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| - Propeller-Shaped Octupolar Molecules Derived fromTriphenylbenzene for Nonlinear Optics: Synthesis andOptical Studies
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| - Nanoscale propeller-shaped octupoles derived from a triphenylbenzene core have been investigated. By controlling the intramolecular charge transfer between the molecules center and periphery, octupolar compounds displaying very large first-order hyperpolarizabilities (up to ||β|| = 810 × 10-30 esu) while maintaining wide transparency in the visible region have been obtained. Their nonlinearities were found to be correlated to their solvatochromic behavior.
- Nanoscale propeller-shaped conjugated molecules based on a central triphenylbenzene corebearing three oligomeric phenylene−vinylene branches having either electron-donating orelectron-withdrawing peripheral groups have been synthesized. These octupolar derivativesshow definite solvatochromic behavior (in absorption and even more in emission), whichreveals a multidimensional intramolecular charge transfer (MDICT) taking place betweenthe center and the periphery of the molecules. Correlations between the solvatochromismmagnitude and the nonlinear responses (first-order hyperpolarizabilities β) of such derivativeshave been established. Accordingly, boosting of the MDICT phenomenon (by means ofelongation of the branches and benefit from appropriate peripheral groups) allowedachievement of very high hyperpolarizabilities while maintaining wide transparency in thevisible region (up to ||β|| = 810 × 10-30 esu for λmax= 377 nm).
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