Synthesis and characterisation of new platinum ethynyl dimers and polymers with pendant ferrocenyl groups

Abstract

The square-planar platinum(II) complex trans-[(Ph 2FcP) 2PtCl 2] ( 1) (Fc=ferrocenyl), that is a metal-containing polymer precursor, has been synthesised and its single crystal structure determined. Using 1, new ferrocene-containing platinum ethynyl dimers trans-[(Ph 2FcP) 2Pt(CCR) 2] {R=SiMe 3 ( 2), C 6H 5 ( 3) and C 6H 4- p-NO 2 ( 4)} and a polymer [(Ph 2FcP) 2Pt(CCC 6H 2- p-(OC 8H 17) 2CC)] n ( 5) have been formed by the reaction of the metal precursor with the appropriate mono- and bis-ethynyl ligands. Single crystal X-ray studies of 4 have shown it to exist as two different polymorphic forms, both having trans-geometry with respect to the ferrocenyl phosphines and ethynyl ligands. GPC measurements on the polymer show a high degree of polymerisation with an average molecular weight of ca. 88 000.