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Cis–trans isomerism in a square‐planar platinum(II) complex bearing bulky fluorinated phosphane ligands
Authors:Sylvain Berns  Francisco J Melndez  Hugo Torrens
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. The cis and trans isomers 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 the cis isomer 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−1 in the isomer stabilization. Such interactions are not present in the centrosymmetric trans isomer.
Keywords:geometric isomer  platinum  fluorinated ligands  phosphane  crystal structure  computational chemistry  NBO analysis  agostic bond
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