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.