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Tuning the intramolecular charge transfer (ICT) process in push-pull systems: effect of nitro groups

Panja, Sumit Kumar and Dwivedi, Nidhi and Saha, Satyen (2016) Tuning the intramolecular charge transfer (ICT) process in push-pull systems: effect of nitro groups. In: RSC ADVANCES, 6 (107). pp. 105786-105794.

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Official URL: http://dx.doi.org/10.1039/c6ra17521j

Abstract

The intramolecular charge transfer (ICT) process in donor-acceptor systems has tremendous importance in various physical and biological systems. Three nitrophenolate salts were synthesized and studied here. The ICT and pi -> pi* transition processes were identified in these derivatives using UV-Vis spectroscopy and theoretical calculations. It was observed that by simple substitution with nitro groups, one can generate and control the ICT process by regulating the charge distribution over the molecule. While for a monosubstitute nitro derivative, only one ICT band was observed, additional ICT processes can be generated at will by introducing a second nitro group. The intensity of this second ICT channel can be regulated with introduction of a third nitro group. Further, the association constants and solvation processes for these potassium nitrophenolate derivatives were found to be drastically dependent on the number of ICT channels present in the molecule. Theoretical studies (MEP analysis) support the experimental observations presented here. The results show that by simply introducing additional acceptor groups to the system, one can tune the ICT band efficiently in a conjugate system.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 02 Jan 2017 11:28
Last Modified: 02 Jan 2017 11:28
URI: http://eprints.iisc.ac.in/id/eprint/55660

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