Cyano-bridged Fe-CN-Pt-NC-Fe chain complexes:: structural and spectroscopic characterization of four isomers of [{η5-(1-phenylborole)Fe(CO)2(μ-CN)}2Pt(PEt3)2]

The cyanometalate [eta(5)-(1-phenylborole)Fe(CO)(2)CN](-) is used as a building block for the synthesis of heterometallic complexes. It reacts with platinum(II) precursors with formation of cyanide-bridged Fe/Pt complexes and various isomeric structures are observed depending upon the orientation of the CN ligand (linkage isomers Fe-(mu-CN)-Pt or Fe-(mu-NC)-Pt) and the cis or tl ans geometry around the platinum centre. Complex 7 with a Fe-(mu-NC)-Pt-(mu-CN)-Fe chain was obtained from the reaction of trans-[Pt(CN)(2)(PEt3)(2)] with [eta(5)-(1-phenylborole)Fe(CO)(2)(OEt2)]. The crystal structure of cis-[{eta(5)-(1-phenylborole)Fe(CO)(2)(mu-CN)}(2)Pt(PEt3)(2)] (2) which contains a Fe-(mu-CN)-Pt-(mu-NC)-Fe chain has been determined by X-ray diffraction. (C) 1998 Elsevier Science S.A. All rights reserved.