Octahedral geometry molybdenum

The structures of the Cr6 core are affected by the terminal phosphine ligands. The variation of the chromium octahedra contrasts with molybdenum clusters, which always have almost regular octahedral geometry. In a crystal, the structure of a molecule is influenced by steric... 

A crystal structure determination of [pyH]4[Mo203(S04)(NCS)6] has shown the two molybdenum atoms to be bridged by one oxo and the sulfato ligand. The terminal oxygens are syn and each molybdenum has a distorted octahedral geometry.415 Persulfide bridges have been identified in several dimeric Mov complexes. In each molybdenum is... 

This conversion is a clean reactivity model for the Mo enzyme trimethylamine A-oxide reductase. The molybdenum(VI) bis(oxido) complex has a distorted octahedral geometry [181],... 

Thus far, dimensional reduction has not been applied in this way to any of the other parent solids listed in Table I. Of particular interest are systems that straddle the divide between the edge-bridged and face-centered octahedral geometries. Will reduced niobium-molybdenum halide mixtures simply disproportionate or will they lead to new mixed-metal clusters If the latter, then where does the crossover in cluster geometries occur An important factor in applying dimensional reduction is recognizing the variability in the stable electron counts within a particular cluster system. An extreme case occurs... 

Trithiolene complexes are also known, for instance those of chromium, molybdenum, and tungsten [592f], having an octahedral geometry. Structures of the complexes above, as well as of a series of other thiolene (thiol) compounds, have been studied using various physical-chemical techniques (x-ray diffraction, NMR, EPR, and UV spectroscopy). Considerable attention has been devoted to their reducing and photochemical properties [1, vol.2]. 

The X-ray crystal structure of [ MoCl(CO)2(dppmSe) 2][Mo6019] 4MeN02 was reported in 1988224 by Colton et al. The molybdenum is seven-coordinate with a slightly distorted capped octahedral geometry, with a carbonyl ligand in the unique capping position. In 1991, the molecular structure of the dibromo complex [MoBr2(CO)2(i71-dppm)(7j2-dppm)] was reported.225... 

The X-ray structure of the complex is not available, but its geometry is likely to be derived from that of the bis(diphenylphosphino) complex (j -C5H4PPh2)-Fe[(j/ -C5H4PPh2)Mo(CO)5], shown in Fig. 7-12 [49]. The molybdenum fragment possesses octahedral geometry. 

More contrasting behavior is displayed by the somewhat related molybdenum complex of l-[(dimethylamino)methyl]-2-(diphenylphosphino)ferrocene, (FcCNP)-Mo(CO)4, in which the octahedral geometry around the molybdenum atom is achievd by coordination of one P atom and one N atom of the adjacent substituents attached to a single cyclopentadienyl ring (see the sketch in Fig. 7-10). In CH2CI2, the irreversible oxidation of the molybdenum fragment precedes the reversible oxidation of the ferrocene moiety [40],... 

Reaction of bromine-activated [Mo(0)(pc)j or [MoN(pc)] with molten PPh3 yielded the molybdenum (III) complex trans [MoBr2(pc)] , which was paramagnetic jx = 3.84 BM) and had an octahedral geometry. This complex underwent pc-centered and metal-centered electrochemical oxidation. 

---