STRUCTURE OF LCYCLOBUTADIENE)PLATINATE(II)TRIS(DICHLOROMETHANE) SOLVATE, [K(18C6)][PTCL3(C4ME4)]CENTER-DOT-3CH(2)CL(2)

The title compound [K(18C6)][PtCl3(C4Me4)] .3 CH2Cl2 (1), C23H42C19KO6 Pt, crystallizes from methy lene chloride/n-hexane in the monoclinic s pace group Cc with lattice constants a = 17.346(3) Angstrom, b = 12.07 4(2) Angstrom, c = 17.937(4) Angstrom, beta = 94.74(3)degrees, Z = 4. The crystal struc ture was solved by the heavy atom method. The refine ment converged to final wR2 = 0.113 for 3710 reflections (R1 = 0.046 f or 3133 observed reflections). Compound (1) represents the first struc turally characterized anionic (cyclobutadiene)platinum(II) complex. Ap art from some weak hydrogen bond interactions, (1) consists of discret e molecules [K(18C6)][PtCl3(C4Me4)] with close cation-anion contacts ( K...Cl 3.097 Angstrom-3.482 Angstrom) and dichloromethane molecules. T he Pt-Cl distances are almost of the same length (2.445 Angstrom-2.455 Angstrom), while the Pt-C distances are in the range from 2.08 Angstr om-2.19 Angstrom. The cyclobutadiene ring is planar and the C-C-C bond angles range from 87(1)degrees-93(1)degrees.