulvic acids was studied by the solubi... On the example of copper fulvate, it is discussed the method of calculation of stability constants of fulvic complexes. At pH = 8, the complex formation of copper(ll) ions with fulvic acids was studied by the solubility method. Fulvic acids were separated from the river Mtkvari by the adsorption-chromotographic method. The charcoal (BAU, Russia) was used as a sorbent. The suspension of copper(If) hydroxide was used as the solid phase, on which was added the increasing quantity of standard solution of fulvic acids. In diluted solutions, at pH = 8 the dominant form of copper(lI) is copper dihydroxo complex Cu(OH)^zO. It was established that in the Cu(OH)2 (solid)-Cu(OH)^20 (solution)-FA^2-H20 system, dominates copper dyhydroxo fulvate complex with the structure 1:1, [Cu(OH)2FA]^2. The average stability constant of copper dyhydroxo fulvate complex was calculated based on experimental data fl [Cu(OH)2FAJ^2 = 4.5× l0^5. 展开更多
关键词 COPPER fulvic acids the average stability constant copper fulvate water.
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Determination of Composition and Stability Constant of Praseodymium(Pr^(3+))Complex with Tribromoarsenazo(TBA)by Dual-Series Linear Regression Method
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作者 魏永巨 李克安 +1 位作者 张占辉 童沈阳 《Journal of Rare Earths》 SCIE EI CAS CSCD 1993年第4期283-287,共5页
A new method,dual-series linear regression method,has been used to study the complexation equilibrium of praseodymium(Pr^(3+))with tribromoarsenazo(TBA)without knowing the accurate concentra- tion of the complexing ag... A new method,dual-series linear regression method,has been used to study the complexation equilibrium of praseodymium(Pr^(3+))with tribromoarsenazo(TBA)without knowing the accurate concentra- tion of the complexing agent TBA.In 1.2 mol/L HCl solution, Pr^(3+)reacts with TBA and forms 1:3 com- plex,the conditional stability constant(lgβ_3)of the complex determined is 15.47,and its molar absorptivity(ε_3^(630))is 1.48×10~5 L·mol^(-1)·cm^(-1). 展开更多
关键词 Dual-series linear regression method PRASEODYMIUM TRIBROMOARSENAZO stability constant SPECTROPHOTOMETRY
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The Study on the Stability Constant and Species Distribution of Eu (III) and Tb (III) Complexes with BDBPH
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作者 Guo Qiang SHANGGUAN Jun ZHU +1 位作者 Ning WANG Jia Zuan NI 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第12期1671-1674,共4页
The stability constants and species distributions of complexes of two lanthanide ions, Eu(Ⅲ) and Tb(Ⅲ), with a macrocyclic ligand, BDBPH, in 1:1 and 2:lsystem, were determined potentiometrically at 25.0 ℃ and... The stability constants and species distributions of complexes of two lanthanide ions, Eu(Ⅲ) and Tb(Ⅲ), with a macrocyclic ligand, BDBPH, in 1:1 and 2:lsystem, were determined potentiometrically at 25.0 ℃ and I=0.100 mol L^-l. The two metal ions could form deprotonated mono- or dinuclear complexes with BDBPH after the first two protons of the ligand completely neutralized. At higher pH values, Eu(Ⅲ) could not form hydroxy complexes with BDBPH, while Tb(Ⅲ) could form hydroxy complexes in the type of M2L(OH), M2L(OH)2, and M2L(OH)3. 展开更多
关键词 BDBPH Eu(Ⅲ) Tb(Ⅲ) stability constant species distribution
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The Stability Constants of Complexes of BDBPH- Metals and Species Distributions
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作者 Guo Qiang SHANGGUAN Jun ZHU +1 位作者 Ke Ying WANG Arthur EMARTELL 《Chinese Chemical Letters》 SCIE CAS CSCD 2001年第10期925-928,共3页
The stability constants of the mononuclear complexes of BDBPH-Zn(II), Cd(II) and Mn (II) were determined by the potentiometric equilibrium measurements, and species distributions were also discussed. The metal ions do... The stability constants of the mononuclear complexes of BDBPH-Zn(II), Cd(II) and Mn (II) were determined by the potentiometric equilibrium measurements, and species distributions were also discussed. The metal ions do not combine with the ligand until the first two protons of the ligand have almost been completely neutralized. The main species were mononuclear complexes with the diprotonated ligand, MH,L. The three metal ions also form mono- and noprotonated (fully deprotonated) complexes, MHL, ML. The relative order of stabilities of the mononuclear complexes, ML, is Zn(II) > Cd(II) > Mn(II). The ligand has strong tendency to form mononuclear complexes with Zn(II), Cd(II) and Mn(II), and it can also form dinuclear complexes at high pH. 展开更多
关键词 BDBPH stability constant mononuclear complex species distribution
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DETERM INATION OF THE STABILITY CONSTANTS OF COMPLEXES OF HISTIDINE,SOME DIPEPTIDES AND TRIGLYCINE WITH Zn(Ⅱ)AND Cd(Ⅱ)USING SMALL-SCALE PH-METRIC TITRATIONS
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作者 Ai Ru LU Department of Chemistry,Northwest Normal University,Lanzhou,730070 Leslie D.PETTIT Jan E.GREGOR School of Chemistry,The University,Leeds LS2 9JT,U.K 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第9期723-724,共2页
