Add time:08/29/2019         Source:sciencedirect.com

A new proton transfer complex was synthesized by the reaction between 2-amino-3-methyl pyridine with 3,5-dinitro benzoic acid in methanol solvent at room temperature. Chemical composition and stoichiometry of the synthesized complex 2-amino-3-methylpyridinium 3,5-dinitrobenzoate (AMPDB) were verified by CHN analysis. The AMPDB crystals were subjected to FT-IR spectral analysis to confirm the functional groups in the compound. UV–Vis–NIR spectral studies revealed that the AMPDB has a large optical transparency window. Single crystal XRD analysis reveals that AMPDB belongs to a monoclinic system with P21/c space group. NMR spectroscopic data indicate the exact carbon skeleton and hydrogen environment in the molecular structure of AMPDB. The thermal stability of the compound was investigated by thermogravimetry (TG). Computational studies such as optimisation of molecular geometry, natural bond analysis (NBO), Mulliken population analysis and HOMO-LUMO analysis were performed using Gaussian 09 software by B3LYP method at 6-311 G(d p) basis set. The first order hyperpolarizability (β) value is 37 times greater than that of urea. The optical nonlinearities of AMPDB have been investigated by Z-scan technique with He-Ne laser radiation of wavelength 632.8 nm. Hirshfeld analysis indicate O⋯H/H⋯O interactions are the superior interactions confirming intensive hydrogen bond net work.

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