Crystal growth, spectral, optical, laser damage, photoconductivity and dielectric properties of semiorganic l-cystine hydrochloride single crystal

• l-Cystine hydrochloride single crystal is grown by slow evaporation technique at 40 °C.
• Optical band gap of the crystal is found to be 3.8 eV.
• Thermally it is stable up to 201 °C.
• It exhibits violet fluorescence emission peak at 388 nm.

The semiorganic single crystals of l-cystine hydrochloride have been grown by slow evaporation solution growth technique at 40 °C. The grown crystals were subjected to single crystal XRD, FTIR, optical absorbance, laser damage threshold, photoluminescence, photoconductivity and dielectric studies. Single crystal XRD studies reveal that the crystal belongs to monoclinic system with space group C2 and the lattice parameters are a = 18.63 (Å), b = 5.28 (Å), c = 7.26 (Å), α = 90°, β = 103.70°, γ = 90° and V = 696 (Å3). FTIR spectroscopy confirms that a band at 1731 cm−1 represents characteristic of α-amino acid hydrochlorides. The UV–Vis–NIR absorption spectrum was analyzed and the optical band gap energy was found to be 3.8 eV. The crystal exhibits sharp emission peak at 388 nm. The thermal characteristics of crystals were studied by TG-DTA, which indicate that there is no weight loss up to 201 °C. Surface laser damage threshold value of title compound was estimated using high power Q-switched Nd:YAG laser operating at 1064 nm. Dielectric and photoconductivity studies were also carried out for the grown crystals.

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