Aggregation behavior in naphthalene-appended diketopyrrolopyrrole derivatives and its gas adsorption impact on surface potential

Dutta, Gitish K and Kasthuri, S and Marappan, Gobinath and Jayaraman, Surya Velappa and Sivalingam, Yuvaraj and Di Natale, Corrado and Nutalapati, Venkatramaiah (2019) Aggregation behavior in naphthalene-appended diketopyrrolopyrrole derivatives and its gas adsorption impact on surface potential. In: JOURNAL OF MATERIALS CHEMISTRY C, 7 (32). pp. 9954-9965.

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Abstract

Diketopyrrolopyrrole derivatives containing phenyl and thiophene units adorned with alkoxynaphthalene (Naph-PDPP and Naph-TDPP) were synthesized by a Suzuki cross-coupling reaction. The effect of the phenyl/thiophene units on the aggregation behavior and detailed photophysical properties were investigated by UV-visible, steady-state, and time-resolved fluorescence spectroscopy. The absorption and fluorescence spectra of Naph-PDPP and Naph-TDPP in the solid-state exhibit red-shifted spectral patterns due to strong intermolecular interactions. The concentration-dependent photophysical properties reveal the formation of J-type aggregates at higher concentrations and in the solid state. The extent of aggregate formation is higher for Naph-TDPP. DFT and TD-DFT studies showed that Naph-TDPP containing a thiophene ring in the backbone adopts a more planar geometry than Naph-PDPP and undergoes strong pi-pi stacking interactions that favor the formation of J-aggregates. Scanning Kelvin probe measurements on the thin films of Naph-PDPP and Naph-TDPP were performed (both in the dark and under visible light) upon exposure to different volatile organic vapors (ethanol and triethylamine). The study reveals that under visible light illumination, the Naph-PDPP thin film has significant gas adsorption towards ethanol vapors and alters its sign of response.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS CHEMISTRY C
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	Copyright of this article belongs to ROYAL SOC CHEMISTRY
Keywords:	FIELD-EFFECT TRANSISTORS; PROBE FORCE MICROSCOPY; HIGH-MOBILITY; ORGANIC SEMICONDUCTORS; POLYMER SEMICONDUCTORS; SOLAR-CELLS; LARGE-AREA; ACCEPTOR; DONOR; AMBIPOLAR
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	20 Nov 2019 10:39
Last Modified:	20 Nov 2019 10:39
URI:	http://eprints.iisc.ac.in/id/eprint/63594

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