Self-assembled supramolecular synthons of 2,6 diaminopyridinium tosylate

Abstract

A novel organic nonlinear optical crystal, 2,6 diaminopyridinium tosylate (2,6DPT), was synthesized and grown by the slow evaporation method. Formation of the new crystalline compound was confirmed by single-crystal X-ray diffraction study. The title compound (2,6DPT) crystallizes in the monoclinic crystal system with space group of P21/c. The crystalline perfection of the as-grown crystal was assessed by high-resolution X-ray diffraction study and the quality of it is reasonably good. The thermal stability of 2,6DPT is found to be 180 °C by thermogravimetric and differential thermal (TG–DTA) analyses. The specific heat capacity of 2,6DPT is found to be 3.86 J g−1 K−1. UV–Vis–NIR spectral study showed that the grown crystal is transparent in the entire visible region with the lower cut-off wavelength of 380 nm. The laser-induced surface damage threshold of grown crystal was measured to be 0.2538 GW cm−2 for 1064 nm Nd:YAG laser radiation. Nonlinear refractive index (n 2), absorption coefficient (β) and third-order nonlinear susceptibility (χ(3)) were measured by Z-scan technique.