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Molybdenum complexes crystal structures

However, when the X-ray crystal structure of the MoFe protein was examined, it was clear that homocitrate could not directly hydrogen bond to the histidine, since the carboxylate group and imidazole are stacked parallel to each other in the crystal. Nevertheless, as noted in the previous section, studies on model complexes have suggested that homocitrate can become monodentate during nitrogenase turnover, with the molybdenum carboxylate bond breaking to open up a vacant site at molybdenum suitable for binding N2. [Pg.201]

N-Donor Ligands. The full account of the crystal structure of [Mo02(8-hydroxyquinolate)2] has been published. The dimensions of the M0O2 unit are O—Klo—O = 104.C and Mo—O = 171(2) pm. The electrochemistries of this and the related molybdenum(v) complex. [ MoO(8-hydroxyquino-late)2 2 0], have been investigated as simple models of molybdenum-fluoro-protein enzymes (p. 146). Reduction of the molybdenum(vi) complex occurs in two one-electron steps with solvent attack of the reduced intermediates and displacement of the 8-hydroxyquinolato-groups. ... [Pg.158]

The formation of a monomeric amidino complex has been reported for the reaction of rhenium pentachloride with di-isopropylcarbodiimid. A composition of [ReCl4(prop 2N2CCI)] was derived from elemental analysis, spectroscopic data and the crystal structure of the molybdenum analogue. " ... [Pg.332]

The possibility of this binding mode was shown recently with the synthesis and structural analysis of the dumbbell-shaped bis-fullerene complexes of molybdenum and timgsten. The X-ray crystal structure proves the (71 -0 0)21 1 binding mode (Figure 7.9) [87]. [Pg.247]

Oxo complexes dominate the chemistry of molybdenum in its higher oxidation states,5 80,92 93 and play a major role in the catalytic activity of molybdenum in biological systems (see Section 36.6.7). MoIV complexes have been characterized containing the monooxo (MoO 2+ and the trans-dioxomolybdenum(IV) Mo02 cores, but no compound has been isolated analogous to the ds-dioxomolybdenum(VI) species described in Section 36.5. Crystal structure determinations have been accomplished for a number of MoIV complexes, and some typical examples are listed in Table 3.80... [Pg.1335]

The reaction between [MoCl4(NCPr)2] and dithiocarboxylic acids is a general route to the preparation of eight-coordinate [Mo(S2CR)4] complexes.168 The crystal structure of [Mo(S2CPh)4] reveals these compounds to be isostructural with the dithiocarbamates, with a dodecahedral coordination around the molybdenum and average Mo—S distances of 2.475(1) and 2.543(1) A to the two different sulfur sites.170 Cyclic voltammetry has shown that in [Mo(acda)4] (Hacda = 2-aminocyclopent-l-ene-l-dithiocarboxylic acid) the Mo can be reversibly oxidized and reversibly reduced in one-electron processes.171... [Pg.1343]

A number of isocyanide complexes, [Mo(CN)4(CNR)4] (R = Me, Pr, Bu allyl, NCPh2), have been made by the action of RI on Ag4[Mo(CN)8]. The crystal structure of [Mo(CN)4(CNMe)4] shows a dodecahedral geometry, with the CN- ligands at 2.177(8) A and the MeNC ligands at 2.148(8) A from the molybdenum.207 Both 13C NMR and vibrational spectroscopy indicate that only one isomer is present in solution. [Pg.1345]


See other pages where Molybdenum complexes crystal structures is mentioned: [Pg.305]    [Pg.3172]    [Pg.3193]    [Pg.231]    [Pg.127]    [Pg.127]    [Pg.54]    [Pg.199]    [Pg.609]    [Pg.619]    [Pg.26]    [Pg.169]    [Pg.164]    [Pg.37]    [Pg.41]    [Pg.21]    [Pg.141]    [Pg.143]    [Pg.145]    [Pg.152]    [Pg.147]    [Pg.1059]    [Pg.206]    [Pg.1059]    [Pg.157]    [Pg.158]    [Pg.145]    [Pg.348]    [Pg.18]    [Pg.1333]    [Pg.1333]    [Pg.1336]    [Pg.1341]    [Pg.1342]    [Pg.1342]    [Pg.1343]    [Pg.1343]    [Pg.1345]    [Pg.1348]    [Pg.1349]    [Pg.1350]    [Pg.1353]   
See also in sourсe #XX -- [ Pg.1336 ]

See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.476 , Pg.1336 ]




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