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2005
Zinc
I 1700
32- 021
The Reaction Between ZnO and Molten Na2S2O7 or K2S2O7 Forming Na2Zn(SO4)2
or K2Zn(SO4)2, Studied by Raman Spectroscopy and X-Ray Diffraction. — Slow
cooling of 1:1 solutions of ZnO in molten Na2S2O7 or K2S2O7 from 500 °C results in
the formation of crystals of Na2Zn(SO4)2 (I) and K2S2O7 (II), respectively. These sulfates crystallize in the monoclinic space group P21/n with Z = 8 (I) resp. Z = 4 (II). In
both compounds, Zn is in nearly perfectly trigonal-bipyramidal coordination to five
oxygen atoms, with Zn—O bond lengths ranging from 1.99 to 2.15 Å. The sulfate
groups connect adjacent Zn2+ ions, forming complicated three-dimensional networks.
The Na+ or K+ ions adopt positions between the ZnO5 polyhedra and the SO4 tetrahedra.
— (BERG*, R. W.; THORUP, N.; Inorg. Chem. 44 (2005) 10, 3485-3493; Dep.
Chem., Tech. Univ. Den., DK-2800 Lyngby, Den.; Eng.) — Schramke
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