Molybdenum reaction with oximes

We found [44, 46, 47] that the course of the reactions of WOF4 (M0OF4) with oximes is similar to that found for secondary amines and ketimines. These data and the findings reported in [45] make it possible to present the reaction of simple oximes with tungsten or molybdenum oxotetrafluorides by the overall equation... 

Some simple oximes have been shown to act as N—O bidentates by side-on coordination of the oxime groups alone. The reaction of acetone with a hydroxylamido complex of molybdenum results in this bonding form for 2-propanone oxime.64,243 The N—O and C—N bond lengths indicate single and double bond character respectively. The reaction was related to the prebiotic formation of HCN from formaldehyde and hydroxylamido-Mo chelates. A similar form of bonding for this ligand was concluded with some fluorotungstate(IV) complexes.65... 

The group of potential 0,N-two-center ligands includes oximes (>C=N-OH), as well as hydroxylamine NH2OH, and its derivatives. The iri -coordination of simple oximes and substituted hydroxylamines in d transition metal complexes was reported almost simultaneously in Russia [9] and elsewhere [42,43]. More speciflcally, it was found [9,44,45] that the flnal product of the reaction between tungsten (molybdenum) oxotetrafluoride and simple oximes and p-phenylhydroxylamine is a complex anion with the deprotonated organic ligand [M0F4L] (where M=Mo, W HL stands for acetoxime, acetaldoxime, benzal-doxime, 2- and 4-pyridinaldoxime, and p-phenylhydroxylamine). 

Spec A = 665 nm of the titanium-methylene blue-ascorbic acid redox reaction Spec A= 420 nm of the yellow Tiron derivative (pH = 5.2 to 5.6) Spectrophotometric determination of tungsten with thiocyanate after both tungsten(VI) and molybdenum(VI) are extracted into chloroform as benzoin a-oxime complexes... 

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