Palladium(II) and platinum(II)η3-methylallyl trichlorotin complexes. Part 3. Crystal structure analysis of [Pt(η3-C4H7)(cod)]2[Pt(η3-C4H7)(SnCl3)3](cod = cyclo-octa-1,5-diene)

Abstract

The dimer [{Pt(η³-C₄H₇)Cl}₂] reacts with cyclo-octa-1,5-diene (cod) and SnCl₂ to give [Pt(η³-C₄H₇)(cod)]₂[Pt(η³-C₄H₇)(SnCl₃)₃](1). The compound crystallizes as discrete anionic and cationic platinum(II) complexes in space group P with a= 13.256(4), b= 19.960(4), c= 8.615(3)Å, α= 101.75(2), β= 104.69(2), and γ= 86.62(2)°. The anionic complex displays a distorted square-pyramidal co-ordination while the two isostructural cations have irregular square-planar co-ordination. Analysis of bond distances using SnCl₃ as a probe suggests that the trans influence of the methylallyl ligand is comparable to that of olefin ligands. While no n.m.r. data are available for (1) due to its very poor solubility, n.m.r. results for the palladium(II) analogue (2) obtained by the same synthetic route are compatible with the structure determined for (1).