6. Summary
The Raman spectrum of guanidinium aluminium sulphate hexahydrate also known as ‘GASH’ which is a ferro-electric crystal and has strong hydrogen bonds has been recorded. 38 Raman lines have been identified in the spectra of GASH. The O-H stretching mode is found to be very much influenced by the hydrogen bond and they appear over a widely extended region from 2240–3600 cm.−1 It can therefore be concluded that all the O-H bonds are hydrogen bonded and some of them are quite strong. The Raman lines due to the N-H vibrations appear with the normal frequency shifts indicating thereby that N-H bonds are not hydrogen bonded. These conclusions are fully supported by the results obtained from the X-ray crystal structure analysis of GASH. The principal vibrations of the Al-(OH2)6 groups have also been identified.
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Krishnan, R.S., Neelakantan, P. Raman spectrum of guanidinium aluminium sulphate hexahydrate. Proc. Indian Acad. Sci. 61, 24–33 (1965). https://doi.org/10.1007/BF03049234
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DOI: https://doi.org/10.1007/BF03049234