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The monoclinic polymorph of the title compound, [Pt(C4H6N2)4](ClO4)2, is reported. The two main differences between this form and the triclinic form reported previously lie in the conformation of the [Pt(C4H6N2)4]2+ cation and in the crystal packing. In both forms, the cation lies on an inversion center, but the orientations of the 1-methylimidazole (MeIm) ligands are different. In the present study, two trans-MeIm ligands are oriented perpendicular to the Pt-coordination plane, while the other two are approximately coplanar with this plane. This is the first reported instance of coplanarity in an N-alkylimidazole–platinum(II) complex. The packing of the molecular cations in the monoclinic form involves no π-stacking, in contrast with the packing observed in the triclinic form.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, I

fcf

Structure factor file (CIF format)
Contains datablock FG1141

CCDC reference: 126813

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