Use of phosphine gold acetylides [(R3P)AuCCR] to form phosphine gold derivatives of tetra-iron and penta-iron clusters

Five new gold acetylides, [AuCCR], with hydroxyl or amino functions in the organic radical R have been prepared. From these, nine phosphine complexes [(R3P)AuCCR] with R = Ph or Cy were synthesised. Reactions between the phosphine gold acetylides [(Ph3P)AuCCC(Me)(OH)Et] or [(Cy3P)AuCCC(Me)(OH)Et] and the iron carbonyl cluster [Et4N][Fe4N(CO)12] gave both neutral [(R3P)AuFe4N(CO)12] and ionic compounds [(R3P)2Au][Fe4N(CO)12]. Reaction with the penta-iron cluster [Et4N][Fe5N(CO)14] afforded [(R3P)2Au][Fe5N(CO)14], [(R3P)2Au][Fe4N(CO)12] and [(R3P)AuFe4N(CO)12]. The gold–iron clusters were characterised with spectroscopic methods (IR, NMR and Mössbauer) and in the case of [(Cy3P)AuFe4N(CO)12] a single-crystal X-ray analysis.

Nine complexes [(R3P)AuCCR′] with R = Ph or Cy and R′ containing hydroxyl or amino functions were synthesised. Reactions between [(R3P)AuCCC(Me)(OH)Et] and the iron clusters [Fe4N(CO)12]− (A) or [Fe5N(CO)14]− (B) gave [(R3P)AuFe4N(CO)12] and [(R3P)2Au][Fe4N(CO)12] from both (A) and (B) and also [(R3P)2Au][Fe5N(CO)14] from (B). The gold–iron clusters were characterised with IR, NMR and Mössbauer spectroscopies and for [(Cy3P)AuFe4N(CO)12], by a single-crystal X-ray analysis.Figure optionsDownload as PowerPoint slide