Derivatives of quinolinium iodide have been found to exhibit second-order nonlinear optical (NLO) response in their crystalline form. The quaternary amine functionality is introduced as an electron-withdrawing group in NLO-active chromophores. While their electron-accepting capabilities are somewhat weaker than those of the nitro group, these organic;salts show a much more favorable transparency-nonlinearity tradeoff for blue second harmonic generation (SHG) NLO applications, Here we present crystal growth and characterization via X-ray diffraction (XRD), NMR, FTIR, and optical spectroscopy measurements. Experimental linear optical features are fully consistent with INDO/SCI-SOS theoretical calculations. These latter provide a rationale for the NLO response of these materials. Calculations predict a sizable molecular nonlinearity, which parallels the wavelength of the lowest charge-transfer transition. In addition, a direct correlation between SHG powder response to the beta crystallographic angle is observed.

Quinolinium-derived acentric crystals for second-order NLO applications with transparency in the blue

DI BELLA, Santo;
1999

Abstract

Derivatives of quinolinium iodide have been found to exhibit second-order nonlinear optical (NLO) response in their crystalline form. The quaternary amine functionality is introduced as an electron-withdrawing group in NLO-active chromophores. While their electron-accepting capabilities are somewhat weaker than those of the nitro group, these organic;salts show a much more favorable transparency-nonlinearity tradeoff for blue second harmonic generation (SHG) NLO applications, Here we present crystal growth and characterization via X-ray diffraction (XRD), NMR, FTIR, and optical spectroscopy measurements. Experimental linear optical features are fully consistent with INDO/SCI-SOS theoretical calculations. These latter provide a rationale for the NLO response of these materials. Calculations predict a sizable molecular nonlinearity, which parallels the wavelength of the lowest charge-transfer transition. In addition, a direct correlation between SHG powder response to the beta crystallographic angle is observed.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/45144
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