trans -Carbonyl-chlorido-bis-(tri-ethyl-phosphane-κ P )platinum(II) tetra-fluorido-borate.

The chemical formulation of the title compound was established as trans -[PtCl{P(C 2 H 5 ) 3 (CO)}BF 4 by single-crystal X-ray analysis, in contrast to the five-coordinate tetra-fluoro-ethyl-ene complex that had been anti-cipated. The compound had been prepared by reaction of trans -PtHCl(P(C 2 H 5 ) 3 ) 2 with C 2 F 4 in the absence of air, and the presence of the carbonyl group was not suspected. The square-planar cations and BF 4 - anions are linked by C-H⋯F and C-H⋯O inter-actions into thick wavy (010) sheets. The present crystal-structure refinement is based on the original intensity data recorded in 1967.