mitt describe structural trends observed for Рpounds with heavy oxoanions containing a stereochemically active lone-Рpair of electrons (e.g., those formed by Sb(III), Bi(III), Se(IV), Te(IV), Br(V), and РI(V)). Chapter 6, written by Locock, provides an overview of actinide phosphates and Рarsenates that are of great mineralogical and environmental importance. Chapter 7 by РAbraham and Obbade presents a systematic overview of the structural diversity of Рuranyl vanadates. Chemistry and structural chemistry of anhydrous tri- and tetravalent Рactinide orthophosphates is the topic of Chapter 8 by Orlova. In Chapter 9, Pope Рdescribes plexes of polymolybdates and polytungstates, and also discusses Рsolution studies of equilibria between actinide cations and polyoxometalate anions. Р ixР Preface
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