Self-assembled supramolecular synthons of 2,6 diaminopyridinium tosylate

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 P2(1)/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 A degrees 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 (beta) and third-order nonlinear susceptibility (chi((3))) were measured by Z-scan technique.