The crystal and molecular structure of a cis dimetalated complex of platinum(II).

A cycle dimetalated complex of Pt(II), [Bz,(C,- H4CHJP],Pt, can be prepared from (q3-2-methylallylPtOAc), and PBz3. The X-ray structure determination of this complex is reported here. The crystals are triclinic (space group Pi) with a = l&536(2), b = 10.500(l), c = 10.053(l) i$ (Y = 90.27(I), B = 95.16(3), 7 = 83.84(2) deg, Z = 2, d, = 1.54 g cmS3. The structure was solved by Patterson and Fourier methods and refined by 1.~. methods to a conventional R factor of 0.035, based on 4769 intensities above background. The molecule, of approximate C2 symmetry, shows a distorted square planar geomem, the metal atom being coordinated to two phosphonrs atoms cis to each other and to two ortho carbon atoms of two phenyl rings again in mutual cis relation. The phosphines thus act as chelating ligands and the resulting jive-membered Pt-P--Lxx rings are puckered. The mean Pt-P and Pt&C distances are 2.2 77(2) and 2.06 7( 7) A respectively and the P-Pt-P angle is 106.0(1)°.