Raman study of halogen exchange equilibria in low melting mixtures consisting of sodium tetrachloroaluminate and tetrabromoaluminate |
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| Authors: | RW Berg E Kemnitz HA Hjuler R Fehrmann NJ Bjerrum |
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| Institution: | Chemistry Department A, The Technical University of Denmark, Building 207, DK-2800 Lyngby, Denmark |
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| Abstract: | The halogen-redistribution reactions between AlCl4]? and AlBr4]? in molten mixtures of NaAlCl4 and NaAlBr4 with widely varying mole ratios have been studied by Raman spectroscopy at 160–300°C and the melting points have been measured. By monitoring the intensities of the totally symmetric stretching a1-modes of both the parent tetrahalides as well as those of the mixed halides AlCl3Br]?, AlCl2Br]? and AlClBr3]? it is concluded that the mixtures equilibrate very fast and consist of an almost random distribution of the five species. NaAlCl4 and NaAlBr4 form an eutectic mixture with a molar ratio near to 4:1, with a melting point of ca 142°C. |
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| Keywords: | Author to whom correspondence should be addressed |
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