Abstract
Based on host-guest chemistry, a semiorganic NLO material 2-amino-5-nitropyridinium tetrafluoroborate [2A5NPFB] was synthesized and grown as single crystals. SXRD of 2A5NPFB reveals its crystal structural details as orthorhombic crystal system, Fdd2 space group, a = 22.474 (1) Å, b = 30.127 (9) Ǻ, c = 4.9584 (1) Ǻ and α = β = γ = 90°. Protonation site, charge transfer interaction and molecular structure were studied by FTIR analysis. Thermal studies predicts the melting point of 2A5NPFB as 145 °C. 2A5NPFB possess strong absorption (λmax = 350 nm) in ultraviolet region and has a broad transparency window (420–1100 nm). Kurtz and Z-scan technique explores the second and third-order NLO response of 2A5NPFB single crystal. Compared to KDP crystal, 2A5NPFB single crystal possesses 35 times higher Second Harmonic Generation efficiency. 2A5NPFB crystal exhibit saturable absorption, self defocusing and optical limiting action under continuous wave Nd:YAG green laser.
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