Raman spectrum of guanidinium aluminium sulphate hexahydrate

  • R. S. Krishnan
  • P. Neelakantan

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.


Raman Spectrum Frequency Shift Guanidinium Rabie Raman Line 
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Copyright information

© Indian Academy of Sciences 1965

Authors and Affiliations

  • R. S. Krishnan
    • 1
  • P. Neelakantan
    • 1
  1. 1.Department of PhysicsIndian Institute of ScienceBangalore-12

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