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The calculated moments of inertia of molecules may be used to define the shapes of coordination compounds and cluster molecules. This shape analysis may be related either to electronic factors responsible for distorting the geometry of the molecule or used to define the location of the molecule on the rearrangement coordinate linking alternative polytopal forms.
The aim of this paper is to review some basic concepts needed for describing polymetallic exchange-coupled systems and to treat problems of current interest in inorganic chemistry. First, a brief survey of a priori conflicting descriptions of the exchange mechanisms is proposed. The overlap between the Heisenberg and Anderson models is demonstrated in the limiting case of highly distorted systems,...
Electrochemical techniques provide a clear picture of the ability of metal cluster compounds to undergo electron transfer processes, not only because they quantify the relative ease of such redox changes through the relevant standard electrode potential values, but also allow one to perceive the occurrence of chemical and/or stereochemical rearrangements within the starting molecular framework following...
The actinyl ions exhibit an unusually robust covalent bond which has a profound influence on their chemistry. Their electronic structure has been unravelled by the use of a variety of optical measurements and by photoelectron spectroscopy, which together establish the composition and role of the valence orbitals. The experimental energy level scheme can be compared with the results of molecular orbital...
Because of the occurrence of polyanionic groups, in particular of (X2)2− pairs, that are found along with the monoatomic ligands, rather complex coordination groups (M(Xi)mXn) (with i=2 in most cases) are encountered in transition metal chalcogenide families. In order to facilitate the classification and the description of most phases of those families, a general method to generate and to classify...
The crystal chemistry of solid inorganic nitrides, azides, amides and imides is reviewed systematically. Many of the structures unique to nitrides are illustrated and analyzed. We give full crystallographic data for all compounds with well determined structures and list derived bond valences and Madelung potentials. Similarities to and differences from oxide chemistry are pointed out and general principles...
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