Abstract
The Ultraviolet-visible (UV-Vis) spectra indicate that anthracenyl chalcones (ACs) have high maximum wavelengths and good transparency windows for optical applications and are suitable for optoelectronic applications owing to their HOMO–LUMO energy gaps (2.93 and 2.76 eV). Different donor substituents on the AC affect their dipole moments and nonlinear optical (NLO) responses. The positive, negative, and neutral electrostatic potential regions of the molecules were identified using molecular electrostatic potential (MEP). The stability of the molecule on account of hyperconjugative interactions and accompanying charge delocalization was analyzed using natural bond orbital (NBO) analysis. Open and closed aperture Z-scans were performed using a continuous-wave frequency-doubled diode-pumped solid-state (DPSS) laser to measure the nonlinear absorption and nonlinear refractive index coefficients, respectively. The valley-to-peak profile of AC indicated a negative nonlinear refractive index coefficient. The obtained single crystals possess reverse saturation absorption due to excited-state absorption. The structural and nonlinear optical properties of the molecules have been discussed, along with the role of anthracene substitution for enhancing the nonlinear optical properties. The calculated third-order susceptibility value was 1.10 x10-4 esu at an intensity of 4.1 kW/cm2, higher than the reported values for related chalcone derivatives. The NLO response for both ACs offers excellent potential in optical switching and limiting applications.
Highlights
Nonlinear optics is a key area in science and technology for modern hi-tech applications
Anth-1 and Anth-2 were synthesized with different scaffolding positions of donor anthracene groups of 9-anthracenecarboxaldehyde and 9-acetylanthracene systems, respectively
These anthracene systems were attached to different substituents of 1,4-benzodioxan-6-yl methyl ketone and 2,2-bithiophene-5-carboxaldehyde, which act as electrondonating moieties
Summary
Nonlinear optics is a key area in science and technology for modern hi-tech applications. Organic materials have delocalized electrons in the n!π or π!π orbitals resulting in better nonlinear optical (NLO) properties than inorganic materials [1,2,3,4]; further, they have attracted the continued interest of researchers to develop better organic nonlinear optical materials [5]. Fused ring effect on optical nonlinearity of anthracenyl chalcone had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript
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