Dipotassium Tartrate Hemihydrate Single Crystals: XRD, Optical, Electrical Transport and SHG Investigations

Single crystals of Dipotassium tartrate hemihydrate [K2C4H4O6‧½H2O] were grown by
slow evaporation solution technique at room temperature. According to previously
reported single crystal X-ray diffraction (SC-XRD) data, DPTH crystallizes in the
monoclinic system with a non-centrosymmetric space group I2. The obtained
crystalline material Dipotassium tartrate hemihydrate was subjected to vibrational,
nuclear magnetic resonance (NMR), UV-visible (UV-Vis), photoluminescence (PL) and
dielectric analysis. Fourier Transform Infrared (FT-IR) and Fourier Transform Raman
(FT-Raman) spectrum analysis revealed that the molecular structure contains the
dipotassium cation along with L-tartrate anions. The presence of a molecular
environment with hydrogen and carbon in the molecule was represented by the proton
and carbon NMR spectrum. The transparency of the entire visible region was shown by
the UV-Vis spectra, and 327.94 nm was determined to be the lowest cut-off
wavelength. The electrical transport behavior of Dipotassium tartrate hemihydrate was
investigated through frequency-dependent dielectric constant and dielectric loss
studies, providing detailed into polarization mechanisms, charge displacement, and AC
conduction behavior within the crystal lattice. The observed low dielectric loss at higher
frequencies suggests minimal energy dissipation, which is favorable for optoelectronic
and nonlinear optical (NLO) device applications. Second harmonic generation (SHG)
efficiency of the Dipotassium tartrate hemihydrate crystal was about 0.66 of the
standard potassium dihydrogen phosphite (KDP), indicating its potential for nonlinear
optics applications. The Crystal Explorer software was utilized to compute both the 2D
fingerprint plot and the Hirshfeld surface, offering valuable insights into the overall
packing features of the produced Dipotassium tartrate hemihydrate crystal.
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