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Title: Kinetics and mechanism of formation of binary and ternary complexes of nickel(II) and nickel(II)-2- aminomethylbenzimidazole with 3-nitrosalicylate and cis- (ammine )(3-nitrosalicylato) bis (ethylenediamine)cobalt(III) : Evidence for the slow interconversion of the structural isomers of the ternary complexes
Authors: Dash, Anadi C
Sahoo, Rama K
Acharya, Achyuta N
Issue Date: Jan-1998
Publisher: NISCAIR-CSIR, India
Abstract: The kinetics of complex formation of 3-nitrosalicylate(NSAH-) and cis-(en)2(NH3)(3-nitrosalicylato)cobalt(III) with Ni(OH2)62+ and [Ni(AMB)(OH2)4]2+ (AMB = 2- aminomethylbenzimidazole) have been investigated. The formation of the ternary complexes [Ni(AMB)(NSA)(OH2)2] and [(en)2(NH3)Co{NSA=Ni(AMB)(OH2)2} ]3+ displayed biphasic kinetics due to the slow and reversible structural isomerisation (trans- (diaqua) species Û cis-( diaqua) species). The formation of [Ni(NSA)(OH2)4] is chelation-controlled. The isomerisation of the ternary complexes is presumed to involve Ni- N (benzimidazolyl-N) bond cleavage and rearrangement of the intermediate.
Page(s): 11-20
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.37A(01) [January 1998]

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