Geometrical isomerism in 2-hydroxypyridinate and pyridine-2-thiolate complexes derived from the ruthenium(IV) bis(allyl) dimer [{Ru(η3: η3-C10H16)Cl(µ-Cl)}2]

Abstract

Reaction of the ruthenium(IV) chloro-bridged dimer [{Ru(η³: η³-C₁₀H₁₆)Cl(µ-Cl)}₂] with a range of 2-hydroxypyridinate and pyridine-2-thiolate ligands (HL = 2-hydroxypyridine, 6-chloro-2-hydroxypyridine, 2-hydroxy-6-methylpyridine,2-hydroxy-4-methylquinoline,8-hydroxyquinoline,pyrrolidin-2-one,quinoline-2-thiol and 6-methylpyridine-2-thiol) gives the neutral, chelate compounds [Ru(η³: η³-C₁₀H₁₆)Cl(L)] each of which exists as both axial and equatorial geometric isomers. These isomers occur in varying ratios and may be distinguished by their characteristic ¹H NMR spectra. The X-ray crystal structures of eq-[Ru(η³: η³-C₁₀H₁₆)Cl{NC₆H₃(O)Cl-6}] and of eq-[Ru(η³: η³-C₁₀H₁₆)Cl(NC₉H₆S)] are reported.