Studies on solution-grown pure and doped Sodium Potassium tartrate crystals

A systematic analysis of the Fourier transform infrared spectroscopy and Raman spectra of pure and Cu(NO3)23H2O doped Rochelle salt (NaKC4H4O64H2O) 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 C4H4O62- ion appear as doublets. For certain modes (e.g. βCH, γC(OH) and δCOO) doublets arise owing to interaction between two identical oscillations of two identical groups in COO(HO)HCCH(OH)COO2−, while for other modes (e.g. γCH, γCOa, γCOs, δCOH and τCOO) they arise owing to crystallographically distinguishable sites for two identical oscillators. The effect of dopant in the pure Rochelle salt crystals is found out by using Elemental analysis. The unit cell volume of pure and Cu(NO3)23H2O doped Rochelle salt crystals is found out from powder X-ray diffraction studies.

Crystals grown by solution growth at room temperature (a) pure and (b) Cu(NO3)23H2O doped Rochelle salt crystals.Figure optionsDownload as PowerPoint slideHighlights
► Color of Cu(NO3)23H2O doped NaKC4H4O64H2O changed into light blue color.
► EDAX study confirms the dopant enter into the lattice of pure crystal.
► Transmittance % of doped crystals are less when compared to pure crystals.
► The grown crystals are orthorhombic in structure.
► Unit cell dimensions of pure and doped crystals are different from each other.