Hydrido-complexes of molybdenum and tungsten with isonitrile and carbyne-type ligands

Abstract

Addition of acids, HX (X = BF₄, FSO₃, HSO₄, ClSO₃, Cl, or Br) to the complexes trans-[M(CNR)₂(dppe)₂](A)(M = Mo or W; R = Me, Bu^t, Ph, or C₆H₄Me-p; dppe = Ph₂PCH₂CH₂PPh₂) under carefully controlled conditions has given the hydride complexes [MH(CNR)₂(dppe)₂][X](B) and the hydrido-carbyne complexes [MH{CN(H)R}(CNR)(dppe)₂][X]₂(C). The i.r. and n.m.r. spectra of (B) and (C) are discussed with regard to their structures and compared with those of related complexes. A detailed analysis of the ³¹P spectra of these complexes and of trans-[WH(N₂)₂(dppe)₂][HCl₂] is also given.