Studies of mononuclear and dinuclear complexes of dibromodimethylplatinum(IV): Preparation, characterization and crystal structures

A number of complexes of the types [PtBr2Me2(N-N)] (N-N = 4,4'-di-Me-2,2'-bpy (1); 4,4'-di-t-Bu-2,2'-bpy (2); 2,2'-bpz (3); bpym (4)) and [PtBr2Me2(L)(2)] (L = H-pz (5); 4-Me-H-pz (6); H-idz (7); H-im (8); H-bim (9); quaz (10)) are reported. Characterization by NMR (H-1, C-13 and Pt-195), IR and EI-MS is given. In addition, crystal structures of several of these complexes are described. Furthermore, interactions within these structures including intramolecular hydrogen bonding and pi-pi stacking interactions are reported. The reactivity of selected mononuclear complexes was investigated and yielded two dinuclear complexes [PPh4][(PtBrMe2)(2)(mu-Br)(mu-pz)(2)] (11) and [(PtBr2Me2)(2)(mu-bpym)] (12), respectively. The latter complex is accompanied by a solid-state structure. Finally, the thermal stability of all complexes is reported. (C) 2008 Elsevier B.V. All rights reserved.