Salts of cationic platinum dithiolenes with anionic platinum complexes: structural characterization of [Pt(Me2pipdt)2][Pt(SCN)4] (Me2pipdt = N,N′-dimethyl-piperazine-2,3-dithione)
摘要:
[Pt(Me(2)pipdt)(2)](BF4)(2) salts [Me(2)pipdt = N,N'-dimethyl-piperazine-2,3-dithione] bearing cationic dithiolene complexes react with (Bu4N)(2)[Pt(X)(4)] (X = SCN, CN) to form [Pt(Me(2)pipdt)(2)][Pt(SCN)(4)] (1) and [Pt(Me(2)pipdt)(2)][Pt(CN)(4)] (2) salts by metathesis. Black crystals of 1 have been structurally characterized showing that the two metals lie on inversion centers and exhibit a square planar coordination. The Pt-S bond distances in the anion complex (2.324(2) Angstrom) are longer than in the cation complex (2.280(2) Angstrom) whereas the C-S bond distances are shorter in SCN- (average 1.669 Angstrom) than in Me(2)pipdt (average 1.694 Angstrom). The chelating Me(2)Pipdt ligand is found disordered in the lambda/delta conformations with site occupancies of 50/50. respectively. The cation and anion complexes run parallel to a. (C) 2003 Elsevier B.V. All rights reserved.