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Halide derivatives of rare-earth metal(III) oxidomolybdates(VI) have been investigated comprehensively over the last decade comprising the halogens fluorine, chlorine, and bromine. Iodide-containing compounds are so far unknown. The simple composition  REX MoO 4  ( RE =rare-earth element,  X =halogen) is realized for  X =F almost throughout the complete lanthanide series as well as for yttrium. While ytterbium and lutetium do not form any fluoride derivative, for lanthanum, only a fluoride-deprived compound with the formula La 3 FMo 4 O 16  is realized. Moreover, molybdenum-rich compounds with the formula  REX Mo 2 O 7  are also known for yttrium and the smaller lanthanoids. For  X =Cl the composition  RE ClMoO 4  is known for yttrium and the whole lanthanide series, although, four different structure types were identified. Almost the same holds for  X =Br, however, only two different structure types are realized in this class of compounds. In the case of halide derivatives of rare-earth metal(III) oxidotungstates(VI) the composition  REX WO 4  is found for chlorides and bromides only, so far. Due to the similar size of Mo 6+  and W 6+  cations, the structures found for the tungstates are basically the same as for the molybdates. With the larger lanthanides, the representatives for both chloride and bromide derivates exhibit similar structural motifs as seen in the molybdates, however, the crystal structure cannot be determined reliably. In case of the smaller lanthanoids, the chloride derivatives are isostructural with the respective molybdates, although the existence ranges differ slightly. The same is true for rare-earth metal(III) bromide oxidotungstates(VI).

On halide derivatives of rare-earth metal(III) oxidomolybdates(VI) and -tungstates(VI)