Abstract
Recent applications of 18O transfer and kinetic exchange experiments coupled with X-ray crystal structures has led to the establishment or confirmation of aqueous structures of some aqueous molybdenum ions. The mechanisms by which molybdenum-coordinated OH 2, OH − and O 2− are exchanged with solvent are not well-understood. Now there are several ions which have been carefully studied and some suggestions as to mechanism can be made. A summary of oxygen transfer and kinetic exchange studies is made for the aquo ions MoO 2− 4, Mo 2O 2+ 4, Mo 3O 4(OH 2) 4+ 9 and several of their complexes. Interpretation of oxygen transfer accompanying reduction to lower oxidation states gives some structural and kinetic information about the reduced ion. Some new data are presented on complexes of these oxidation states which allow an estimate of the rate behavior of oxo and bridged-hydroxo groups in the neutral and basic region not accessible with the uncomplexed aquo ion.
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