Abstract
This chapter reviews those well understood structural and spectroscopic parameters that are at present or may in the future be relevant to the process of structural and mechanistic elucidation of the molybdenum sites in enzymes. The molybdenum sites at present are found to be of two fundamentally different types. By far, the greatest amount of structural information about enzymic Mo sites has been provided by the techniques of electron paramagnetic resonance spectroscopy and X-ray absorption spectroscopy, including especially the analysis of extended X-ray absorption fine structure. X-ray absorption spectroscopy is likely to assume a central position in future structural study of Mo enzymes and is applicable to biometallic molecules. Although only one bond or grouping in any given complex may be similar to that of the enzyme, a dissection of the Mo enzyme site as guided by the properties of these compounds can bring insight into the nature of that site and the teleonomy of its choice by the enzyme.
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