An organic single crystal, guanidinium 4-aminobenzene sulfonate (GuAS) was grown using slow evaporation solution growth technique. The cell parameters of the titular crystal were determined using single crystal X-ray diffraction study. The solid state parameters such as Penn gap energy, Fermi energy, plasma energy etc., were calculated. The optical property of the grown crystal was studied using UV-vis-NIR spectroscopy. The other optical constants such as reflectance, optical and electrical conductivities of the grown crystal were determined. The mechanical behavior of the grown crystal was ascertained using fracture toughness and brittle index.

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