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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

Synthese, Eigenschaften und Kristallstruktur von (NH4)NbOBr4/ Synthesis, Properties and Crystal Structure of (NH4)NbOBr4

  • Manfredo Hörner , Wolfgang Hiller , Joachim Strähle and George M. Sheldrick
From the journal Zeitschrift für Naturforschung B
https://doi.org/10.1515/znb-1988-0811
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Abstract

(NH4)NbOBr4 is obtained as air sensitive, light red crystals from NH4Br and NbBr 5 in a sealed glass ampoule at 420 °C, whereby the oxygen presumably originates from the glass surface. The compound crystallizes in the monoclinic space group C2/m with a = 1269.9(1), b = 1384.7(2). c = 773.0(2) pm, β = 114.44(2)° and Z = 6.

The structure is built up by NH4+ cations and polymeric NbOBr4 anions. Symmetrical linear oxo bridges with Nb-O = 199 pm connect square planar NbBr4 units to form endless chains arranged in planes parallel (010). Neighbouring NbBr4 units are in eclipsed as well as staggered orientations. The NH4+ cations are located between the planes of parallel NbOBr4 - chains. The vibrational frequencies of the IR and Raman spectrum are assigned.

Keywords: Ammonium Tetrabromooxoniobate(V); Synthesis; Crystal Structure; Raman Spectra; IR Spectra
Received: 1988-3-25
Published Online: 2014-6-2
Published in Print: 1988-8-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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From the journal
Zeitschrift für Naturforschung B
Zeitschrift für Naturforschung B
Volume 43 Issue 8

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