Ammonium beryllium selenate dihydrate, (NH4)2Be(SeO4)2•2H2O: Preparation, X-ray powder diffraction, and vibrational spectra

被引：1
作者：
Karadjova, V. [1 ]
Georgiev, M. [1 ]
Marinova, D. [2 ]
Stoilova, D. [2 ]
机构：
[1] Univ Chem Technol & Met, Dept Inorgan Chem, BU-1756 Sofia, Bulgaria
[2] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria
来源：
VIBRATIONAL SPECTROSCOPY | 2013年 / 64卷
关键词：
Ammonium beryllium selenate dihydrate; Thermal dehydration; X-ray powder diffraction; Vibrational spectra; WATER-MOLECULES; HYDROGEN-BONDS; CRYSTALS; RAMAN;
D O I：
10.1016/j.vibspec.2012.10.007
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The solubility in the three-component (NH4)(2)SeO4-BeSeO4-H2O system is studied at 25 degrees C by the method of isothermal decrease of supersaturation. (NH4)(2)Be(SeO4)(2)center dot 2H(2)O crystallizes from solutions containing 31.35 mass% beryllium selenate and 30.66 mass% ammonium selenate up to solutions containing 26.84 mass% beryllium selenate and 46.84 mass% ammonium selenate. The X-ray powder diffraction data show that (NH4)(2)Be(SeO4)(2) center dot 2H(2)O is isostructural with the respective K2Be(SeO4)(2)center dot 2H(2)O, K2Be(SO4)(2) center dot 2H(2)O and Rb2Be(SO4)(2)center dot 2H(2)O. (NH4)(2)Be(SeO4)(2)center dot 2H(2)O crystallizes in the monoclinic space group P2(1)/c: a = 11.747(3)angstrom, b = 12.212(4)angstrom, c=7.649(2)angstrom, beta=96.94(3)degrees, V= 1089.3(3)angstrom(3), Z=4. Vibrational spectra (infrared and Raman) of the title compound are presented and discussed with respect to the internal modes of both the ammonium and the selenate tetrahedra, hydrogen bond strengths and the lattice vibrations of the BeO4 tetrahedra (skeleton vibrations). (C) 2012 Elsevier B.V. All rights reserved.
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页码：39 / 43
页数：5
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