Molybdenum complexes tetrahedral

Finally, highly dehydroxylated alumina were prepared by heating at 800 °C under vacuum and their interaction with [Mo(CO)e] followed by infrared [19]. At room temperature, the hexacarbonyl molybdenum complex is physisorbed and the interaction of one oxygen atom of a CO ligand with defective aluminium sites (tetrahedral and octahedral sites were identified)... 

Further examples of asymmetric reactions involving chiral monoterpenoids include the formation of chiral /S-keto-sulphoxides from (-)-menthyl carboxy-lates, " synthesis of diastereomeric tetrahedral molybdenum complexes,the enantioselective hydrosilylation of ketones,and the preparation of the chiral l-amino-2-phenylethylphosphonic acids. 

AMMONIUM compounds). Diammonium dimolybdate [27546-07-2] (NH 2 2 7 " ble commercially as the tetrahydrate and prepared from MoO and excess NH in aqueous solution at 100°C, has an infinite chain stmcture based on MoO octahedra. In aqueous solution the behavior of Mo(VI) is extremely pH-dependent (4). Above pH 7 molybdenum(VI) occurs as the tetrahedral oxyanion MoO , but below pH 7 a complex series of concentration-, temperature-, and pH-dependent equiUbria exist. The best known of these equiUbria lead to the formation of the heptamolybdate,... 

Molecular recognition, calmodulin, 46 447 Mollusks, arsenic in, 44 150, 167, 168, 170 Molten salts electrolysis, 31 11 oxygen activation, 44 328-329 Molybdate ions, tetrahedral, 39 194-195 Molybdenite, 17 108 Molybdenum, 45 1 acetylene complexes of, 4 104 alkoxides... 

Tables 1 and 2 gives the numerical data for a series of vanadium (II), chromium (III), manganese (IV), molybdenum (III), rhenium (IV), iridium (VI), cobalt (II), and nickel (II) complexes. The first spin-allowed absorption band, caused by an internal transition in the partly filled shell, has the wavenumber equal to A. If spin-forbidden transitions are superposed on this band, a certain distortion from the usual shape of Gaussian error curve can be observed, and one takes the centre of gravity of intensity as the corrected wavenumber ai. One has to be careful not to confuse electron transfer or other strong bands with the internal transitions discussed here. Obviously, one has also to watch for absorption due to other coloured species, produced e. g. by oxidation or hydrolysis of the solutions. In the case of certain octahedral nickel (II), and nearly all tetrahedral cobalt (II) complexes, the first band has not actually been...

On a molecular scale these results are interpreted in the scheme shown in Fig. 11.8 [4]. For simplicity the molybdenum oxide layer is represented by a tetrahedral structure. From other results and considerations of minimal steric hindrance it is concluded that the pathway via complexes HI and VI is the dominant one. These patterns reveal the basic chemistry of sulphiding. They can be used for optimizing catalyst pretreatment in practical circumstances. 

In the ferrocenyl-carbene complex shown in Scheme 7-6, the molybdenum fragment possesses a tetrahedral geometry. It has been reported that this complex onyl undergoes a ferrocene-centred oxidation at 4-0.52 V in THF solution [47]. 

A unique homoleptic molybdenum thiolate, Mo(//r -dmpt)(dmpt)2 (388), is produced in the reaction of MoCl3(thf)3 with Li(2,6-dimesitylphenylthiolate) in diethyl ether at 0°C. The paramagnetic (/rB = 3.6), pseudo-tetrahedral complex features two monodentate thiolates, the third being bound through sulfur and 7r-arene interactions.893 The investigation of Mo111 and MoIV dithiocarbamates as oil additives and lubricant precursors continues. 

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