Multimetallic systems composed of CpFe(CO)2-, Cp2Re- and (RCO2)2Bi- moieties

Abstract

The reaction of [Fp]2 (Fp = (η5-C5H5)(CO)2Fe) with bismuth formate was shown to proceed via Fe-Bi bond formation yielding [Fp–Bi(O2CH)2]n, 1, that could be crystallized in form of two polymorphs. These differ in the way the [Fp−Bi(O2CH)2] units are connected via bridging formate ligands to yield the respective coordination polymers. The acetate derivative [Fp–Bi(O2CCH3)2] was used as a precursor compound targeting at the construction of an additional transition metal-bismuth bond: the reaction of [Fp–Bi(O2CCH3)2] with [Cp2ReH] likely yields in the envisaged complex [Fp−Bi(O2CCH3)ReCp2] first but then undergoes further transformation due to the presence of chloride and acetic acid in solution, which lead to the formation of [Fp−Bi(Cl)ReCp2], 3, and [Cp2Re–Bi(O2CCH3)2], 4, respectively. The identity of the heterotrimetallic compound 3 was established by a single-crystal X-ray diffraction analysis, while an independent synthetic route (reaction of [Cp2ReH] with [Bi(O2CCH3)3]) was developed for 4 in order to unambiguously identify 4 also as the product of the reaction between [Fp–Bi(O2CCH3)2] and [Cp2ReH].