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A three-dimensional structure analysis of the title compound has shown it to be the first example of a protactinium (V) compound to contain a protactinium–oxygen double bond (PaO 1·74 Å). Crystals are monoclinic, space-group Cc, with Z= 4 in a unit cell of dimensions : a0= 14·131 ± 0·008, b0= 14·218 ± 0·008, c0= 13·235 ± 0·009 Å, and β= 91·04°± 0·03°. The structure was solved by conventional Patterson and Fourier methods and refined by least-squares techniques to R 6·7% for 558 independent reflections. The oxygen and five chlorine atoms form a distorted octahedron around the protactinium atom; Pa–Cl distances range from 2·42 to 2·72 Å.
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Brown et al. (1972) studied this question.
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