Cages geometry

Exposure water or air flow rate exposure cage geometry air samplers wind direction location (coordinates, and preferably a digital picture) start and end date and time physical appearance after exposure (description, and preferably a digital picture) temperature pH (when organic acids or bases are flie target analytes) suspended matter, and POC and DOC levels (water) or particle (air) levels other observations relevant to QC... 

Figure 14.3 Schematic representation of an exohedral and an endohedral attack of an addend, represented by a p orbital, to the fullerene with fixed cage geometry.

Hardy, A. D. U., McKendrick, J. J., Macnicol, D. D., Alteration of cage geometry by systematic structural modification of a clathrate host molecule. J. Chem. Soc., Perkin Trans. 21979, 1072-1077. 

Electrochemical interconversion of homo- and heteronuclear gold cluster compounds remains an area that has received scant attention, despite the potential for changing the electron count and hence the metal cage geometries of these clusters by electrochemical methods. The electrochemical redox reactions of [Pt(AuPPh3)8]2+ have been studied, using pulse, differential pulse, and cyclic voltammetric techniques (124, 242) and two reversible, one-electron reduction steps have been... 

Summary of Bond Lengths and Metal Cage Geometries for Au, Heteronuclear Cluster Compounds Containing p.2-AuPR3 Fragments... 

Fig. 19. The metal cage geometries of (a) [(PhMe2P)3ReH2(AuPPh3)3] and (b) (PhMe2P) iReH3( AuPPh3 ) 1 ]".

The adoption of two different geometries for these isoelectronic Au6Pt clusters is probably due to electronic differences between the carbon monoxide and acetylide ligands, as neither ligand is sterically demanding in these compounds. However, both cluster compounds adopt metal cage geometries that are best described as hemispherical, as expected from their valence electron counts. 

The heteronuclear clusters described previously also conform to this generalization, as Tables XVI and XVII demonstrate. All of the clusters characterized by 12ns + 16 valence electrons adopt toroidal geometries and will readily add one molecule of carbon monoxide to give clusters with a valence electron count of 12ns + 18. The resultant metal cage geometries have been described as either spherical or hemispherical. 

Each of these n-vertex carboranes has the same cage geometry as its B H counterpart, except that C2B3H5 has no known B5H " analogue. Application of the PSEPT rules (see p 145) is straightforward, with contributions of 3 electrons from... 

Vertices Dicarbon series Monocarbon series Cage geometry... 

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