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The Synthesis and Crystal Structure of U 7 O 2 Se 12
Author(s) -
Ward Matthew D.,
Ibers James A.
Publication year - 2014
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.201400144
Subject(s) - crystallography , crystal structure , unit (ring theory) , uranium , hexagonal crystal system , oxygen atom , bar (unit) , trigonal crystal system , oxygen , planar , space (punctuation) , materials science , group (periodic table) , physics , chemistry , molecule , mathematics , metallurgy , linguistics , mathematics education , meteorology , computer graphics (images) , philosophy , computer science , quantum mechanics
The new compound U 7 O 2 Se 12 was synthesized at 1173 K as a result of both unintentional and intentional oxygen contamination. The composition balances with formal charges of +4, –2, and –2 for U, O, and Se, respectively. U 7 O 2 Se 12 crystallizes with one formula unit in space group C $\rm^{1}_{3h}$ ‐ P $\bar{6}$ of the hexagonal system in a cell of dimensions a = 11.3222(4) Å, c = 4.1362(1) Å. The structure of U 7 O 2 Se 12 closely resembles that of the An 7 Te 12 ( An = Th, U) compounds, but contains cavities, in which oxygen atoms are coordinated to three uranium atoms in a trigonal planar arrangement. It is not known if other members of the An 7 Q 12 family ( An = Th, U; Q = S, Se, Te) are actually An 7 O 2 Q 12 compounds.