2 FORMS OF CIS-DIMETHYLBIS-(METHYL-ISOCYANIDE)PLATINUM(II)

The compound [Pt(CH3)2(C2H3N)2] crystallized in two different space gr oups [orthorhombic, (1), and monoclinic, (2)] depending on the solvent used. The structures were solved by single-crystal X-ray diffraction analyses. In both structures, the stereochemistry at Pt(II) is cis squ are planar. The Pt-C(methyl) distances are 2.066 (7) and 2.078 (8) ang strom in (1) and 2.07 (3) and 2.06 (2) angstrom in (2), and the Pt-C(i socyanide) distances are 1.979 (8) and 1.953 (7) angstrom in (1) and 1 .96 (2) and 2.02 (3) angstrom in (2). The difference in the quality of these two structure determinations appears to have stemmed from a poo r absorption correction resulting from the cut faces and platy nature of the crystal of (2).