2014 Volume 87 Issue 10 Pages 1107-1115
Both stereoisomers of the novel ruthenium complex [Ru(tpy)(pynp)(CO)]2+ containing 2,2′:6′,2′′-terpyridine (tpy), a terminal carbonyl, and the unsymmetrical bidentate naphthyridine ligand 2-(2-pyridyl)-1,8-naphthyridine (pynp) were selectively synthesized. In addition, two more ruthenium complexes [Ru(ptpy)(pynp)(CO)]2+ containing 4′-phenyl-2,2′:6′,2′′-terpyridine (ptpy) instead of tpy were also prepared. These complexes were fully characterized and their molecular structures were determined by X-ray crystallography. Some obvious differences between the isomers were revealed by the structural, computational, and spectroscopic results. Furthermore, redox properties and carbonyl ligand-based reactions of these four complexes were examined to evaluate the steric and electronic effects of the other ligands on the carbonyl reactivity. Both effects, based on the structural differences, exerted a large influence on the reactivity.
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