Abstract
The structures of UCl 4·2hmpa and UBr 4·2hmpa have been determined by Fourier methods from single-crystal X-ray diffraction data Full-matrix least-squares refinement yielded final conventional R factors of 0.062 and 0.059 respectively. The complexes are isomorphout and crystallise in the space group P2 1/n with a = 14.141(5), b = 10.530(5), c = 9.076(5) Å, β = 93.33° and a = 14.348(5), b = 10.698 (5), c = 9.304(5), β = 91.95 respectively. The hmpa moieties are in trans-octahedral arrangement about the uranium atom. The principal bond lengths are U—X (X = Cl, Br) = 2.615, 2.78; U—O = 2.23, 2.18; O—P = 1.50, 1.53 Å respectively.
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