SYNTHESIS AND SPECTROSCOPIC PROPERTIES OF HETEROPOLYNUCLEAR CYANO-BRIDGED COMPLEXES

The heteropolynuclear cyano-bridged complexes [(C5H5)Fe(CO)(CNMLn)(CNM 'L'n)], {MLn = M'L'n = (C5H5)Fe(CO)(2) or W(CO)(5); MLn = (C5H5)Fe(CO) (2), M'L'n = W(CO)(5)} and mixed isocyanide complexes [(C5H5)Fe(CO)(CN MLn)(CNR)], {MLn = W(CO)(5), R = CPh3; MLn = (C5H5)Fe(CO)(2), R = CH3} have been obtained by metallation or alkylation of the two terminal C N ligands of K[(C5H5)Fe(CO)(CN)(2)]. Comparison of the bonding propert ies of the CNMLn and CNR ligands, based upon their relevant spectrosco pic data, are discussed. Furthermore, two new isomeric heterobinuclear cyano-bridged complexes of the form [(C5H5)(CO)(2)FeCNW(CO)(5)] and [ (C5H5)(CO)(2)FeNCW(CO)(5)] have been synthesized and fully characteriz ed by spectroscopic techniques. Finally the reactions with nucleophile s of the last two compounds have been also examined. (C) 1997 Elsevier Science S.A.