Abstract
A new organic charge transfer molecular complex salt of o-toluidinium picrate (OTP) was synthesised and the single crystals were grown by the slow solvent evaporation solution growth technique using methanol as a solvent at room temperature. Formation of the new crystal has been confirmed by single crystal X-ray diffraction (XRD) and NMR spectroscopic techniques. The crystal structure determined by single crystal X-ray diffraction indicates that both the cation and the anion are interlinked to each other by three types of intermolecular hydrogen bonds, namely N(4)-H(4A)···O(7), N(4)-H(4B)···O(5) and N(4)-H(4C)···O(7). The title compound (OTP) crystallizes in monoclinic crystal system with the centrosymmetric space group P21/c. Fourier transform infrared (FT IR) spectral analysis was used to confirm the presence of various functional groups in the grown crystal. The optical properties were analyzed by the UV-Vis-NIR and fluorescence emission studies.
Highlights
A new organic charge transfer molecular complex salt of o-toluidinium picrate (OTP) was synthesised and the single crystals were grown by the slow solvent evaporation solution growth technique using methanol as a solvent at room temperature
The structure is based on asymmetric part of o-Toluidinium picrate which contains 2-methyl anilinium cation and picrate anion connected by three intermolecular N-H····O hydrogen bonds with a donor-acceptor distance of 2.7697(19), 2.853(2) and 2.762(2) Å
Was synthesized and the single crystals of it were grown by slow evaporation solution growth technique using methanol as the solvent
Summary
The organic materials with aromatic ring, which are of great interest for second and third-order nonlinear optical applications due to their high nonlinearity, high optical damage threshold and their ultrafast, almost purely electronic response. Mulliken suggested that the charge transfer interactions from two aromatic molecules can arise from the transfer of an electron from Lewis base to Lewis acid and these complexes have attracted great attention for nonlinear optical materials. Proton transfer interactions between electron donor and electron acceptor molecules absorb radiation in the visible region leading to the formation of intensely colored charge transfer complexes [5,6,7,8,9,10]. Picric acid forms crystalline picrates of various organic molecules through ionic and hydrogen bonding and π-π interactions and the
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