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Abstract
[N(CH3)4]2SeO4 and [N(CH3)4]2CrO4 have been investigated by Infrared and Raman spectroscopy, coupled thermogravimetric and differential thermal analysis combined with mass spectroscopy of the evolved gases and temperature dependent X-ray diffraction. The crystal structure of [N(CH3)4]2SeO4 has been determined from single crystal data (cubic, Fm3̄m. a -11.1077(7) Å, Z = 4) and reveals [N(CH3)4]+ cations and SeO42- anions to be arranged in a Li2O -type of structure. While the cation framework of regular tetrahedra is orientationally fixed, the selenate anions are disordered. Powder diffraction data show [N(CH3)4]2CrO4 to be isostructural (cubic, Fm3̄m, a = 11,039(1) Å, Z = 4).
Keywords: Tetramethylammonium Selenate(VI); Tetramethylammonium Chromate(VI); Crystal Structure; Vibrational Spectra; Thermal Analysis
Received: 1998-3-5
Published Online: 2014-6-2
Published in Print: 1998-7-1
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