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

Bioinorganic chemistry Pub Date : 1978-01-01 DOI:10.1016/S0006-3061(00)80166-0

Charles A. McAuliffe, Barry J. Sayle

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引用次数: 2

Abstract

MoOCl₃(THF)₂ (THF = tetrahydrofuran) reacts with 8-hydroxyquinoline (QH) to form [MoOCl₃(QH)₂], which contains neutral monodentate ligands, [MoOCl(Q)₂], and anionic bidentate ligands, and the dimeric [Mo₂O₃(Q)₄], which contains anionic bidentate ligands and both terminal and bridging oxo donors. In dichloromethane [MoOCl₃(QH)₂] dissolves to give three species, and epr measurements identify these as unchanged [MoOCl₃(QH)₂], [MoOCl(Q)₂] 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 significance of epr measurements as an indication of the nature of molybdenum coordination in flavoenzymes must be questioned. These complexes have also been characterised by vibrational and electronic spectral measurements.

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钼和钨的配位化学。8-羟基喹啉氧钼(V)配合物及EPR光谱与黄酶结合位点的相关性

MoOCl3(THF)2 (THF =四氢呋喃)与8-羟基喹啉(QH)反应生成[MoOCl3(QH)2]，其中含有中性单齿配体[MoOCl(Q)2]和阴离子双齿配体;二聚体[Mo2O3(Q)4]，其中含有阴离子双齿配体和末端和桥接氧给体。在二氯甲烷中，[MoOCl3(QH)2]溶解得到三种物质，epr测量确定它们为不变的[MoOCl3(QH)2]， [moocl1 (Q)2]和第三种物质，其特征值为1.979。对于不含硫供体的钼(V)配合物，以前没有获得过如此大的g值，因此必须质疑epr测量作为黄素酶中钼配位性质指示的意义。这些配合物还通过振动和电子光谱测量进行了表征。

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Bioinorganic chemistry

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