Synthesis and ligand properties towards gold and silver of the ferrocenylamidobenzimidazole ligand
作者:Maria José Calhorda、Paulo J. Costa、Paulo N. Martinho、M. Concepción Gimeno、Antonio Laguna、Susana Quintal、M. Dolores Villacampa
DOI:10.1016/j.jorganchem.2006.06.025
日期:2006.10
The treatment of FcCOCl (Fc = (C5H5)Fe(C5H4)) With amino benzimidazole in 1: 1 or 2:1 ratio gives the ferrocenyl-amido derivatives FcCO(benzimNH(2)) or (FcCO)(2)(NHbenzim), respectively. The reactivity of FcCO(benzimNH(2)) with silver or gold complexes has been studied. The reaction with the basic gold compounds [Au(acac)(PPh3)] or [O(AuPPh3)(3)]ClO4 occurs with deprotonation of the NH2 group and coordination of one or three gold(phosphine) fragments. The treatment of this ligand with silver compounds, such as Ag(OTf) or [Ag(OTf)(PPh3)], gives the complexes of stoichiometry [Ag(OTf)L] or [Ag(OTf)(PPh3)]. The ligand FcCO(benzimNH(2)) and the complex [Ag(OTf)FcCO(benzimNH(2))}(PPh3)] have been characterized by X-ray diffraction studies. DFT calculations were performed on models of this dimeric silver complex and showed that dimerization is energetically favourable, because Ag(I) achieves a four coordination environment, despite some bonds being relatively weak. (c) 2006 Elsevier B.V. All rights reserved.