The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform
Vito Lubes - One of the best experts on this subject based on the ideXlab platform.
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Mixed-ligand complex formation equilibria of nickel(II) with picolinic acid and some amino acids (glycine, α-alanine, β-alanine, and proline) studied in 1.0 mol·dm− 3 NaCl at 25 °C
Journal of Molecular Liquids, 2016Co-Authors: Diomka Paloma Martínez, Mary Lorena Araujo, Felipe Brito, Alejandro Pérez, Lino Hernández, Vito LubesAbstract:Abstract Solution equilibria of the systems Ni(II)-Picolinic acid (HPic)- and the amino acids Glycine (HGly), Proline (HPro), α-alanine (HαAla) and β-alanine (HβAla) have been studied pH-metrically. The formation constants of the resulting mixed ligand complexes have been calculated at 25 °C and ionic strength 1.0 mol·dm − 3 NaCl. Ternary complexes are formed by simultaneous reactions. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of Δ log K″ values. Specie Distribution diagrams as a function of pH were briefly discussed.
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Formation Constants for the Ternary Complexes of Vanadium(III), 2,2′-Bipyridine, and the Amino Acids Histidine, Cysteine, Aspartic and Glutamic Acids
Journal of Solution Chemistry, 2012Co-Authors: Lino Hernández, Giuseppe Lubes, Mildred Rodríguez, Vito LubesAbstract:In this study we report the stability constants and the speciation of the ternary vanadium(III) complexes with 2,2′-bipyridine (Bipy) and the amino acids histidine (HHis), cysteine (H_2Cys), aspartic acid (H_2Asp) and glutamic acid (H_2Glu) by means of potentiometric titrations employing 3.0 mol⋅dm^−3 KCl as the ionic medium at 25 °C. The potentiometric data were analyzed taking into account the hydrolysis of the vanadium(III) cation and the respective stability constants of the binary complexes and the acid–base reactions of the ligands, which were kept fixed during the analysis. The complexes detected in the different systems are: in the vanadium(III)–Bipy–HHis system, [V(HBipy)(HHis)]^4+ and [V(HBipy)(H_2His)]^5+; in the vanadium(III)–Bipy–H_2Cys system, [V_2O(Bipy)(Cys)]^2+; in the vanadium(III)–Bipy–H_2Asp system, [V(Bipy) (Asp)]^+, [V_2O(Bipy)(Asp)]^2+, and V_2O(Bipy)_2(Asp)_2; and finally in the vanadium(III)–Bipy–H_2Glu system, [V(Bipy)(H_2Glu)]^3+ and [V(Bipy)(Glu)]^+. The respective stability constants were determined and the Specie Distribution diagrams as a function of pH are briefly discussed.
Lino Hernández - One of the best experts on this subject based on the ideXlab platform.
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Mixed-ligand complex formation equilibria of nickel(II) with picolinic acid and some amino acids (glycine, α-alanine, β-alanine, and proline) studied in 1.0 mol·dm− 3 NaCl at 25 °C
Journal of Molecular Liquids, 2016Co-Authors: Diomka Paloma Martínez, Mary Lorena Araujo, Felipe Brito, Alejandro Pérez, Lino Hernández, Vito LubesAbstract:Abstract Solution equilibria of the systems Ni(II)-Picolinic acid (HPic)- and the amino acids Glycine (HGly), Proline (HPro), α-alanine (HαAla) and β-alanine (HβAla) have been studied pH-metrically. The formation constants of the resulting mixed ligand complexes have been calculated at 25 °C and ionic strength 1.0 mol·dm − 3 NaCl. Ternary complexes are formed by simultaneous reactions. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of Δ log K″ values. Specie Distribution diagrams as a function of pH were briefly discussed.
