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Identification of mixed bromidochloridotellurate anions in disordered crystal structures of (bdmim)2[TeX2Y4] (X, Y = Br, Cl; bdmim = 1-butyl-2,3-dimethylimidazolium) by combined application of Raman spectroscopy and solid-state DFT calculations

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Närhi, S., Kutuniva, J., Lajunen, M., Lahtinen, M., Tuononen, H., Karttunen, A., Oilunkaniemi, R., & Laitinen, R. (2014). Identification of mixed bromidochloridotellurate anions in disordered crystal structures of (bdmim)2[TeX2Y4] (X, Y = Br, Cl; bdmim = 1-butyl-2,3-dimethylimidazolium) by combined application of Raman spectroscopy and solid-state DFT calculations. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 117, 728-738. https://doi.org/10.1016/j.saa.2013.09.063
Published in
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Authors
Närhi, Sari |
Kutuniva, Johanna |
Lajunen, Marja |
Lahtinen, Manu |
Tuononen, Heikki |
Karttunen, Antti |
Oilunkaniemi, Raija |
Laitinen, Risto
Date
2014
Discipline
Epäorgaaninen ja analyyttinen kemiaInorganic and Analytical Chemistry
Copyright
© 2013 Elsevier B.V. This is a final draft version of an article whose final and definitive form has been published by Elsevier. Published in this repository with the kind permission of the publisher.

 
The discrete mixed [TeBrxCl6−x]2− anions in their disordered crystal structures have been identified by using the phases prepared by the reaction of 1-butyl-2,3-dimethylimidazolium halogenides (bdmim)X with tellurium tetrahalogenides TeX4 (X = Cl, Br) as examples. Homoleptic (bdmim)2[TeX6] [X = Cl (1), Br (2)] and mixed (bdmim)2[TeBr2Cl4] (3), and (bdmim)2[TeBr4Cl2] (4) are formed depending on the choice of the reagents, and their crystal structures have been determined by single-crystal X-ray diffraction. The coordination environments of tellurium in all hexahalogenidotellurates are almost octahedral. Because of the crystallographic disorder, the mixed [TeBr2Cl4]2− and [TeBr4Cl2]2− anions in 3 and 4 cannot be identified in their crystal structures. Pawley refinement of the X-ray powder diffraction patterns of 1–4 indicates the presence of single phases in all four products. The solid state Raman spectra of 1–4 were assigned with help of DFT calculations that were performed both for the discrete anions in vacuum and for the complete crystal structures employing periodic boundary conditions. The fundamental vibrations of the homoleptic [TeX6]2− (X = Cl, Br) anions could be well reproduced by the solid-state DFT computations and enabled a complete assignment of the Raman spectra. While the presence of cis-isomers in both [TeBr2Cl4]2− and [TeBr4Cl2]2− could be inferred by the computed fundamental vibrations, that of trans-isomers among the reaction products is, however, also possible. The pathway of the formation of [TeX4Y2]2− isomers from TeX4 and Y− (X, Y = Cl, Br) was also explored by DFT calculations both in vacuum and in solution and indicated that both reactions afforded 80 mol% of cis-isomers and 20 mol% of trans-isomers. ...
Publisher
Elsevier B.V.
ISSN Search the Publication Forum
1386-1425
Keywords
bromidikloriditelluraatit kiinteän tilan DFT laskut Raman-spektroskopia kristallografia bromidochloridotellurates solid-state DFT calculations Raman spectroscopy kidetiede
DOI
https://doi.org/10.1016/j.saa.2013.09.063
URI

http://urn.fi/URN:NBN:fi:jyu-201511253812

Publication in research information system

https://converis.jyu.fi/converis/portal/detail/Publication/22811315

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