Interaction of nitric oxide with cobalt(II) tetrasulfophthalocyanine

The interaction of nitric oxide (NO) with cobalt(II) tetrasulfophthalocyani ne [Co(II)TSPc](4-)) has been studied. Coordination of NO is accompanied by electron transfer from the central metal in [Co(II)TSPc](4-), the resultin g complex being represented as [(NO-)Co(III)TSPc](4-). The rate constant fo r the formation of this species is k(t) = 142 +/- 7 dm(3) mol(-1) s(-1) and an equilibrium constant of 3.0 +/- 0.5 X 10(5) dm(3) mol(-1) was obtained. When adsorbed to a glassy carbon electrode, [Co(II)TSPc](4-) catalyses the oxidation and reduction of NO, with a detection limit of the order of 10(- 9) mol dm(-3). Ammonia and hydroxylamine are some of the reduction products obtained for the reduction of NO on [Co(II)TSPc](4-) -modified glassy carb on electrodes. (C) 2000 Elsevier Science Ltd All rights reserved.