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By David Michael P. Mingos

1. D.M.P. Mingos, J.E. McGrady, A. L. Rohl Moments of Inertia in Cluster and Coordination Compounds 2. M. Drillon, J. Darriet growth in Polymetallic Exchange-Coupled structures, a few Examples in Inorganic Chemistry three. P. Zanello Stereochemical elements linked to the Redox Behaviour of Heterometal Carbonyl Clusters four. R. G. Denning digital constitution and Bonding in Actinyl Ions five. M. Evain, R. Brec a brand new method of Structural Description of advanced Polyhedra Containing Polychalcogenide Anions 6. E. Brese, M. O'Keeffe Crystal Chemistry of Inorganic Nitrides

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Extra resources for Complexes, Clusters and Crystal Chemistry (Structure and Bonding, Volume 79)

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6 References . . . . . . . . . . . . . . . . . . . . . . 76 81 81 84 86 86 87 91 93 97 . . . . . . . . . 99 Structure and Bonding 79 9 Springer-Verlag Berlin Heidelberg 1992 56 Marc Drillon and Jacques Darriet 1 Introduction The chemical and physical properties of polynuclear systems always attract the attention of researchers concerned in inorganic and molecular chemistry, bioinorganics and solid state physics.

Bdt = benzene dithiolate Moments of Inertia in Cluster and Coordination Compounds 37 taken as the torsion angle defined by the two chelating S atoms and the centroids of the two parallel triangular faces. Figure 23 illustrates the projection of the moments of inertia of the dithiolate ligands onto the Ix + Iy + Iz = 6 plane plotted on the rearrangement coordinate for the trigonal twist with g = 82 ~ The twist angle for each structure is also included. Figure 23 shows that although most of the dithiolato complexes lie close to the idealised trigonal twist rearrangement pathway, they lie systematically within the 'V' defined by the idealised structures.

61 ~ ('octahedron') and 49 ~ (trigonal prism). 28 ~ ('octahedron') and 40 ~ (trigonal prism). The calculated moments of inertia of intermediate structures as the rearrangement coordinate is traversed are summarised in Tables 15 and 16. Table 14. 000 15. 001 Moments of Inertia in Cluster and Coordination Compounds 35 Table 16. 000 Table 17. 000. 3 ~. Elongation caused by increasing the bite angle to 100 ~ makes the limiting 'octahedral' geometry prolate. Table 17 summarises the values of 0 and the compression ratios for limiting polyhedral forms for ligand bite angles of 82 ~ 90 ~ and 100~ It is noteworthy that the ranges of 0 associated with the individual bite angles overlap.

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