Add time:08/02/2019         Source:sciencedirect.com

Spectroscopic and crystallographic studies show that 2-(N-(2-pyridyl)carbamoyl)pyridine (HL) in both its neutral and deprotonated forms, coordinates ruthenium(II) via the amidato- and pyridine-nitrogen atoms thereby forming five-membered rings. In neutral [Ru(HL)(PPh3)2Cl2], HL exists as a zwitterion and the molecular structure is stabilised, in part, by an intramolecular Cl⋯N interaction. Reaction of the title complex with bidentate chelating ligands leads to the replacement of two chlorides by the bidentate ligands, resulting in the formation of the mixed-ligand complexes. There is deprotonation of the zwitterionic HL in the mixed-ligand complexes.

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