Oxygen-metal bond distances

Sodium Acetate Complexes of U(VI), Np(VI), Pu(VI) and Am(VI). A Comparison of Metal Oxygen Bond Distance and Bond Force Constant in this Series. Report AECU-3088 (1954). J- chem. Phys. 23, 2105 (1955). 

In an effort to more fully elucidate the structure and reactivity of metal oxide pillared clays, we have been investigating the structure-reactivity properties of chromia-pillared derivatives (17). In the following sections, we provide an example of the structure-catalytic reactivity properties of chromia-pillared montmorillonites. Also, we report our initial efforts to structurally characterize the intercalated chromia aggregates by Extended X-ray Absorption Fine Structure (EXAFS) Spectroscopy. Unlike previously reported metal oxide pillared clays, chromia-pillared clay exhibits strong K-edge absorption and fine structure suitable for determination of metal-oxygen bond distances in the pillars. 

The theoretical parameters characterizing Ir4 in zeolite NaX (Fig. 3) indicate Ir-O distances of about 2.2 A, in good agreement with EXAFS data (Ferrari et al., 1999) and approximately equal to the metal-oxygen bond distances found experimentally and theoretically for supported metal complexes, as discussed above. When the structure of Fig. 3 is rotated 60°, the theory indicates an Ir-O distance of about 2.7 A, in agreement with the longer distances observed by EXAFS spectroscopy (but this agreement may be fortuitous). 

Because of the higher charge and polarizing power of Ce4+ ion the metal-oxygen bond distances in its complex are shorter than the M-O bond distances in the Ce(III) nitrato complex. 

Metal-oxygen bond distances in solid lanthanide hydrates. 

The 0X0 cluster 30a has also been used to prepare a handful of metal complexes. The aluminium complex 46 was obtained in 81% yield from the reaction of 30a with 1.5 equivalents of AlMes no coordination to the tin centers was observed. Thermolysis of 46 resulted in the generation of the cubane 4. The complexes 47 and 48 were prepared in THF by the reaction of 30a with LiCl and FeCh, respectively, in a 3 1 molar ratio. " Both complexes exhibit the coordination of three oxo cubanes to the metal center strong metal-oxygen bonding is indicated by the short metal-oxygen bond distances [47,... 

Of the first three, which ion has the shortest metal-oxygen bond distance Explain briefly. 

Figure 1-12 Stmctural rationalization of the thermal expansion behavior for -eucryptite. The Li and AI,Si atoms are coplanar normal in the (001) plane, and the UO4 and (AI,Si)04 tetrahedra share edges. Thermal expansion in the (001) plane reduces the repulsive force between Li and AI,Si. However, maintaining the metal-oxygen bond distances requires a contraction along [001]. Thus, a and b increase with increasing temperature, while c decreases (after Palmer 1994).

Strength Dq of the sixfold coordinated Cr " ion (i.e., the energy of its band) corresponds to the inverse fifth power of the mean metal-oxygen bond distances ... 

Quantitative phase analysis, agreement factors and refinement details, unit cell parameters, mean metal-oxygen bond distances and interatomic angles, and the effective coordination number (ECoN) at cubic site of orthogallate perovskites are listed in Tables 12.2 and 12.3. 

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