Symmetry and coordination

True metals alkali, alkaline earth metals, Al, Cu, Ag, Au, etc., having a high specific electrical conductivity (OhnG cm l) k = 105—106 and crystal structures of high symmetry and coordination numbers (CN = 8-12). 

Multiplicity, Wyckoff letter, site symmetry, and coordinates given for each set of equivalent positions. 

The most reasonable qualitative explanation of the change in the emission spectra is the above-mentioned resemblance to solution or solid state behavior which correlates well with the crystallinity of the uranyl-exchanged zeolites as determined by X-ray powder diffraction. However, there are differences between all of the zeolites which could be an indication of site symmetry and coordination in the lattice. The aluminosilicate lattice is preserved after ion-exhange except for zeolites A and ZSM-5. 

Default structures high-symmetry structures that are ubiquitous for all building blocks with a particular symmetry and coordination number... 

Copper proteins. EPR spectroscopy has played an important role in determining structural and redox properties in Cu-containing enzymes. Based on the spectra of bioinorganic model compounds, it became possible to determine the symmetry and coordination environment of many Cu-containing proteins from the EPR spectra. Correlations between EPR and optical spectra also provided important guides to determining the structures and ligands and led to the discovery of two distinct types of... 

Analysis of d-d spectra of transition-metal complexes can give information about three parameters of structural importance the symmetry of the species, the magnitude of A, and the magnitude of the Racah parameter B. Identifying the symmetry and coordination number of a complex is obviously important in determining its stmcture. Xhe number of methods available for studying complicated species in solution is limited, and electronic spectroscopy is useful in this context. Xhe electronic spectmm of nickel cytochrome c, for example, is interpreted as showing that the nickel atom is six-coordinated, rather than four-coordinated. A... 

King RB (2000) Atomic orbitals, symmetry, and coordination polyhedra. Coord Chem Rev 197 141... 

The surface of many metal oxides is altered when exposed to the external environment. Since the symmetry and coordination of the metal ions is lost at the surface, they show a strong tendency to become saturated by reacting with gas molecules. One major process that takes place is hydroxylation, which is the result of a true chemical reaction between surface M-O bonds and water molecules. The kinetics of this process depends on many variables, among which temperature plays an important role, and the resulting hydroxyl group densities are basically dictated by the nature of the metal oxide. Another process that occurs simultaneously with hydroxylation — specifically on metal oxides of basic character — is carbonation. 

By considering the symmetry and coordinate transformation properties of a nematic liquid crystal under the action of an applied electric field, these authors were able to obtain explicit expressions for the susceptibility tensors Xyj. and and explain the experimental observations of second-harmonic generations by several groups. ... 

---