Single crystals of admixtured phthalates of sodium and potassium called as sodium potassium acid phthalate (NaKP) have been successfully grown from aqueous solution for the first time. The grown crystals were characterized by single crystal X-ray diffraction. The crystal belongs to Trigonalcrystallographic system with a non-centrosymmetric space group P-31c. Cell parameters are a = 16.731(3) Å; b = 16.731(3) Å; c = 18.276(5) Å α = 90°; β= 90°; γ= 120°; V=4430.5(17) ų. The vibrational structure of the compound has been elucidated through FTIR spectrum.  Optical absorption properties of the crystal have been studied from UV-Vis-NIR measurements. Mass spectrometric analysis provides the molecular weight of the compound and possible ways of fragmentations that normally occur in the compound during thermal process have also been analyzed. Thermal stability of the crystal was studied by simultaneous TGA/DTA measurements. These preliminary results suggests that the crystal could be a potential candidate for higher order harmonic oscillators.

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