Cis–transisomerism in a square-planar platinum(II) complex bearing bulky fluorinated phosphane ligands

Abstract

Transition-metal complexes bearing fluorinated phosphane and thiolate ligands has been an area of study in recent years and the chemical context of the current work is related to the metal-assisted functionalization of fluorinated derivatives. Thecisandtransisomers of the square-planar complex bis[(pentafluorophenyl)diphenylphosphane-κP]bis(2,3,5,6-tetrafluorobenzenethiolato-κS)platinum(II), [Pt(C6HF4S)2{P(C6H5)2(C6F5)}2], have been crystallized from a single chromatographic fraction and characterized by X-ray diffraction analysis. The stabilization of thecisisomer results from weak intramolecular π-stacking interactions and possibly from the formation of a C—F...Pt contact, characterized by an F...Pt separation of 2.957 (6) Å. The natural bond orbital analysis (NBO) for this isomer confirms that the corresponding F → Pt charge transfer accounts for 6.92 kcal mol−1in the isomer stabilization. Such interactions are not present in the centrosymmetrictransisomer.