Structures and redox properties of metal complexes of the electron-deficient diphosphine chelate ligand R,R-quinoxP. Organometallics, (27)2:218--223, 2008. [PUMA: carbonyl complex complex;electrooxidn complex;electroredn complex;palladium crystal diphosphinoquinoxaline group platinum prepn structure structure;platinum structure;rhenium]