Preprint Article Version 1 This version is not peer-reviewed

Selenophene Bearing Low Band Gap Conjugated Polymers: Tuning Optoelectronic Properties via Fluorene and Carbazole as Donor Moieties

Version 1 : Received: 23 May 2018 / Approved: 24 May 2018 / Online: 24 May 2018 (05:32:43 CEST)

How to cite: Yasa, M.; Goker, S.; Toppare, L. Selenophene Bearing Low Band Gap Conjugated Polymers: Tuning Optoelectronic Properties via Fluorene and Carbazole as Donor Moieties. Preprints 2018, 2018050331 (doi: 10.20944/preprints201805.0331.v1). Yasa, M.; Goker, S.; Toppare, L. Selenophene Bearing Low Band Gap Conjugated Polymers: Tuning Optoelectronic Properties via Fluorene and Carbazole as Donor Moieties. Preprints 2018, 2018050331 (doi: 10.20944/preprints201805.0331.v1).

Abstract

In this study, two donor-acceptor (D-A) type conjugated polymers namely PQSeCz and PQSeFl were designed and synthesized. Selenophene was incorporated as a π -bridge, quinoxaline as an acceptor unit while carbazole and fluorene were used as the donor units. Polymers were synthesized via palladium catalyzed Suzuki polymerization reaction. All molecules were characterized by 1H and 13C NMR Spectroscopy. The weight and number average molecular weights of the two polymers were determined by gel permeation chromatography (GPC). Electrochemical and spectroelectrochemical characterizations of the polymers were performed to investigate their optoelectronic properties. Oxidation potentials were 1.15 V/ 0.82 V and 1.11 V/ 0.82 V for PQSeCz and PQSeFl respectively, while reduction potentials were -1.26 V /-1.14 V and -1.48 V/ -1.23 V, respectively. In the visible region, maximum absorption wavelengths for the two polymers were 551 nm and 560 nm, respectively. Optical band gaps (Egop) were found from the lowest energy π – π∗ transition onsets as 1.71 eV and 1.58 eV, respectively. Both polymers showed good solubility in common solvents.

Subject Areas

conjugated polymer; selenophene; fluorine; carbazole band; gap; Suzuki coupling

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