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The crystal structure of Thorium(IV)tetrakis(trifluoroacetylacetonate)
Author(s) -
F. S. Wessels G.,
G. Leipoldt J.,
D. C. Bok L.
Publication year - 1972
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19723930312
Subject(s) - square antiprism , thorium , crystallography , van der waals force , crystal structure , molecule , atom (system on chip) , van der waals radius , chemistry , isotropy , crystal (programming language) , anisotropy , materials science , oxygen atom , physics , optics , organic chemistry , metallurgy , programming language , computer science , embedded system , uranium
Abstract The crystal structure of the compound thorium(IV)tetrakis(trifluoro‐acetylacetonate) was determined by means of a threedimensional X‐ray analysis. The space group is C2/c and the cell dimensions are a = 25,05 Å, b = 6.43 Å, c = 21.3 Å, β = 125.4°, with Z = 4. The thorium atom is coordinated by 8 oxygen atoms in the form of an 1111 (D 4 –422) antiprism. The mean of the Th–O distances is 2.39 Å with a standard deviation ± 0.04 Å. The trifluoroacetylacetonate rings are approximately planar, except for the CH 3 and CF 3 groups which show significant deviations. The Th–O bonds form angles of approximately 72° and 50° with the theoretical 8 ‐axis of the antiprism. The structure is stabilized by VAN DER WAALS contacts between neighbouring molecules. The refinement of the atomic positions, the anisotropic temperature parameter of thorium and isotropic temperature parameters of all the other atoms by the least squares method, has given a reliability index of 0.148.