Vanadium compounds with oxoanions

Within the last few years, the family of uranium compounds with vanadium oxoanions is rapidly expanding. This paper reviews the structural chemistry of natural and synthetic uranium vanadium oxides known to date. For the description of layered structures, the concept of a sheet anion topology initially suggested by Bums et al. for uranyl-based minerals is used [1]. 

E9.14 The atomic number of P is 15. The Z + 8 element has an atomic number of 23 and is V (vanadium). Both form compounds with varying oxidation states up to a maximum value of +5. Both form stable oxides including ones in +5 oxidation state (V2O5 and P1O5). Like phosphorus, vanadium forms oxoanions including ortho-, pyro-, and meta-anions. Consult Section 15.5 for analogous phosphorus oxoanions. 

Vanadium forms at tetravalent state an oxoanion V2O7 which can combine with rare earth, forming the R2V2O7 vanadites (Shin-ike et al., 1977). Trivalent vanadium forms rare earth compounds having the formula RVO3. These compounds, however, cannot be considered as complex compounds but are binary oxides with perovskite structure (Wold and Ward, 1954 Reuter and Wollnik, 1963 Palanisamy et al., 1975). 

Another type of rare earth vanadite is obtained with tetravalent vanadium. The oxoanion V2O7 is formed and the rare earths (Tm Lu, Y) combine with it to form R2V2O7. At high temperatures the compound can be prepared from oxides... 

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