Kousalya Devi V, Kousi F, Mujahid Alam M, Sambasivam S, Ramalingam G, Abith M, Sabari Girisun TC, Sudhahar S. Third-order NLO properties and optical limiting behavior of p-toluidinium 2,4-dichlorobenzoate organic single crystal.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024;
305:123527. [PMID:
37847934 DOI:
10.1016/j.saa.2023.123527]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 08/31/2023] [Accepted: 10/11/2023] [Indexed: 10/19/2023]
Abstract
This research work focuses on the synthesis and characterization of p-toluidinium 2,4-dichlorobenzoate (PTDA), organic non-linear optical crystal grown at room temperature. Single crystal X-ray diffraction (SCXRD) analysis was used to analyze the lattice parameters under the centrosymmetric space group of P121/c1 with a monoclinic crystal system. The crystalline nature and phase identification of the sample was analyzed by powder X-ray diffraction (PXRD) analysis. FT-IR and 1H NMR were used to identify the functional groups and various vibrations present in the grown crystal. The cut-off wavelength was observed at 284 nm from the transmittance spectrum, and the optical bandgap value (4.06 eV) was also determined from UV-visible analysis. TG-DTA analysis was carried out to understand its thermal properties. The mechanical strength of the material plays an important role in fabricating devices. Open-aperture Z-scan analysis was taken in order to get its third-order nonlinearity using Nd: YAG nanopulsed laser. PTDA crystal exhibits reverse saturable absorption and shows two-photon absorption- induced optical limiting behavior. Theoretical calculations were done by using Gaussian 09 software with a basic set of B3LYP/6-311G++ (d, p) to provide optimized molecular geometry, Frontier Molecular Orbital (FMO), and NBO analysis.
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