Optically transparent and thermally stable nonlinear optic chromophores featuring a thieno[2,3-b]thiophene donor |
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Authors: | Sabir H. Mashraqui Shailesh Ghadigaonkar A. Sri Ranjini P.K. Das |
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Affiliation: | a Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz-E, Mumbai 400 098, Maharashtra, India b Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India |
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Abstract: | A thieno[2,3-b]thiophene core has been utilized as a π-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 λ/2 of 532 nm, thereby conforming to the nonlinearity-transparency trade-off. Second order molecular nonlinearity, β measured by Hyper-Rayleigh scattering technique was found in the range of 9.58-47.66×10−30 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≥275 °C, indicating high thermal stability. |
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Keywords: | Nonlinear optics Push-pull thieno[2,3-b]thiophenes Synthesis UV-visible First hyperpolarizability Hyper-Rayleigh scattering technique Kurtz powder method Thermal decomposition |
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