HMB and Cp* ruthenium(II) complexes containing bis- and tris-(mercaptomethimazolyl)borate ligands: Synthetic, X-ray structural and electrochemical studies (HMB = η6-C6Me6, Cp* = η5-C5Me5)

The reactions of [(HMB)RuCl2]2 with K[HB(mt)3] and Na[H2B(mt)2] (mt = N-methyl-2-mercaptoimidazol-1-yl) led to the isolation of [(HMB)Ru{HB(mt)3}]Cl (1) (ca. 66% yield) and [(HMB)Ru{H2B(mt)2}]Cl (2) (ca. 70% yield), respectively. The reaction of [Cp*RuOMe]2 with Na[H2B(mt)2] yielded Cp*Ru[H2B(mt)2] (3) (ca. 85% yield). Single crystal X-ray diffraction analyses were carried out on all three complexes, together with cyclic voltammetric measurements.