A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car- ried out to determine stabil ity constant... A potentiometric study on the complexes of His,Gly-His,ALa-His,Gly-Gly and Gly—Gly—Gly with Zn(Ⅱ)and Cd(Ⅱ)has been reported.Small-scale potentiometric titrations were car- ried out to determine stabil ity constants of complexes at 25℃ with I=0.10 mol dm^(-3)(KNO_3).The com- puter programs SUPERQUAD were applied for data treatment with satisfactory results. 展开更多
关键词 Gly DETERM INATION OF THE stability constantS OF COMPLEXES OF HISTIDINE SOME DIPEPTIDES AND TRIGLYCINE WITH Zn AND Cd USING SMALL-SCALE PH-METRIC TITRATIONS
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A COMPARISON OF THE DETERMINATION OF STABILITY CONSTANTS OF COMPLEXES OF Cd(Ⅱ)WITH AMINO ACIDS AND SIMPLE PEPTIDES USING MICRO—pH—METRIC TITRATIONS AND CYCLIC VOLTAMMETRY
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作者 Ai Ru LU Department of Chemistry,Northwest University,Lanzhou,730070Leslie D.PETTIT Gareth BERNARD Jan E.GREGOR School of Chemistry,The University of Leeds,Leeds,LS2,9JT,U.K. 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第10期933-934,共2页
This paper reports the determination of stability constants for complexes of Cd(Ⅱ)with Gly, Ala,Val,Asp,Gly—Asp,Asp Gly,Gly—Gly and Gly—Gly—Gly using both micro—pH—metric titra- tions and the application of con... This paper reports the determination of stability constants for complexes of Cd(Ⅱ)with Gly, Ala,Val,Asp,Gly—Asp,Asp Gly,Gly—Gly and Gly—Gly—Gly using both micro—pH—metric titra- tions and the application of convolution—deconvolution cyclic voltammetry at 25℃ and I=0.10 mol· dm^(-3)(KNO_3).Stability constants were calculated from pH—metric data using the SUPERQUAD com- puter program and cyclic voltammograms were collected,stored and manipulated using the EG and G CONDECON 300 software.A considerably larger ligand:metal ratio(e,g.50:1)was possible using voltammetry.Evaluation of results from the two techniques suggests that stability constants for the species[CdL_2]and[CdL_3]are reliable when calculated fromvoltammetry while those for[CdL]are more reliable when determined by pH-metric titration. 展开更多
关键词 A COMPARISON OF THE DETERMINATION OF stability constantS OF COMPLEXES OF Cd METRIC TITRATIONS AND CYCLIC VOLTAMMETRY WITH AMINO ACIDS AND SIMPLE PEPTIDES USING MICRO pH
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DETERMINATION OF STABILITY CONSTANTS OF THE COORDINATION COMPOUNDS OF Au(Ⅲ)-2-MERCAPTOPYRIDINE-1-OXIDE AND METHYL DERIVATIVES——METHOD OF DUAL-WAVELENGTH CORRESPONDING SOLUTIONS
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作者 Yang CAO Bao Lin SONG Department of Chemistry,Xuzhou Teacher’s College,Xuzhou 221009Cheng ZENG Coordination Chemistry Institute,Nanjing University,Nanjing 210008 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第1期59-62,共4页
In this paper,we report the deductive formula used for the method of dual-wavelength corresponding solutions under condition of having ligand interference and the stability constants of three new coordination compound... In this paper,we report the deductive formula used for the method of dual-wavelength corresponding solutions under condition of having ligand interference and the stability constants of three new coordination compounds [AuL_2]^+determined with this method.The stability of the three compounds,the necessity of controlling pH in experimental systems and the advantage of this method are discussed in detail. 展开更多
关键词 DETERMINATION OF stability constantS OF THE COORDINATION COMPOUNDS OF Au MERCAPTOPYRIDINE-1-OXIDE AND METHYL DERIVATIVES METHOD OF DUAL-WAVELENGTH CORRESPONDING SOLUTIONS
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The Determination of Average Stability Constant of NickeI-FA Complex at pH = 8,0 by the Solubility Method
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作者 Giorgi Makharadze Nazi Goliadze +1 位作者 Tamar Makharadze Guram Supatashvili 《Journal of Chemistry and Chemical Engineering》 2014年第4期344-348,共5页
At pH = 8, the complex formation process of Ni(Ⅱ) ions with FA was studied by the solubility method. FA were separated from the river Mtkvari by the adsorption-chromotographic method. The charcoal (BAU, Russia) w... At pH = 8, the complex formation process of Ni(Ⅱ) ions with FA was studied by the solubility method. FA were separated from the river Mtkvari by the adsorption-chromotographic method. The charcoal (BAU, Russia) was used as a sorbent. The old suspension of Ni(Ⅱ) hydroxide was used as the solid phase, on which was added the increasing quantity of standard solution of FA. In diluted solutions, at pH = 8.0 the dominant form of Ni(Ⅱ) is nickel dihydroxocomplex Ni(OH)2^0. It was established that in the Ni(OH)2(solid)-Ni(OH)2^0(solution)-FA2-H20 system dominates nickel dyhydroxofulvate complex with the structure 1:1, [Ni(OH)2FA]2-. The average stability constant of nickel dyhydroxofulvate complex was calculated based on experimental data flNi(OH)2FA2" = 5.3 × 105. 展开更多
关键词 NICKEL FA average stability constant nickel fulvate water.
