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Potential Third-Order Nonlinear Optical Response Facilitated by Intramolecular Charge Transfer in a Simple Schiff
Saima Kamaal1, Mohd Mehkoom2, Arif Ali1
1Department of Applied Chemistry, ZHCET, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India.
ACS Omega
|March 15, 2021
Summary
A novel Schiff base, 4-[(2-hydroxy-3-methoxybenzylidene) amino] benzoic acid (L1), exhibits significant third-order nonlinear optical (NLO) properties. This material shows potential for optoelectronic devices and laser protection applications.
Area of Science:
- Materials Science
- Optoelectronics
- Supramolecular Chemistry
Background:
- Schiff bases are versatile organic compounds with diverse applications.
- Nonlinear optical (NLO) materials are crucial for advanced photonic technologies.
- Understanding supramolecular interactions is key to designing functional materials.
Purpose of the Study:
- To synthesize and characterize a novel Schiff base, 4-[(2-hydroxy-3-methoxybenzylidene) amino] benzoic acid (L1).
- To investigate the third-order nonlinear optical (NLO) properties of L1.
- To explore the potential applications of L1 in optoelectronic devices and laser protection.
Main Methods:
- Synthesis via condensation reaction.
- Characterization using Fourier transform infrared spectroscopy, UV-vis spectroscopy, and single-crystal X-ray diffraction.
- DFT/B3LYP calculations and Z-scan technique for NLO property evaluation.
Main Results:
- L1 was successfully synthesized and confirmed to exist in a zwitterionic form.
- Third-order NLO properties, including nonlinear refractive index, nonlinear absorption coefficient, and third-order NLO susceptibility, were quantified.
- NLO parameters showed a near-linear dependence on concentration and laser power.
Conclusions:
- The synthesized Schiff base L1 possesses significant third-order NLO properties.
- L1 is a promising candidate for applications in optical switches, data storage, sensors, and as an optical limiter.
- The study highlights the interplay between molecular structure, supramolecular assembly, and NLO behavior.
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