Coordination chemistry of molybdenum and tungsten—VIII. Oxomolybdenum(V) complexes of 8-hydroxyquinoline and relevance of EPR spectra to binding sites in flavoenzymes

✍ Scribed by Charles A. McAuliffe; Barry J. Sayle

• Book ID: 104105946
• Publisher: Elsevier Science
• Year: 1978
• Weight: 437 KB
• Volume: 8
• Category: Article
• ISSN: 0006-3061
• DOI: 10.1016/s0006-3061(00)80166-0

✦ Synopsis

MoOCl3(THF)2 (THF = tetrahydrofuran) reacts with 8-hydroxyquinoline (QH) to form [MoQCI~(QH)~], which contains neutral monodentate ligands, [MoOCl(Q)~] ) and anionic bidentate l&rids, and the dimeric [M0203(Q)4], which contains anionic bidentate ligands and both terminal and bridging 0x0 donors. In dichloromethane [MoOC&(QH)Z] dissolves to give three species, and epr measurements identify these a~ unchanged [MoOCl8(QH)2], [MoOCI(Q)~] and a third species characterised by a value of 1.979. No g value of this magnitude has previously been obtained for molybdenum(V) complexes which do not contain sulphur donors, and the si_enificance of epr measurements as an indication of the nature of molybdenum coordination in flavoeuzymes must be questioned. These complexes have also been characterised by vrbrational and electronic spectral measurements.