Preparation and crystal structures of cationic dienehydrido and dienyl ruthenium complexes containing N,N′,N″-trimethyl-1,4,7-triazacyclononane

Abstract

The reaction between [{Ru(cod)Cl₂}_n](cod = cycloocta-1,5-diene) and N,N′,N″-trimethyl-1,4,7-triazacyclononane (tacn) in ethanol–water gave [Ru(tacn)(1,2,5,6-η-cod)H]ClO₄1. When tert-butyl alcohol was used as the solvent, [Ru(tacn)(1,2,3,4,5-η-C₈H₁₁)]ClO₄2 was obtained. The Ru-H moiety in 1 is characterized by a ¹H NMR signal at δ–6.11 and a ν(Ru–H) stretch at 2040 Cm^–1. Crystal structure analysis shows that the co-ordinated cod of 1 is in the tub form, whereas complex 2 has an η⁵-cyclooctadienyl ligand.