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

The crystal structure of the tetranuclear heterometallic compound [Pt2Ag2(7tpO)4(bpm)2(H2O)2](NO3)2·2H2O is described, where bpm=bipyrimidine and 7tpO− represents the anionic form of the ligand 4,7-dihydro-7-oxo-[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–Ag–(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.