Dependence of the product on the P–P ligand in reactions of [RuCl3(NO)(P–P)] complexes (P–P = aromatic diphosphines) with 2-mercaptopyridine

This study presents the syntheses and characterization of 2-mercaptopyridine (pyS−) complexes containing ruthenium(II) with the following general formula [Ru(pyS)2(P–P)], P–P = (c-dppen) = cis-1,2-bis(diphenylphosphino)ethylene) (1); (dppe) = 1,2-bis(diphenylphosphino)ethane (2); (dppp) = 1,3-bis(diphenylphosphino)propane (3) and (dppb) = 1,4-bis(diphenylphosphino)butane (4). The complexes were synthesized from the mer- or fac-[RuCl3(NO)(P–P)] precursors in the presence of triethylamine in methanol solution with dependence of the product on the P–P ligand. The reaction of pyS− with a ruthenium complex containing a bulky aromatic diphosphine dppb disclosed a major product with a dangling coordinated dppbO-P, the [Ru(pyS)2(NO)(η1-dppbO-P)]PF6(5). In addition, this work also presents and discusses the spectroscopic and electrochemical behavior of 1–5, and report the X-ray structures for 1 and 5.

Graphical abstractThe syntheses and characterization of 2-mercaptopyridine (pyS−) complexes containing ruthenium(II) with general formula [Ru(pyS)2(P–P)], P–P = aromatic diphosphine, and [Ru(pyS)2(NO)(η1-dppbO-P)]PF6 are presented in this work. The complexes were synthesized from the mer- or fac-[RuCl3(NO)(P–P)] precursors with dependence of the product on P–P ligandFigure optionsDownload full-size imageDownload as PowerPoint slide