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Mobile Equilibrium Method for Determining Composition and Stability Constant of Coordination Compounds of the Form M_mR_n
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作者 周执明 毛东森 叶存孝 《Journal of Rare Earths》 SCIE EI CAS CSCD 1997年第3期57-60,共4页
A new method is proposed for determining the composition and stability constant of coordination compounds of the form M m R n ; it can be used to differentiate mono and poly nuclear coordination compounds. ... A new method is proposed for determining the composition and stability constant of coordination compounds of the form M m R n ; it can be used to differentiate mono and poly nuclear coordination compounds. The equation derived is lg( A i/(A max - A i) m)=n lg c′ R+lg( m·β(c M/A max ) ( m -1) ). The method is based on Bent French limited logarithm method. The demonstration of the proposed method has yielded correct results for Sc 3+ chlorophosphonazo Ⅲ system and Fe 3+ Chromazurol S system. 展开更多
关键词 Rare earths Mobile equilibrium method Polynuclear coordination compounds COMPOSITION stability constant
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Voltammetric determination of stability constants of lead complexes with diallyl disulfide, dimethyl disulfide, and diallyl sulfide
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作者 Mohammad Ali Kamyabi Fatemeh Soleymani-Bonoti Saeed Zakavi 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第1期71-76,共6页
The complexation of Pb^(2+)by diallyl disulfide(DADS), dimethyl disulfide(DMDS) and diallyl sulfide(DAS)has been studied by differential pulse voltammetry. Stability constants,(log b), of the 1:1(PbL) an... The complexation of Pb^(2+)by diallyl disulfide(DADS), dimethyl disulfide(DMDS) and diallyl sulfide(DAS)has been studied by differential pulse voltammetry. Stability constants,(log b), of the 1:1(PbL) and 1:2(PbL_2) complexes, where L = ligand, were found to be in the range of ca. 3.8-4.2 and 9.4-10.2,respectively. Complex formation is accompanied with a significant decrease in the peak current and the shift of the Pb2+/Pb half-wave potential to a higher one upon the addition of the sulfur containing ligands(L). The formation of 1:1 and 1:2 complexes, i.e., PbL^(2+)and PbL_2^(2+)was observed in the case of the three ligands. The consecutive formation constants of labile lead complexes with DADS, DMDS, and DAS were determined at 298 K by the method of De Ford and Hume. Apparently due to the large size of the lead ion,steric hindrance caused by the greater steric bulk of DADS compared to that of DMDS have little or no effects on the formation constants, so that very similar values were obtained in the case of the two ligands. Also, the possible participation of C=C double bonds in coordination with the metal center in the case of DADS appears to compensate for the steric effects caused by the larger size of this ligand. In agreement with the Jorgensen principle of symbiosis, the second formation constants were found to be approximately six orders of magnitude greater than the first ones. 展开更多
关键词 Garlic oil Organic sulfur compounds Pb^(2+)-DADS DMDS and DAS complexes stability constant
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Proposal of the partial logarithm of stability constant(PLSC) and its application to rare earth diethylenetriamine-N,N,N',N',N",-pentaacetic acid(DTPA) complexes
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作者 Gin-ya Adachi 《Journal of Rare Earths》 SCIE EI CAS CSCD 2018年第4期339-340,共2页
The purpose of this article is to propose the idea of "a partial stability constant" for the complex formation of polyamine polyacetic acids with tripositive rare earth ion. Each coordinating group has its own chara... The purpose of this article is to propose the idea of "a partial stability constant" for the complex formation of polyamine polyacetic acids with tripositive rare earth ion. Each coordinating group has its own characteristic stability constant,i.e.,"the partial stability constant" and simple numerical addition can be used among the partial logarithm of the stability constant(PLSC), for explanation of the total stability constants. The structures of the rare earth-diethylenetriamine-N,N,N',N',N"-pentaacetic acid(DTPA)complexes in aqueous solution has been discussed from the point of PLSC. 展开更多
