The influence of radiation on Rh(III) tetrasulfophthalocyanine in water-alcohol solutions

The effect of ionising radiation on Rh(III) tetrasulfophthalocyanine (Rh(III)tspc(3-)) in aqueous as well as in water-methanol and water-ethylene glycol solutions have been studied. The determined yields of complex decomposition (measured on the basis of absorption decay) depend on the composition of matrices, initial concentration of the complex and the dose applied. The rate constant of electron scavenging by Rh(III)tspc(3-) as equal to k = (8.2 +/- 0.8) x 10(9) M-l s(-1) in methanol-water (2 : 8 v/v) solutions has;ls been determined using the pulse radiolysis. The rate constants of scavenging of OH and CH2OH radicals applying the competition method with p-nitrosodimethylaniline (pNDA) have been determined as equal to k(1) = (4.3 +/- 0.7) x 10(9) M-1 s(-1) and k(2) = (2.5 +/- 0.3) x 10(7) M-1 s(-1) in aqueous and water-methanol solutions, respectively. (C) 2001 Elsevier Science Ltd. All rights reserved.