Structure of a tetranuclear heterometallic Ag(I)-Pt(II) complex with a triazolopyrimidine derivative

The crystal structure of the tetranuclear heterometallic compound [Pt2Ag2(7 tpO)(4)(bpm)(2)(H2O)(2)](NO3)(2). 2H(2)O is described, where bpm = bipyrimi dine and 7tpO(-) represents the anionic form of the ligand 4,7-dihydro-7-ox o-[1,2,4]-triazolo-[1,5-a]-pyrimidine. The complex cation in this compound includes two platinum and two silver atoms forming a -Ag-(7tpO)(2)-Pt-bpm-A g-(7tpO)(2)-Pt-bpm- cyclic species. The bridging ligand 7tpO binds platinum and silver through the nitrogen atoms in positions 3 and 4. respectively, whereas each bipyrimidine moiety is also linked to a platinum and a silver atom, each atom being coordinated by the two nitrogen atoms of one ring of this ligand. (C) 2001 Elsevier Science B.V. All rights reserved.