|
|||||
|
|
Synthesis and ligand properties towards gold and silver of the ferrocenylamidobenzimidazole ligand |
|
| Authors: | Maria José Calhorda,Paulo J. Costa,Paulo N. Martinho,M. Concepció n Gimeno,Antonio Laguna,M. Dolores Villacampa |
| Affiliation: | a Instituto de Tecnologia Química e Biológica (ITQB), Av. da República, EAN, Apt 127, 2781-901 Oeiras, Portugal b Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal c Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, E-50009 Zaragoza, Spain |
| Abstract: | The treatment of FcCOCl (Fc = (C5H5)Fe(C5H4)) with aminobenzimidazole in 1:1 or 2:1 ratio gives the ferrocenyl-amido derivatives FcCO(benzimNH2) or (FcCO)2(NHbenzim), respectively. The reactivity of FcCO(benzimNH2) 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)L]. The ligand FcCO(benzimNH2) and the complex [Ag(OTf){FcCO(benzimNH2)}(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. |
| Keywords: | Gold Silver Ferrocene derivatives DFT calculations Azolate ligands |
| 本文献已被 ScienceDirect 等数据库收录！ | |