cis-1,3,5-Triaminocyclohexane as a Facially Capping Ligand for Ruthenium(II)

Reaction of cis-[RuCl2(DMSO-S)3(DMSO-O)] with cis-1,3,5-triaminocyclohexane (tach) results in the formation of [RuCl­(tach)­(DMSO-S)2]­Cl, a valuable precursor for a wide range of other tach-containing Ru complexes. Reaction of [RuCl­(tach)­(DMSO-S)2]Cl with the chelating nitrogen-based ligands (N–N = bipyridine, phenanthroline, and ethylenediamine) affords [Ru­(N–N)­(DMSO-S)2(tach)]­[Cl]2. A similar reaction between [RuCl­(tach)­(DMSO-S)]Cl with the chelating phosphorus-based ligands (P–P = dppm, dppe, dppp, dppb, dppv, and dppben) leads to the formation of [RuCl­(P–P)­(tach)]­Cl. The structures of 10 examples of the tach-containing complexes have been determined by single crystal X-ray diffraction. An examination of the structural metrics obtained from these studies indicates that the tach ligand is a strong sigma donor. In addition, the presence of the NH2 groups in the tach ligand allow for participation in hydrogen bonding further modulating the coordinative properties of the ligand.