Advances in Inorganic Chemistry and Radiochemistry, Vol. 12 by H.J. Emeléus (ed.), A.G. Sharpe (ed.)

By H.J. Emeléus (ed.), A.G. Sharpe (ed.)

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PROTACTINIUM PENTOXIDE The pentavalent oxide, Pa,O,, is obtained when the hydroxide is heated in air or oxygen above 650°C. It is a stoichiometric phase and is useful in analytical procedures. Recent investigations ( 128, 128, 129) have shown that several crystal modifications can be prepared, depending on the temperature to which the pentoxide is heated, but the existence of the orthorhombic phase reported by Sellers et al. (125) and also by Kirby (99)has not been confirmed. The properties of the various crystal modifications are listed in Table XII.

The product from dilute sulfuric acid has been assigned the formula Pa,09*3Hz0 (129);a t 20OOC in air this decomposes to yield the pentioxide hydrate Pa,O,. H,O. nH,O, has also been isolated from aqueous solution. It is a white solid which is insoluble in both 2 M NaOH and 1 M HzOz,but which dissolves in a mixture of these solutions. It is well known that protactinium(V) can be precipitated from oxalic acid solution by the addition of hydrochloric acid. 0). Protactinium oxygen stretching vibrations observed a t 778 cm-l indicate the presence of Pa-O-Pa groups (112),but there is no evidence for the presence of discrete Pa=O groups.

It is well known that protactinium(V) can be precipitated from oxalic acid solution by the addition of hydrochloric acid. 0). Protactinium oxygen stretching vibrations observed a t 778 cm-l indicate the presence of Pa-O-Pa groups (112),but there is no evidence for the presence of discrete Pa=O groups. It is insoluble in dilute hydrochloric and oxalic acid solutions; it dissolves in 8 M HCl and is unstable in air, decomposing t o the pentoxide at 3 4 O O C . - X. Appendix THE THIRD INTERNATIONAL PROTACTINIUM CONFERENCE, SCHLOSS ELMAU, 1969 While this article was in press the Third International Conference on Protactinium Chemistry was held a t Schloss Elmau, Mittenwald, West Germany in April, 1969.

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Advances in Inorganic Chemistry and Radiochemistry, Vol. 12 by H.J. Emeléus (ed.), A.G. Sharpe (ed.)
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