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Title: Kinetics and mechanism of acid assisted reduction of unsymmetrical chelate complex [CoIII(Am) (endibigH) (ClO4)2] (where Am= amino acid and endibigH = ethylenedibiguanide)
Authors: Majee, Asim Kumar
Chaturvedi, D D
Srivastava, Abhishek
Agarwal, Abhinav
Naik, R M
Nigam, PC
Issue Date: Oct-2004
Publisher: NISCAIR-CSIR, India
IPC Code: Int Cl.7 C07B 35/02
Abstract: The acid mediated dissociation of three mixed chelate complexes of cobalt(III) containing a common primary quadridentate ligand ethylenedibiguanide and secondary bidentate amino acid anions, viz., glycinate, α-alaninate and valinate have been investigated spectrophotometrically at 490 nm to study the influence of chelate size, ring pattern, bonding nature and basicity of the ligand on the dissociation rates. The kobs values for all these complexes vary linearly with [HClO4] having a positive slope and no intercept. The reactivity order of the complexes is: DL-valinato < α-alaninato < glycinato. For all these complexes, solvent assisted metal-ligand bond rupture is proposed. The reactions have been studied as a function of ionic strength, dielectric constant of the medium and temperature. The activation parameters have been evaluated and used in support of the proposed mechanistic scheme.
Page(s): 2105-2108
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(10) [October 2004]

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