Optically transparent and thermally stable nonlinear optic chromophores featuring a thieno[2,3-b]thiophene donor

Mashraqui, Sabir H and Ghadigaonkar, Shailesh and Ashraf, Mohamed and Sri Ranjini, A and Ghosh, Sampa and Das, PK (2007) Optically transparent and thermally stable nonlinear optic chromophores featuring a thieno[2,3-b]thiophene donor. In: Tetrahedron, 63 (40). pp. 10011-10017.

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Abstract

A thieno[2,3-b]thiophene core has been utilized as a \pi-donor component to design two series of push–pull thienothiophenes by introducing various acceptor groups either via olefinic or aza-spacers. The molecules show a UV–visible cut-off wavelength below the second harmonic generation (SHG) at $ \lambda /2$ of 532 nm, thereby conforming to the nonlinearity–transparency trade-off. Second order molecular nonlinearity, \beta measured by Hyper-Rayleigh scattering technique was found in the range of $9.58–47.66 X 10^{-30} esu$, while the Kurtz powder technique produced signals of the order of 0.43–1.02 U. Thermal decomposition temperatures measured by differential scanning calorimetry revealed decomposition temperatures \geq 275° C, indicating high thermal stability.

Item Type:	Journal Article
Publication:	Tetrahedron
Publisher:	Elsevier Ltd
Additional Information:	Copyright of this article belongs to Elsevier Ltd.
Keywords:	Nonlinear optics;Push–pull thieno[2,3-b]thiophenes;Synthesis;UV–visible;First hyperpolarizability;Hyper-Rayleigh scattering technique;Kurtz powder method;Thermal decomposition
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	06 Feb 2008
Last Modified:	19 Sep 2010 04:42
URI:	http://eprints.iisc.ac.in/id/eprint/12974

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