Neutral dinuclear gold(I) complexes having general formula [Au2Cl2(NHCP)] (NHCP = N-phosphanyl N-heterocyclic carbene) have been synthesized by two different synthetic procedures: i) transmetalation of the NHCP ligand from the corresponding dinuclear silver(I) complex; ii) deprotonation of the corresponding N-phosphanyl azolium/tetrahydropyrimidinium salt in the presence of the gold(I) precursor. Interestingly, although the silver complexes are invariably dinuclear dicationic species of formula [Ag2(NHCP)2](OTf)2, both stoichiometries [Au2(NHCP)2](OTf)2 and [Au2Cl2(NHCP)] are potentially accessible with gold. Preference for either stoichiometry is dictated by the steric properties of the NHCP ligand as well as by a proper choice of the experimental conditions. On the other hand, preparation of copper(I) compounds with [Cu2Cl2(NHCP)] stoichiometry leads to product mixtures and has not led up to now to pure neutral compounds. Both the silver(I) and gold(I) complexes have been structurally characterized.
Neutral dinuclear gold(I) complexes with N-phosphanyl, N-heterocyclic carbenes (NHCPs) / Marchenko, Anatoliy; Koidan, Georgyi; Hurieva, Anastasiya; Vlasenko, Yurii; Kostyuk, Aleksandr; Lenarda, Anna; Biffis, Andrea; Tubaro, Cristina; Baron, Marco; Graiff, Claudia; Nestola, Fabrizio. - In: JOURNAL OF ORGANOMETALLIC CHEMISTRY. - ISSN 0022-328X. - 829(2017), pp. 71-78. [10.1016/j.jorganchem.2016.09.030]
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