Complexes of the platinum metals. Part 42. Binuclear N,O-succinimido-bridged ruthenium(II) derivatives: crystal structure of [Ru2(µ-Cl)(µ-H)(µ-C4H4NO2)2(PPh3)4]·2CH2Cl2·0.5H2O

Abstract

Succinimide reacts with [RuHCl(PPh3)3] in refluxing toluene to afford a maroon air-stable complex 1. A crystal of 1 obatained from CH2Cl2–MeOH solution has been shown by X-ray diffraction methods to possess the succinimido-bridged structure [Ru2(µ-Cl)(µ-H)(µ-C4H4NO2)2(PPh3)4]·2CH2Cl2·0.5H2O. Succinimide also reacts with [RuCl2(PPh3)3] in refluxing toluene in the presence of an excess of NEt3 to form a closely related monocarbonyl derivative [Ru2(µ-Cl)(µ-H)(µ-C4H4NO2)2(CO)(PPh3)3]2 as orange needles. Carbonylation of 2 in refluxing toluene affords the dicarbonyl [Ru2(µ-Cl)(µ-H)(µ-C4H4NO2)2(CO)2(PPh3)2]3 as pale yellow crystals. The products 1–3 have been characterised by infrared and 1H and 31P-{1H} NMR spectroscopies.