Synthesis, spectroscopic properties and crystal structure of mononuclear tricarbonylrhenium(I) chloride complexes carrying 6-functionalised quinoxalines

A series of novel 6-functionalized 2,2′-pyridylquinoxalines and their corresponding Re(CO)3Clpq complexes were synthesized by basic organic and organometallic routes. The compounds were fully characterized and the crystal structure of Re(CO)3ClPq-CH3 was elucidated. The spectroscopic data reveal the important role of the substituent at 6-position and the non equivalent role of the pyridine and quinoxaline moieties of the chelating ligand.