Piperazine (and Derivatives) Platinum(II) Complexes: trans-Bis(N-methylpiperazine-N,N')platinum(II) Dichloride Tetrahydrate

The title compound, trans-[L₂Pt^II]²⁺.2Cl^-.4H₂O, (L = N-methylpiperazine), [Pt(C₅H₁₂N₂)₂]Cl₂.4H₂O, has been synthesized in the course of our work on complexes formed by the Pt²⁺ ion with piperazine derivatives. X-ray diffraction analysis showed that two N-methylpiperazine molecules bind one Pt²⁺ ion in such a way that the two methyl groups lie in opposite directions with respect to the Pt atom. The coordination around the Pt atom is square planar with four N atoms occupying the coordination sites, and the coordination plane is perfectly planar because the Pt atom lies on a centre of symmetry. This type of coordination imposes a boat conformation on the six-membered N-methylpiperazine ring. As found in other N-methylpiperazine complexes, the molecule has a local mirror plane coincident with the square-planar coordination plane and nearly bisecting the piperazine six-membered ring.

-1