Ruthenium carbonyl cluster complexes with nitrogen ligands. II. Syntheses, X-ray structures and interconversion...

Abstract

Title full: Ruthenium carbonyl cluster complexes with nitrogen ligands. II. Syntheses, X-ray structures and interconversion of Ru3(μ-H)(μ-η2-NC5H 8)(CO)10 and RU3(μ-H)(μ3-η2-NC5 H8)(CO)9. The reaction between piperidine and Ru3(CO)12 in refluxing tetrahydrofuran gave the title compounds Ru3(μ-H)(μ-η2-NC5H8 )(CO)10 (1) and Ru3(μ-H)(μ3-η2-NC5 H8)(CO)9 (2), both of which have been characterized by means of X-ray diffraction studies, with location and refinement of the core hydrogen atoms. Analysis of the cluster core distances for 1, 2 and related structures suggests that there is substantially more NC weakening for μ3-η2- compared to μ-η2-coordination. Interconvertibility of 1 and 2 has been demonstrated. Mild thermolysis cleanly converted 1 into 2; the reverse reaction could be quantitatively effected by carbonylation at room temperature. Hydrogenation of 2 effected the elimination of the μ3-η2-piperidyl ligand. Show more