A New Homobimetallic Arenediyl Diplatinum(II) Unit as Building Block for Macromolecular Synthesis. X-ray Crysal Structure of [C6H2{CH2NMe2}2-1,5-{PtCl(PPh3)}2-2,4]

Abstract

Treatment of the diaminobenzene [C{6}H{4}{CH{2}NMe{2}}{2}-1, 3] (NCN-H, 1) with one or two equivalents of cis-PtCl{2}(DMSO){2} leads to exclusive formation of the doubly cycloplatinated species [C{6}H{4}{CH{2}NMe{2}}{2}-1,5-{PtCl(DMSO)}{2}-2,4] (3), which upon addition of triphenylphosphine yields the bisphosphine adduct [C{6}H{4}{CH{2}NMe{2}}{2}-1,5-{PtCl(PPh{3})}{2}-2,4] (4). The X-ray molecular structure of 4 revealed the presence of highly distorted square planar Pt(II) centers which is caused by close proximity of the two phosphine donor ligands. Complexes of type 3 can be regarded as suitable starting materials for the directional build-up of larger macromolecular structures.