Protactinium Fluorides, the New Class, MPaF6

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Science  28 Aug 1964:
Vol. 145, Issue 3635, pp. 924
DOI: 10.1126/science.145.3635.924


Complex fluorides of protactinium having a Pa/M ratio of one (where M = K, Rb, or NH4) have been prepared from concentrated solutions of HF. These MPaF6 compounds are isostructural with the corresponding compounds of pentavalent uranium but not with the tantalum analogs. The size of protactinium (V) is but slightly larger than that of uranium (V)