Singlet Diradical Complexes of Chromium, Molybdenum, and Tungsten with Azo Anion Radical Ligands from M(CO)6 Precursors. Inorganic Chemistry, (46)21:8584--8593, 2007. [PUMA: Group arylamidophenylazopyridine diradical crystal electrochem metal redox structure singlet 6 diradical;Group diradical;electronic prepn]