The reaction between ZnO and Molten K2S2O7 forming K2Zn(SO4)2, studied by Raman and IR Spectroscopy and X-ray Diffraction.

Rolf W. Berg, Kurt Nielsen, Soghomon Boghosian

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Abstract

The reaction between zinc oxide and molten potassium pyrosulfate at 500 °C was shown by Raman spectroscopy to be a 1:1 reaction. By lovering the temperature, colorless crystals could be formed. The crystal structure was determined: Space group = P21/c, Z = 4, a = 5.3582(11), b = 8.7653(18), c = 16.153(3) Å, b = 91.78(3)o, wR2 = 0.0758 for all 1930 ? independent reflections. The compound, K2Zn(SO4)2, contained trigonally bipyramidal zinc coordinated to five oxygen atoms, with Zn-O bonds of normal length (~ 2.04 ± 0.05 Å), equitorial bonds being slightly shorter on the average. The O-Zn-O angles were approximately 90o and 120o. The oxygens were all bridging to the two sulfur atoms forming nearly perfect tetrahedral SO42- groups. The K+ ions were placed in between these ZnO5 hexahedra, which formed a three-dimensional network. Bond distances and angles are compared with literature values. Empirical correlations between S-O bond distances and average O-S-O bond angles followed a previously found trend. IR and Raman spectra were obtained and tentatively assigned.
Original languageEnglish
Title of host publicationThe International George Papatheodorou Symposium, Proceedings
Place of PublicationPatras
PublisherS. Boghosian et al., Inst. Chem. Engineering & High Temp. Chem. Processes
Publication date1999
Pages115-119
Publication statusPublished - 1999
EventThe International George Papatheodorou Symposium - Patras, Greece
Duration: 17 Sep 199919 Sep 1999

Conference

ConferenceThe International George Papatheodorou Symposium
CountryGreece
CityPatras
Period17/09/199919/09/1999

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