The new donor-acceptor type conjugated moiety, namely 3-([4-(2-Cyano-2pyridine-2yl-vinyl)-phenyl]-dodecyl-amino)-phenyl)-2-pyridine-2-yl-acrylonitrile (DPA-PA) has been synthesized according to the Knoevenagel condensation. Here dodecyloxy diphenylamine moiety acts as an electron donor and cyano-pyridyl moiety acts as an electron acceptor. These moieties are recently showing great interest in optoelectronic applications. The structure of the DPA-PA was confirmed by FT-IR, 1H NMR. The final product showed great solubility in common organic solvents such as toluene, tetrahydrofuran, ethyl acetate, dichloromethane, chloroform etc due to the dodecyl chain. The absorption maximum of DPA-PA appeared at 433 nm in chloroform solution. The optical band gap is 2.2 eV calculated from thin film absorption edge (550 nm). The photoluminescence spectra exhibited a maximum peak at 513 nm with greenish fluorescence in chloroform solution and at 541 nm as the thin film state. The emission spectra of thin film state are 28 nm red shifted with broadening peak. The lower electrochemical band gap 1.55 eV was observed by cyclic voltammetry. This type of low band gap materials has much attention for their various potential applications in optoelectronic devices. © Published under licence by IOP Publishing Ltd.

Karpagam S

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Vijai Anand A.S

Fulltext

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Synthesis and optoelectronic properties of dodecyl substituted diphenylamine and pyridine based conjugated molecule

IOP Conference Series: Materials Science and Engineering

We report on the synthesis and characterization of low band gap, blue light emitting and thermal stable conjugated oligomer by Wittig condensation. Thiophene and thiazole type of donor-acceptor based series of conjugated oligomers, Oligo-4,5-bis-[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OBTV-TZ) and Oligo-2,4,5-Tris–[2-[5-[2-thiophene-2-yl-vinyl]thiophene-2-yl]-vinyl]-thiazole (OTTV-TZ) were synthesized. These oligomers were confirmed by FT-IR and 1H-NMR and LC/MS analysis. The effect of the number of thiophene rings on the optical, electrochemical, thermal and morphological properties of the oligomers were systematically investigated. Both oligomers were exhibited almost same absorption wavelength in methanol solution (λmax = 365 nm and 369 nm) which indicates both oligomers illustrate similar intra molecular charge transfer (ICT). In solid state, the oligomers were exhibited broadening peaks with higher onset absorptions (λmax = 600 nm and 580 nm). The photoluminescence absorption spectrum of the oligomers was observed at 433 nm and 434 nm respectively in methanol solution with blue emission. The electrochemical band gap (Egec) of the OBTV-TZ was 1.55 eV (low band gap) and OTTV-TZ was exhibited greater highest occupied molecular orbital (HOMO) value (EHOMO = −6.6 eV). Moreover morphological parameters of both oligomer film of 2D and 3D diagrams were observed by using AFM studies. © 2016, Springer Science+Business Media New York.

Journal of Fluorescence

Synthesis and Optoelectronic Properties of Thiophene Donor and Thiazole Acceptor Based Blue Fluorescent Conjugated Oligomers

Two n-type conjugated polymers of pyrazine and quinoxaline containing poly(p-phenylene vinylene) (P-1) (P-2) have been synthesized through Wittig route. Formation of the polymers were confirmed by spectral (UV-Vis, PL, FT-IR and NMR), elemental and GPC analysis. These polymers were soluble in common organic solvents such as THF, CH2Cl2, CHCl3 and CH3CN. The resulting polymers have good thermal stability upto 308 and 361 °C with the 5 % weight loss. The absorption spectrum of the polymers displayed the maximum at 398 and 414 nm, corresponding to the π-π* electronic transition of the conjugated polymer backbones. The optical band gap of these polymers found to have in the range of 2.5-2.53 eV. The photoluminescence spectrum of the polymers was observed at 487 and 505 nm in CHCl3 solution. AFM images depicted that the micrometer sized globular and triangular shaped particles can be seen from the polymer surfaces. © 2012 The Korean Fiber Society and Springer Science+Business Media Dordrecht.

Fibers and Polymers

Enhancement of processability, stability and photoluminescence performance of poly(p-phenylene vinylene) containing diazine heterocycle unit

Dyes and Pigments

Synthesis and characterization of diphenylamine derivative containing malononitrile for thermally activated delayed fluorescent emitter

ACS Applied Materials & Interfaces

Solution-Processable BODIPY-Based Small Molecules for Semiconducting Microfibers in Organic Thin-Film Transistors

Data in Brief

Synthesis of cyanopyridine based conjugated polymer

Journal	Data powered by TypesetIOP Conference Series: Materials Science and Engineering
Publisher	Data powered by TypesetIOP Publishing
ISSN	1757-8981
Open Access	Yes