ItemArticle

Bithiophene and 3,4-Ethylenedioxythiophene Copolymers with Biphenyl and Bis-[octyloxy]benzene acceptors for NLO Application

Title
Bithiophene and 3,4-Ethylenedioxythiophene Copolymers with Biphenyl and Bis-[octyloxy]benzene acceptors for NLO Application
Creator
Baby, Anju Maria; Sreekumar, Krishnapillai; Mohammed Sadik, N.K.; Theresa, Letcy V.
Description
Two groups of thiophene-based donoracceptor (DA) type conjugated copolymers with low band gaps were designed and synthesized through direct arylation. Biphenyl and bis(octyloxy)benzene were incorporated as electron-deficient units to effectively lower the band gaps. The HOMOLUMO energy levels of the resulting copolymers were theoretically determined using DFT calculations at the HSE06 and B3LYP levels with a 631G(d,p) basis set. The copolymers were characterized by UVVis, FT-IR, fluorescence, and H NMR spectroscopy. Their thermal stability was assessed using thermogravimetric analysis, which confirmed that the bithiophene-based copolymers P(BT-BP) and P(BT-DOB) were highly thermally stable. Additionally, P(BT-DOB) and P(EDOT-DOB) exhibited solvatochromic behavior in varying toluene/acetonitrile solvent mixtures. Third-order nonlinear optical properties of P(BT-BP), P(EDOT-BP), P(BT-DOB), and P(EDOT-DOB) were studied using an open-aperture Z-scan method at 532 nm in DMSO. These copolymers showed reverse saturable absorption with low optical threshold values. 2025 Elsevier B.V.
Source
Journal of Molecular Structure;Volume;1350;Issue;;Article No.;143889;
Date
01-01-2026
Publisher
Elsevier B.V.
Subject
Copolymer; DFT Theory; Lifetime measurement; Non-linear optical properties; Solvatochromism
Coverage
Baby A.M., Department of chemistry, St.Thomas College, Pala, Kerala, Kochi, 686574, India; Sreekumar K., Department of Chemistry, Cochin University of Science and Technology, Kerala, Kochi, 682021, India; Mohammed Sadik N.K., Department of Chemistry, Cochin University of Science and Technology, Kerala, Kochi, 682021, India; Theresa L.V., Department of Chemistry, Christ University, Banglore, India
Rights
Restricted Access; Hardcopy may be available in the library
Relation
ISSN: 222860; CODEN: JMOSB
Format
online
Language
English
Type
Article

Citation

Baby, Anju Maria; Sreekumar, Krishnapillai; Mohammed Sadik, N.K.; Theresa, Letcy V., “Bithiophene and 3,4-Ethylenedioxythiophene Copolymers with Biphenyl and Bis-[octyloxy]benzene acceptors for NLO Application,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22405.

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