Chelate-stabilised tetrahydrofuran complexes of platinum(II). Crystal structure of [PtCl(Ph2PCH2C4H7O)(Ph2PCH2C4H7O)][PF6]

Abstract

The platinum(II) complexes cis- and trans-[PtCl₂(PPh₂CH₂[graphic omitted])₂](2) and (3) are described. The cis isomer (2) reacts with K[PF₆] to give the monochelate cis-[[graphic omitted])-(Ph₂PCH₂[graphic omitted])[PF₆](4a). Complex (2) also reacts with AgClO₄ to give the bis chelate cis-[[graphic omitted])₂][ClO₄]₂(5a). The tetrahydrofuran (thf) complexes (4a) and (5a) are compared with closely related alcohol and linear ether complexes and it is deduced that the trans influence of the neutral O-donors is in the order ROH > thf > R₂O. The X-ray structure (R= 0.039 for 5 730 diffractometer observed reflections) of complex (4a) confirms the structural assignment; the Pt–O bond length [2.142(4)Å] is somewhat longer than found for covalent Pt–O bonds.