The coordinated diazine ring of qx is significantly inclined with respect to the Pt(II) coordination planes.
As a continuation of our interest in the reactions between methionine- and histidine-containing peptides and dinuclear Pt(II) complexes with six-membered aromatic diazines as bridging ligands, in the present study, we describe synthesis and characterization of three new dinuclear platinum(II) complexes, [[{Pt(en)Cl}.sub.2]([mu]-qx)][Cl.sub.2] x 2[H.sub.2]O (1), [[{Pt(en)Cl}.sub.2]([mu]-qz)][(Cl[O.sub.4]).sub.2] (2), and [[{Pt(en)Cl}.sub.2]([mu]-phtz)] [Cl.sub.2] x 4[H.sub.2]O (3) (qx = quinoxaline, qz = quinazoline, phtz = phthalazine, and en = ethylenediamine).