Synthesis, linear and non-linear optical properties of “push-pull” chromophores based on 9,9-dimethyl-9H-fluoren-2-amine

Shivani, Shivani and Mishra, A and Kumar, V and Kaur, P and Singh, K (2022) Synthesis, linear and non-linear optical properties of “push-pull” chromophores based on 9,9-dimethyl-9H-fluoren-2-amine. In: Dyes and Pigments, 200 .

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Abstract

Photophysical properties including the first hyperpolarizability of a series of chromophores (SP1-SP5) possessing “push-pull” type conjugation were investigated to evaluate the proficiency as non-linear optically active materials. The compounds are based on the 9,9-dimethyl-9H-fluoren-2-amine platform, which acts as a donor unit and different types of acceptors have been incorporated to design SP1-SP5. The first hyperpolarizability (βHRS) value was in the range of 102 × 10−30 esu to 174 × 10−30 esu, and the trends in the experimental βHRS have been rationalized in terms of the difference in the dipole moment (Δμge) of the ground and excited state, oscillator strength of the contributing absorption bands and the band gaps. The intrinsic efficiency of the non-linear response of these dipolar compounds possessing a single major dipolar hyperpolarizability tensor component βzzz was also determined from the intrinsic hyperpolarizability, a real figure of merit of the non-linear optical response. Comparison of the experimental off-resonant first hyperpolarizability, βHRS, as well as the intrinsic hyperpolarizability of this set of D-π-A chromophores, lacking linear conjugation, revealed advantage over the already reported counterparts based on benzothiazole platform.

Item Type:	Journal Article
Publication:	Dyes and Pigments
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Chromophores; Energy gap; Excited states; Nonlinear optics; Optical properties, First hyperpolarizabilities; Fluorenes; Hyper Rayleigh scattering; Hyperpolarizabilities; Intrinsic hyperpolarizability; Non linear; Nonlinear optical properties; Photophysical properties; Push pull; Push-pull chromophores, Harmonic generation, Absorption Spectra; Chromophores; Dipoles; Efficiency; Fluorenes; Optical Properties; Set
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	24 Jun 2022 12:05
Last Modified:	24 Jun 2022 12:05
URI:	https://eprints.iisc.ac.in/id/eprint/73717

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