1993
DOI: 10.1039/dt9930000917
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Mixed-ligand complexes involving sulfur-containing ligands. Part 1. Nickel(II) ternary complexes of L-cysteine, D-penicillamine and L-cysteic acid with imidazoles

Abstract: Computer-based analysis of the pH-titration data obtained in aqueous perchlorate medium at 37 "C and / = 0.1 5 mol dm-3 (NaCIO,) for Nil1-A-B ternary systems [A = L-cysteine (Cys), o-penicillamine (pen) or L-cysteic acid (Cya); B = imidazole (Him), histamine (Hist) or L-histidine (His)] showed the presence of the ternary species NiABH,, NiABH, NiAB and NiAB, in addition to binary species with A or B. Under the same experimental conditions, binary systems of Nil' with Cys, pen, Cya, Him, Hist and His have also … Show more

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Cited by 10 publications
(6 citation statements)
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“…Aqueous‐phase protonation constants for the chiral selector analogue ( p ‐MBD‐penicillamine) are similar but not identical to those reported previously for the carboxylic (the pK a for species 02001 is reported to be 1.9122, 23) and α‐amino ( pK a for species 01001 reported to be 8.1023) groups of penicillamine. The addition of 10% isopropanol decreases the pK a for species 01001, the protonation constant for the α‐amino group, and increases the pK a for the α‐carboxyl group.…”
Section: Resultssupporting
confidence: 76%
“…Aqueous‐phase protonation constants for the chiral selector analogue ( p ‐MBD‐penicillamine) are similar but not identical to those reported previously for the carboxylic (the pK a for species 02001 is reported to be 1.9122, 23) and α‐amino ( pK a for species 01001 reported to be 8.1023) groups of penicillamine. The addition of 10% isopropanol decreases the pK a for species 01001, the protonation constant for the α‐amino group, and increases the pK a for the α‐carboxyl group.…”
Section: Resultssupporting
confidence: 76%
“…In continuation of our earlier works on amino acid ternary complexes, we report here the solution equilibria and stability of ternary complexes of Ni(II), Cu(II), and Zn(II) with pyridoxine (PN) in the presence of imidazole containing ligands, namely, imidazole (him), benzimidazole (bim), histamine (hist), and l -histidine (his). pH metric, spectrophotometric, and cyclic voltammetric studies on these systems were carried out.…”
Section: Introductionmentioning
confidence: 87%
“…All other chemicals used were of reagent grade purity. Metal perchlorates and other reagents were prepared and estimated as described elsewhere. The dilute solutions were prepared from doubly distilled deionized water which was previously boiled to remove dissolved CO 2 . Alkali titer concentrations and the absence of carbonate were periodically checked by means of the appropriate Gran titrations against potassium hydrogen phthalate.…”
Section: Methodsmentioning
confidence: 99%
“…The ternary stability constants were computed by fixing the dissociation constants of the ligands and the binary stability constants as non-refinable parameters. The binary stability constants for nickel(II) cys, -pen and -cya (A) systems under the present experimental conditions were reported previously (3). Data for the nickel(II)-dapa, -daba and -orn (B) binary systems were obtained as part of this study by following the procedures described previously(3); the results are presented in Table 1.…”
Section: Methodsmentioning
confidence: 99%