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The title compound is tetragonal with a = 10.430 (5), c = 23.82 (1) A, Z = 4, space group P4~2~2. The structure was determined by Patterson and Fourier methods and refined by full-matrix least squares to a final R of 0.037 for 924 observed reflexions. The U atom is octahedraily coordinated with the HMPA iigands in the trans position.

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The crystal structures of the bis(triphenylethylphosphonium) hexahalouranates(IV), [P(C 6H5)3 C 2H5 ] 2[U X 6] IX = (I) chlorine, (II) bromine], have been determined from three-dimensional X-ray diffraction data collected on an automatic Philips PW 1100 four-circle diffractometer using 2894 (I) and 1448 (II) structure amplitudes from independent reflexions. The compounds crystallize in the (I) triclinic P i, and (II) mono-