关键词 Polyamine Polyacetic acid stability constants NTA EDTA DTPA
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A comparison of the determination of stability constants of complexes of Pb(II) with amino acids using micro-pH-metric titrations and cyclic voltammetry 被引量:1
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作者 LU Ai-Ru PETTIT Leslie +1 位作者 D.BERNARD Gareth GREGOR Jan E. 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1991年第6期493-498,共0页
This paper reports the determination of stability constants for complexes of Pb(Ⅱ) with Gly, Ala, Asp and Gly-Gly using both micro-pH-metric titrations and the application of convolution-de- convolution cyclic voltam... This paper reports the determination of stability constants for complexes of Pb(Ⅱ) with Gly, Ala, Asp and Gly-Gly using both micro-pH-metric titrations and the application of convolution-de- convolution cyclic voltammetry at 25℃ and I = 0.10 mol.dm^(-3)(KNO_3). Stability constants were calculated from pH-metric data using the SUPERQUAD computer program and cyclic voltammograms were collected, stored and manipulated using the E G and G CONDECON 300 software. A consider- ably larger ligand: metal ratio (e.g. 50:1) was possible using voltammetry. Under these conditions, hydroxy complex formation was minimised and the formation of bis-complexes optimised. Computer based calculations were carried out on PC-compatible microcomputers fitted with mathematics co- processors. Evaluation of results from the two techniques suggests that stability constants for the species [PbL_2] are reliable when calculated from voltammetry while those for [PbL] are mote reliable when determined by pH-metric titration. 展开更多
关键词 A comparison of the determination of stability constants of complexes of Pb with amino acids using micro-pH-metric titrations and cyclic voltammetry pH II
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Determination of the acid dissociation constants of N-carboxymethyl-N-(p-hydroxy phenyl carbamoylmethyl)-2,3-dihydroxy- 5-carbomethoxy benzylamine and the stability constants of its metal complexes
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作者 YAN Qing-Yu JIANG Ning +1 位作者 GE Chang-Sheng XIE Yu-Yuan 《Acta Chimica Sinica English Edition》 SCIE CAS CSCD 1989年第2期136-144,共1页
The acid dissociation constants of N-carboxymethyl-N-(p-hydroxy phenyl carbamoyl- methyl)-2,3-dihydroxy-5-carbomethoxy benzylamine(CHDCB) and the stability constants of its 1:1 complexes with alkaline earth, Cd(Ⅱ), ... The acid dissociation constants of N-carboxymethyl-N-(p-hydroxy phenyl carbamoyl- methyl)-2,3-dihydroxy-5-carbomethoxy benzylamine(CHDCB) and the stability constants of its 1:1 complexes with alkaline earth, Cd(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ), Zn(Ⅱ), Fe(Ⅲ),Th(Ⅳ)and U(Ⅵ)ions have been determined at 25.0±0.1℃ and at an ionic strength of 0.1(KNO_3)by pH titration method. The probable coordination sites have also been discussed. 展开更多
关键词 p-hydroxy phenyl carbamoylmethyl Determination of the acid dissociation constants of N-carboxymethyl-N carbomethoxy benzylamine and the stability constants of its metal complexes dihydroxy acid
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STABILITY OF SOME POSITIVE LINEAR OPERATORS ON COMPACT DISK
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作者 M.MURSALEEN Khursheed J.ANSARI Asif KHAN 《Acta Mathematica Scientia》 SCIE CSCD 2015年第6期1492-1500,共9页
Recently, Popa and Rata [27, 28] have shown the (in)stability of some classical operators defined on [0, 1] and found best constant when the positive linear operators are stable in the sense of Hyers-Ularn. In this ... Recently, Popa and Rata [27, 28] have shown the (in)stability of some classical operators defined on [0, 1] and found best constant when the positive linear operators are stable in the sense of Hyers-Ularn. In this paper we show Hyers-Ulam (in)stability of complex Bernstein-Schurer operators, complex Kantrovich-Schurer operators and Lorentz operators on compact disk. In the case when the operator is stable in the sense of Hyers and Ulam, we find the infimum of Hyers-Ulam stability constants for respective operators. 展开更多
关键词 Hyers-Ulam stability Bernstein-Schurer operators Kantrovich-Schurer opera-tors Lorentz operators stability constants
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