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.

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