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This paper characterizes a novel thiophene-EDTT conjugated compound using electrochemical and optical methods. The monomer 5,7-bis(3-hexylthiophen-2-yl)-2,3-dihydrothieno[3,4-b][1,4]dithiine exhibits an optical band gap of 2.3 eV and electrochemical band gap of 2.27 eV. Electropolymerization via repetitive cycling produces a polymer with reduced band gap (1.81 eV) and lower oxidation potential, demonstrating enhanced conjugation length and potential for electroactive material applications.

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Abstract

Abstract Utilizing electrochemical and optical methods, a novel conjugated co-compound that contains the redox-active thiophene-EDTT units has been described. The electrochemical and spectroscopic characteristics of the molecule 5,7-bis(3-hexylthiophen-2-yl)-2,3-dihydrothieno[3,4-b][1, 4]dithiine are covered in this article. Ethylene3,4-dioxythiophene (EDTT), which is bound by bis-hexylthiophene units, appears as the central core. Tetrabutylammonium hexafluorophosphate (Bu 4 NPF 6 ) 0.1 M was used as the supporting electrolyte in cyclic voltammetry to study the material's redox properties, and electronic absorption Spectra in acetonitrile solution was used to study the material's optical properties. The monomer's electrochemical characteristics have resulted in a lower oxidation potential than its polymer. When compared to the polymer state, the optical band gap of the monomer has demonstrated a significant change.

Keywords

ElectrochemistryRedoxThiophene

Identifiers

DOI
10.21203/rs.3.rs-2203694/v1
Journal
Research Square
Year
2022