A systematic analysis of the IR and Raman spectra of Rochelle salt (NaKC4H4O6 · 4H2O) in terms of the standard frequency correlations, deuteration shift and typical nature (with respect to intensity and width) of bands due to different modes is reported. The bands due to the internal modes (excluding some skeletal modes) of the C4H4O ion appear as doublets. For certain modes [e.g. βCH, νC(OH) and δCOO] doublets arise owing to interactions between two identical oscillations of two identical groups in COO(HO)HCCH(OH)COO2−, while for other modes (e.g. νCH, ν , ν , δCOH and τCOO) they arise owing to crystallographically distinguishable sites for two identical oscillators.
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Bhattacharjee et al. (1988) studied this question.
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