Issue 11, 2025

Unveiling electronic and remarkable non-linear optical properties of boron–nitrogen carbazole-based compounds via modification of π-linker and donor units: a DFT study

Abstract

Boron–nitrogen carbazole (BNCz) based aromatic chromophores have been considered as promising materials in non-linear optical domains due to their distinctive electronic and charge-transfer capabilities. This study presents the electronic and non-linear optical properties of BNCz-based compounds (BTNC–BNPZ). Additionally, a new series of four BNCz-based compounds (BNTP–BNTO) with D–π–A framework was designed by modifying the donors and π-spacer. Structural optimization and optoelectronic properties of BNCz based compounds were determined using density functional theory/time-dependent density functional theory (DFT/TD-DFT) calculations at M06/6-311G(d,p) level. The optimized structures were used to perform frontier molecular orbitals (FMOs), density of states (DOS), transition density matrix (TDM), UV-Visible and non-linear optical (NLO) analyses of examined compounds. The red-shifted absorption spectrum (412.854–566.138 nm) combined with a suitable energy gap (2.784–3.774 eV) facilitates significant charge migration from HOMO to LUMO. The global reactivity descriptors revealed notable softness and significant chemical reactivity in all above-mentioned chromophores. Among all the studied compounds, BNPZ displayed the narrowest band gap (2.784 eV), the highest absorption peak (566.138 nm), and lowest excitation energy (2.190 eV), highlighting its remarkable electronic characteristics. Furthermore, DOS visualizations and TDM heat maps support the FMO findings, confirming the presence of charge densities in a chromophore. All the compounds showed an increased exciton dissociation rate due to their lower exciton binding energy values (Eb = 0.771–0.480 eV). Moreover, NBO analysis revealed that enhanced hyperconjugation and strong intramolecular interactions played a crucial role in stabilizing the studied compounds. Among all the derivatives, BNTP exhibited the highest βtot (74.0 × 10−30 esu) and γtot (81.1 × 10−35 esu) values, suggesting its promising potential as an NLO material.

Graphical abstract: Unveiling electronic and remarkable non-linear optical properties of boron–nitrogen carbazole-based compounds via modification of π-linker and donor units: a DFT study

Supplementary files

Article information

Article type
Paper
Submitted
05 Feb 2025
Accepted
11 Mar 2025
First published
17 Mar 2025
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2025,15, 8262-8274

Unveiling electronic and remarkable non-linear optical properties of boron–nitrogen carbazole-based compounds via modification of π-linker and donor units: a DFT study

S. Jamal, N. Raza, M. Khalid and A. A. C. Braga, RSC Adv., 2025, 15, 8262 DOI: 10.1039/D5RA00864F

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