Synthesis and Nonlinear Optical Behavior of Thermally Stable Chromophores Based on 9,9-Dimethyl-9 H-fluoren-2-amine: Improving Intrinsic Hyperpolarizability through Modulation of "Push-Pull"

Shivani, S and Mishra, A and Kaur, P and Singh, K (2022) Synthesis and Nonlinear Optical Behavior of Thermally Stable Chromophores Based on 9,9-Dimethyl-9 H-fluoren-2-amine: Improving Intrinsic Hyperpolarizability through Modulation of "Push-Pull". In: ACS Omega, 7 (43). pp. 39045-39060.

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Abstract

Improvement in the first hyperpolarizability (βHRS) as well as intrinsic hyperpolarizability (βint) of chromophores based on 9,9-dimethyl-9H-fluoren-2-amine through modulation of the conjugation pathway is described. A series of six novel chromophores with "linear"conjugation showed significant enhancement of βHRS as well as βint compared to the counterparts lacking a "linear"conjugation but having an identical combination of donor, acceptor, and the intervening π-conjugated linker. The hyperpolarizability (βHRS as well as βint) values of the new series measured using hyper-Rayleigh scattering exceeded the apparent limit set by the latter set of fluorene-based chromophores. The experimental results are analyzed and interpreted in the context of linear optical properties, single-crystal X-ray analysis, electrochemistry, etc. and corroborated by theoretical studies. We find that modulation of the "push-pull"of the conjugation pathway in these donor-acceptor chromophores compares favourably with the corresponding changes in the optical gaps, transition dipole moments, and dipole moment difference between the ground and excited states.

Item Type:	Journal Article
Publication:	ACS Omega
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	16 Dec 2022 09:39
Last Modified:	16 Dec 2022 09:39
URI:	https://eprints.iisc.ac.in/id/eprint/78474

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