Complexes of platinum(ii) containing ferrocenylethynyl ligands: synthesis, characterization and spectroscopic and electrochemical properties†
Abstract
A series of homoleptic and heteroleptic platinum(II) complexes [Pt(CCFc)2(L-L)] (L-L = COD 1, 1,1′-bis(diphenylphosphino)ferrocene (dppf) 2), Q2[cis/trans-Pt(C6F5)2(C
CFc)2] (cis, Q = PMePh3, 3; trans, Q = NBu4, 4), (NBu4)[Pt(bzq)(C
CFc)2] 5 (Hbzq = 7,8-benzoquinoline) and (NBu4)2[Pt(C
CFc)4] 6 has been synthesized and characterized spectroscopically and the structures of 1·2CHCl3, 2 and 6·2H2O·2CH2Cl2 confirmed by single-crystal X-ray studies. The anion of complex 6, shows strong O–H⋯π(C
C) interactions and weaker C–Cl⋯π(C
C) contacts between the
Cβ of mutually cis alkynyl groups. In this complex the presence of additional O–H⋯H–C(Cp) and C–Cl⋯H–C(Cp) contacts gives rise to an extended bidimensional network. The optical and electrochemical properties of all derivatives have been examined. It is remarkable that for complexes 2 and 5 a facile oxidatively induced coupling, giving rise to 1,4-diferrocenylbutadiyne, is observed, this also having been proven by chemical