Ternary and Quaternary Uranium and Thorium Chalcogenides

A survey of the structural chemistry of ternary and quaternary uranium (U) and thorium (Th) chalcogenides is presented. Specific attention is paid to the coordination environments of U and Th in a variety of classical and nonclassical structure types. The problems of defining the oxidation state of U from U-Q (Q = S, Se, Te) bond lengths and magnetic susceptibility data are also discussed.