Kinetics of Interaction of the [Pd2Cl2(tppz)]2+ Cation with Guanine in Aqueous DMSO, and Solvatochromic Properties of the Complex in Aqueous DMSO Mixtures

The binucleating ligand, 2,3,5,6-tetrakis(2pyridyl)pyrazine, (tppz) (Structure I), has been known for more than forty years [1], and has been used to produce homoand heterobimetallic complexes of osmium/ruthenium [2] and ruthenium/iridium [3]. The photoand electrochemical properties of these complexes, and those of osmium/osmium have been reported [4]. The formation of the iron(II) complexes of tppz were reported long ago [1], and we have reported a kinetic study of nucleophilic substitution at the [Fe(tppz)2] centre, together with the kinetics of oxidation of [Fe(tppz)2] and [Fe(tppz)(CN)3] [5]. Inorganic Reaction Mechanisims, Vol. 6, pp. 83-89 © 2006 Old City Publishing, Inc. Reprints available directly from the publisher Published by license under the OCP Science imprint, Photocopying permitted by license only a member of the Old City Publishing Group.