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Formation Constants for the Ternary Complexes of Vanadium(III), 2,2′-Bipyridine, and the Amino Acids Histidine, Cysteine, Aspartic and Glutamic Acids
Journal of Solution Chemistry, 2012Co-Authors: Lino Hernández, Giuseppe Lubes, Mildred Rodríguez, Vito LubesAbstract:In this study we report the stability constants and the speciation of the ternary vanadium(III) complexes with 2,2′-bipyridine (Bipy) and the amino acids histidine (HHis), cysteine (H_2Cys), aspartic acid (H_2Asp) and glutamic acid (H_2Glu) by means of potentiometric titrations employing 3.0 mol⋅dm^−3 KCl as the ionic medium at 25 °C. The potentiometric data were analyzed taking into account the hydrolysis of the vanadium(III) cation and the respective stability constants of the binary complexes and the acid–base reactions of the ligands, which were kept fixed during the analysis. The complexes detected in the different systems are: in the vanadium(III)–Bipy–HHis system, [V(HBipy)(HHis)]^4+ and [V(HBipy)(H_2His)]^5+; in the vanadium(III)–Bipy–H_2Cys system, [V_2O(Bipy)(Cys)]^2+; in the vanadium(III)–Bipy–H_2Asp system, [V(Bipy) (Asp)]^+, [V_2O(Bipy)(Asp)]^2+, and V_2O(Bipy)_2(Asp)_2; and finally in the vanadium(III)–Bipy–H_2Glu system, [V(Bipy)(H_2Glu)]^3+ and [V(Bipy)(Glu)]^+. The respective stability constants were determined and the Specie Distribution diagrams as a function of pH are briefly discussed.
Diomka Paloma Martínez - One of the best experts on this subject based on the ideXlab platform.
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Mixed-ligand complex formation equilibria of nickel(II) with picolinic acid and some amino acids (glycine, α-alanine, β-alanine, and proline) studied in 1.0 mol·dm− 3 NaCl at 25 °C
Journal of Molecular Liquids, 2016Co-Authors: Diomka Paloma Martínez, Mary Lorena Araujo, Felipe Brito, Alejandro Pérez, Lino Hernández, Vito LubesAbstract:Abstract Solution equilibria of the systems Ni(II)-Picolinic acid (HPic)- and the amino acids Glycine (HGly), Proline (HPro), α-alanine (HαAla) and β-alanine (HβAla) have been studied pH-metrically. The formation constants of the resulting mixed ligand complexes have been calculated at 25 °C and ionic strength 1.0 mol·dm − 3 NaCl. Ternary complexes are formed by simultaneous reactions. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of Δ log K″ values. Specie Distribution diagrams as a function of pH were briefly discussed.
Mary Lorena Araujo - One of the best experts on this subject based on the ideXlab platform.
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Mixed-ligand complex formation equilibria of nickel(II) with picolinic acid and some amino acids (glycine, α-alanine, β-alanine, and proline) studied in 1.0 mol·dm− 3 NaCl at 25 °C
Journal of Molecular Liquids, 2016Co-Authors: Diomka Paloma Martínez, Mary Lorena Araujo, Felipe Brito, Alejandro Pérez, Lino Hernández, Vito LubesAbstract:Abstract Solution equilibria of the systems Ni(II)-Picolinic acid (HPic)- and the amino acids Glycine (HGly), Proline (HPro), α-alanine (HαAla) and β-alanine (HβAla) have been studied pH-metrically. The formation constants of the resulting mixed ligand complexes have been calculated at 25 °C and ionic strength 1.0 mol·dm − 3 NaCl. Ternary complexes are formed by simultaneous reactions. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of Δ log K″ values. Specie Distribution diagrams as a function of pH were briefly discussed.
Alejandro Pérez - One of the best experts on this subject based on the ideXlab platform.
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Mixed-ligand complex formation equilibria of nickel(II) with picolinic acid and some amino acids (glycine, α-alanine, β-alanine, and proline) studied in 1.0 mol·dm− 3 NaCl at 25 °C
Journal of Molecular Liquids, 2016Co-Authors: Diomka Paloma Martínez, Mary Lorena Araujo, Felipe Brito, Alejandro Pérez, Lino Hernández, Vito LubesAbstract:Abstract Solution equilibria of the systems Ni(II)-Picolinic acid (HPic)- and the amino acids Glycine (HGly), Proline (HPro), α-alanine (HαAla) and β-alanine (HβAla) have been studied pH-metrically. The formation constants of the resulting mixed ligand complexes have been calculated at 25 °C and ionic strength 1.0 mol·dm − 3 NaCl. Ternary complexes are formed by simultaneous reactions. The relative stability of each ternary complex was compared with that of the corresponding binary complexes in terms of Δ log K″ values. Specie Distribution diagrams as a function of pH were briefly discussed.