BORIS Theses

BORIS Theses
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Investigation on Intramolecular Charge Transfer in π-Conjugated Donor and Acceptor Ensembles

Zhou, Ping (2022). Investigation on Intramolecular Charge Transfer in π-Conjugated Donor and Acceptor Ensembles. (Thesis). Universität Bern, Bern

22zhou_p.pdf - Thesis
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π-Conjugated donor (D) and acceptor (A) ensembles have been widely investigated in the fields of (bio)chemistry, physics, medicine, materials chemistry and nanoscience because of their unique optical and electrochemical properties. Electronic interactions between D and A units have been widely explored for the development of advanced functional materials. Therefore, diverse π-conjugated ensembles containing different donors such as benzodifuran (BDF), tetrathiafulvalene (TTF), triphenylamine (TPA), and acceptors including 2,1,3- benzothiadiazole (BTD), perylene diimide (PDI), tetraazapyrene (TAP) and dipyrrolylquinoxaline (DPQ) have been investigated. It has been demonstrated that HOMO and LUMO energy levels and band gaps critically depend on the intrinsic electronic properties of D and A units as well as the nature of the linker between them. To optimize the electronic communication between D and A units for potential applications in molecular (opto)electronics, a variety of π-conjugated ensembles with different D-A architectures have been designed, synthesized, and characterized in this thesis. Importantly, efficient synthetic approaches to functionalize the TAP core via halogenation, hydrolysis, oxidation, and condensation have been developed, allowing the preparation of various kinds of TAP-based D-A molecules. Our keen interest in such π-conjugates has led us to comprehensively investigate the intramolecular charge-transfer (ICT) interactions through-bond or through-space between D and A moieties by UV-Vis-NIR spectroscopy, cyclic voltammetry (CV), transient absorption spectroscopy (TAS) and density functional theory (DFT) calculations.

Item Type: Thesis
Dissertation Type: Cumulative
Date of Defense: 20 September 2022
Subjects: 500 Science > 540 Chemistry
500 Science > 570 Life sciences; biology
Institute / Center: 08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)
Depositing User: Hammer Igor
Date Deposited: 11 Oct 2022 12:24
Last Modified: 11 Oct 2022 12:24

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