Platinum(II) Complexes of Piperazine (and Derivatives): trans-Dichlorobis(N-methylpiperazine-N')platinum(II)

The neutral title complex, trans-[PtCl2(C5H12N2)2], has been synthesized in the course of our studies on piperazine derivative complexes with platinum(II). This complex is square-planar and isomorphous with the analogous palladium(II) complex, and exhibits the same molecular, but not crystallographic, structure as trans-[PtCl2(C5H13N2)2]Cl2.2H2O, [(C5H13N2) is N-methylpiperazinium(+1)]. The six-membered ring is in the chair conformation and binds platinum(II) through the unmethylated N1—H nitrogen, which is sterically less hindered than the methylated one. The molecule has a local pseudo-mirror plane nearly coincident with the square-planar coordination plane and nearly bisecting the piperazine ring.