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2004
Gold
I 7600
48- 023
Au2(SeO3)2(SeO4): Synthesis and Characterization of a New Noncentrosymmetric
Selenite—Selenate. — The title compound is prepared by hydrothermal reaction of
elemental gold in conc. aq. selenic acid (250 °C, autoclave; 80% yield) and its structure
is determined by single crystal XRD. Au2(SeO3)2(SeO4) crystallizes in the orthorhombic space group Cmc21 with Z = 4. Au3+ is surrounded by four oxygen atoms of four
monodentate SeO23 - ions in a square-planar manner. The linkage of the polyhedra leads
to double chains in the [001] direction which are connected to puckered layers by
SeO24 - groups. The noncentrosymmetric space group is proved by the observation of
an SHG effect upon irritation at 1064 nm that shows an efficiency of about 43% compared to a KDP reference. Au2(SeO3)2(SeO4) decomposes at about 370 °C in one step
yielding elemental gold. — (WICKLEDER*, M. S.; BUECHNER, O.; WICKLEDER,
C.; EL SHEIK, S.; BRUNKLAUS, G.; ECKERT, H.; Inorg. Chem. 43 (2004) 19,
5860-5864; Inst. Anorg. Chem., Univ. Koeln, D-50939 Koeln, Germany; Eng.) —
Schramke
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