OXIDATIVE DEHYDROGENATION OF THE LIGAND COORDINATED TO THE FAC-TRIS(2-AMINOMETHYLPYRIDINE)COBALT(III) COMPLEX

Kinetics of the oxidative dehydrogenation of the tris(2-aminomethylpyr idine)cobalt(III) complex, [Co(pic)(3)](3+), have been studied followi ng spectrophotometrically the appearance of blue species under nitroge n atmosphere. The mechanism involves a deprotonation step, in a pre-eq uilibrium, generating an intermediate which is susceptible to an oxida tion by either the complex itself or the perchlorate ion. The equilibr ium constant (K-OH = 27.2 +/- 0.2 M-1) and the rate constant (k(el) =0 .41 +/- 0.001 M-1 s(-1)) were obtained by two distinct and independent treatments as Well as different sets of experiments. (C) 1998 Elsevie r Science Ltd. All rights reserved.