Faculty Publications
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Item Optical, Electrochemical and Thermal Studies of Conjugated Polymers Synthesized by Eutectic Melt Reaction(Springer New York LLC barbara.b.bertram@gsk.com, 2017) Bathula, C.; Buruga, K.; Kang, Y.; Khazi, I.A.M.This paper reports on the synthesis of a novel donor–acceptor conjugated polymers, P1 and P2 by solvent free eutectic melt polymerization reaction. Triisopropylsilylethynyl(TIPS) substituted benzo[1,2-b:4,5-b?]dithiophene(BDT) is used as donor, thienithiophene(TT) and thienopyrroledione(TPD) are utilized as acceptors for demonstrating eutectic polymerization. The most important fact in the solvent-free reaction between solid reactants actually proceeds through bulk liquid phases. Such liquid phases are possible due to the formation of eutectics between the reactants and product(s) and any evolution of heat. Naphthalene is explored in this reaction for forming eutectics with the reactants, resulting in desired polymers. Thermal stability, optical and electrochemical properties of these polymers were determined. Optical band gaps of the polymers were found to be 1.58 and 1.65 eV. Electrochemical studies by cyclic voltametry experiment revealed HOMO and LUMO energy levels to be ?5.22, ?5.60 eV, and ?3.76, ?4.16 eV, respectively. The polymers were thermally stable up to 285–400 °C. Thermal, optical and electrochemical studies indicated these materials to be promising candidates in organic electronic applications. © 2017, Springer Science+Business Media New York.Item Microwave assisted synthesis of bithiophene based donor-acceptor-donor oligomers and their optoelectronic performances(Elsevier B.V., 2017) Bathula, C.; Buruga, K.; Lee, S.K.; Khazi, I.A.M.; Kang, Y.In this article we present the synthesis of two novel bithiophene based symmetrical ? conjugated oligomers with donor-acceptor-donor (D-A-D) structures by microwave assisted PdCl2(dppf) catalyzed Suzuki coupling reaction. These molecules contain electron rich bithiophene as a donor, dithienothiadiazole[3,4-c]pyridine and phthalic anhydride units as acceptors. The shorter reaction time, excellent yields and easy product isolation are the advantages of this method. The photophysical prerequisites for electronic application such as strong and broad optical absorption, thermal stability, and compatible energy levels were determined for synthesized oligomers. Optical band gap for the oligomers is found to be 1.72–1.90 eV. The results demonstrated the novel oligomers to be promising candidates in organic optoelectronic applications. © 2017 Elsevier B.V.Item Selenophene based benzodithiophene polymers as potential candidates for optoelectronic applications(Elsevier Ltd, 2018) Bathula, C.; Khadtare, S.; Buruga, K.; Kadam, A.; Shrestha, N.K.; Noh, Y.-Y.This work reports on the synthesis and characterization of two novel conjugated polymers consisting of selenophene substituted benzo[1,2-b:4,5-b?]dithiophene (SeBDT) donor, and dithienothiadiazole[3,4-c]pyridine(DTPyT)-P1 or thieno[3,4]pyrroledione(TPD)-P2 acceptors. The synthesized polymers are characterized for the significant photophysical prerequisites essential for organic electronics such as strong and broad optical absorption, thermal stability, and compatible highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels. The polymers are thermally stable up to 280–370 °C, and the optical band gaps for P1, P2 calculated from their film absorption edges are found to be 1.53 and 1.84 eV, respectively. In addition, the electrochemical studies of P1, P2 reveal the HOMO and LUMO energy levels of ?5.02,-5.04 eV, and ?3.49, ?3.20 eV, respectively, suggesting these materials to be potential candidates for the applications in organic electronics. © 2017 Elsevier Ltd