Clusters planar

DF calculations were carried out on CO complexes of small neutral, cationic, and anionic gold clusters Au with n= 1-6. The -coordination mode (terminal C-coordination) was found to be the most favorable one irrespective of the charge of the cluster, and cluster planarity is more stable for the bare clusters and their carbonyls. As expected, adsorption energies are greatest for the cationic clusters, and decrease with size. Instead, the adsorption energies of... 

Figure 3.11 Al clusters planar and 3D isomers from LDA calculations. The number next to each structure corresponds to the spin multiplicity. The 2D structure of Alg is buckled. Reprinted with permission from [172]. Copyright 1993 American Institute of Physics...

Xiao L, Wang L. Structures of platinum clusters planar or spherical J Phys Chem A 2004 108.41 8605-14. 

Kumar, V., and Kawazoe, Y. 2008. Evolution of atomic and electronic structure of Pt clusters Planar, layered, pyramidal, cage, cubic, and octahedral growth. Phys. Rev. B 11 205418. 

Xiao, L., and Wang, L. C. 2004. Structures of platinum clusters Planar or spherical J. Phvs. 

THz spectrum of such clusters fomred in a pulsed planar supersonic expansion [65],... 

For tetranuclear cluster complexes, three stmcture types are observed tetrahedral open tetrahedral (butterfly) or square planar, for typical total valence electron counts of 60, 62, and 64, respectively. The earliest tetracarbonyl cluster complexes known were Co4(CO)22, and the rhodium and iridium analogues. The... 

Fig. 1. Typical ED pattern of polychiral MWCNT. The pattern is the superposition of the diffraction patterns produced by several isochiral clusters of tubes with different chiral angles. Note the row of sharp oo.l reflexions and the streaked appearance of 10.0 and 11.0 type reflexions. The direction of beam incidence is approximately normal to the tube axis. The pattern exhibits 2mm planar symmetry [9].

At normal temperatures, sulfur trioxide is a volatile liquid (its boiling point is 45°C), composed of trigonal planar S03 molecules. In the solid and to some extent in the liquid, these molecules form trimers (unions of three molecules) of composition S309 (14) as well as larger clusters. 

The initial results on the [NaA ] clusters have been extended to the heterocyclic ring species [XAls] (X = Si, Ge, Sn, Pb) bearing a single charge and as a result are not prone to dissociation of an electron like the [Al4] or [Ga4H2] anions [69]. A planar four-membered ring structure is in all cases the most stable structural isomer with Al—Al distances in the range 2.57-2.61 A. 

Large clusters of carbon atoms have been studied with ab initio calculations using basis sets of double-C quality. Planar, single-sheet graphite fragments with 6 - 54 atoms were investigated, as well as the spherical "Buckminsterfullerene ... 

From the two-dimensional, graphite-like clusters, the extension to three-dimensional structures is obvious. Symmetric structures developed in a similar fashion to the planar systems would grow in three dimensions with increasing N, and the number of atoms would increase faster. In this work clusters of T symmetry were studied, resembling a small fragment of a diamond structure. Only systems with saturated external bonds were considered. The number of carbon and hydrogen atoms in such a structure is given by... 

Non-planar Clusters Containing Five-membered Rinas... 

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