Laser Raman and infrared spectra of Rochelle salt crystals

Abstract

A systematic analysis of the IR and Raman spectra of Rochelle salt (NaKC,H,O, * 4H,O) 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 C,H,O:-ion appear as doublets. For certain modes 1e.g. PCH, vC(OH) and &oo)] doublets arise owing to interactions between two identical oscillations of two identical groups in COO(HO)HCCH(OH)COOz-, while for other modes (e.g.vCH , vso, vso, 6,,, and zcoo) they arise owing to crystallographically distinguishable sites for two identical oscillators.

Vibrational Studies of Gel Grown Ferroelectric RbHC4H4O6 and SrC4H4O6 4H2O Crystals

“…The Raman vibrational bands observed at 1546, 1447, 1396 and 1374 cm -1 in RbHT and 1467, 1444 and 1417 cm -1 in SrTT are assigned to the ν a CO and ν s CO modes. These assignments agree with the assignments for K 2 C 4 H 4 O 6 .1/2H 2 O crystals (BHATTACHARJEE et al,1988). A broad and doublet nature of ν a CO and ν s CO bands have been observed for RbHT crystals.…”

“…In SrTT crystals, βCH vibrational mode are observed as strong at 1296 and 1287 cm -1 (IR) and 1289 cm -1 (Raman). In Raman spectra of K 2 C 4 H 4 O 6 .1/2H 2 O (BHATTACHARJEE et al,1988) and NaKC 4 H 4 O 6 .4H 2 O (BHATTACHARJEE et al, 1989) the band in this region is also reported to be due to the βCH mode of C 4 H 4 O 6 2ion. In secondary alcohol's, the CHOH group and νC(OH) vibrational bands generally appear in the region 1050 -1150cm -1 (COLTHUP et al).…”

“…STUART and SUTHERLAND reported that the alcohol shows very broad and strong absorption IR band around 3300 cm -1 in the liquid or solid state due to the stretching in the O --H .... O bonds, but these bands are very weak in the Raman spectrum (TOBIN). BHATTACHARJEE et al (1988) observed the vibrational bands at 3493, 3434 and 3304, and 3178 cm -1 in K 2 C 4 H 4 0 6 .1/2H 2 O crystals. These vibrational bands are due to ν 3 w, ν 1 w and νOH t modes (w -water, t -tartrate).…”

“…KANEKO et al have observed the C --C stretching modes in the region 880 -1010 cm -1 in metal tartrate crystals. BHATTACHARJEE et al (1988) assigned the bands at 845 and 816 cm -1 to the δCOO mode. In RbHT crystal, the vibrational lines observed around 837 and 789 cm -1 in Raman spectra and 841 and 787 cm -1 in FT-IR spectra are assigned to the δ s COO mode of the HC 4 H 4 O 6 ion.…”

Distortion‐induced intensity of Raman modes of molecular units in different crystal orientations

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] An analysis of Eqns (2j(4) leads to the following inferences :…”