Optically Transparent And Thermally Stable Nonlinear Optic Chromophores Featuring A Thieno[2,3-b]thiophene Donor

Content Provider	Indian Institute of Science (IISc)
Author	Mashraqui, Sabir H. Ghadigaonkar, Shailesh Ashraf, Mohamed Ranjini, Sri A. Ghosh, Sampa Das, P. K.
Copyright Year	2007
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 275À C, indicating high thermal stability.
File Format	PDF
Journal	PeerReviewed
Language	English
Publisher	Elsevier Ltd
Publisher Date	2007-10-01
Access Restriction	Authorized
Subject Keyword	Inorganic & Physical Chemistry
Content Type	Text
Resource Type	Article