Abstract
The title compound [PtCl2(C4Me4)(SbPh3)] (1) crystallizes from methylene chloride/n-hexane in the monoclinic space group P21/n with lattice constants a = 8.303(1) Å, b = 17.378(2) Å, c = 17.640(2) Å, β = 90.86(1)°, Z = 4. The crystal structure was solved by the heavy atom method. The refinement converged to a final wR2 = 0.051 for 4310 reflections (R1 = 0.024 for 3810 observed reflections). In the solid state the exactly planar cyclobutadiene ligand is asymmetrically coordinated with respect to the Pt atom having two shorter and two longer Pt – C bonds (Pt – C distances in the range 2.105(4) Å – 2.195(5) Å). The methyl carbon atoms show a remarkable difference concerning the bend out of the C4 plane, away from the Pt atom (out-of-plane displacement in the range of 0.083(6) Å to 0.401(6) Å). The Pt – Sb bond length amounts to 2.5911(4) Å. The Pt – Cl bonds in 1 are longer than those in the corresponding stibine-free complex [PtCl2(C4Me4)] (2) (2.449(1) Å/2.458(1) Å vs. 2.338(2) Å/2.323(3) Å). This corresponds to a low-frequency shift of the (PtCl) stretching and deformation modes in 1 compared to that observed in 2.
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München