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|Title:||Potentiometric and spectral studies of the solution equilibria in Ni(II)-6- aminopenicillanic acid-imidazole containing ligand systems|
|Authors:||Nair, M Sivasankaran|
Neelakantan, M A
|Abstract:||Stability constants of NiABH2, NiABH, NiAB or NiAB2 mixed ligand complexes in Ni(II)-6-arnmopenicilianic acid (6apa) (A)-imidazoles [imidazole(him), benzimidazole(bim), histamine(hist) & L-histidine(his)] (B) systems are reported. The 6apa (A) ligand binds via 6-amino nitrogen and 7-carbonyl oxygen atoms in the NiAB and NiAB2 complexes and the size of the chelate ring formed by 6apa (A) explains higher stability for NiAB2 compared to that of NiAB. Both the stability constant and absorption maximum values for the NiAB species indicate respectively rnono-, bi- and tri-dentate binding of him, hist & his (B) ligands. The results indicate the site of protonation in NiABH species to be with A, while in NiABH2 species one proton is attached with A, and other with B.|
|Appears in Collections:||IJC-A Vol.38A(06) [June 1999]|
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