Jean-Claude Bunzli - Trivalent lanthanide ions: versatile coordination centers with unique spectroscopic and magnetic properties

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  Bunzli,J.C.G., Andre,N., Elhabiri,M., Muller,G., Piguet,C.   Journal of Alloys and Compounds 2000  303 66-74

  Abstract: At first sight, trivalent lanthanide   ions Ln(III) are not very attractive to the chemist: the   spherical entities with "inner" 4f valence electrons interact   electrostatically with their surroundings, display little   stereochemical preferences, and have very similar chemical   behavior. On the other hand, these ions exhibit rich and unique   spectroscopic and magnetic properties that can be taken advantage   of either for spectroscopic and magnetic probes, or to construct   materials with specific physico-chemical properties. Moreover,   the intrinsic chemical drawbacks of the Ln(III) ions can be   turned into a benefit since the ions adapt easily to almost any   chemical environment and can therefore be readily introduced into   a variety of ionic, molecular, and supramolecular edifices where   they act as functional centers. We will first outline the   historical aspects of Ln(III) coordination chemistry. Fundamental   properties of the Ln(III) ions, including coordination numbers   and geometries, solvation, hydrolysis and thermodynamic aspects   of complexation, are then briefly reviewed. We finally focus on   the several methods developed by inorganic chemists to trap the   elusive lanthanide ions into environments preserving or even   enhancing their physical properties, or increasing the   differences in their chemical characteristics. (C) 2000 Elsevier   Science S.A. All rights reserved

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