Synthesis and structures of thieno[2,3-b]thiophene incorporated [3.3]dithiacyclophanes. Enhanced first hyperpolarizability in an unsymmetrically polarized cyclophane |
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Authors: | Sabir H Mashraqui Yogesh S Sangvikar |
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Institution: | a Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz-E, Mumbai 400098, India b Department of Chemistry, University of Groningen, Nijenborg 4, 9747 AG, Groningen, The Netherlands |
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Abstract: | Dithiacyclophanes incorporating thieno2,3-b]thiophene have been synthesized, in order to investigate the nonlinear optical properties of donor-acceptor cyclophane 7. Cyclophane 7 displayed significantly higher first hyperpolarizability β (21.6 × 10−30 esu) compared to model 10 (9.58 × 10−30esu). Relatively higher β in 7 presumably arises from an extra electron redistribution arising from through-space charge transfer, a feature lacking in 10. Moreover, the thermal decomposition temperature of 7 (300 °C) is higher than that reported for the NLO prototype DANS (295 °C). |
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Keywords: | Cyclophanes Thieno[2 3-b]thiophene X-ray structures UV-vis First hyperpolarizability Through-space charge redistribution |
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