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- W2889078600 abstract "Abstract Twisted intramolecular charge‐transfer (TICT) chromophores exhibit extraordinary hyperpolarizabilities, β , and are therefore promising for electro‐optic technologies. Nevertheless, centrosymmetric aggregate formation severely diminishes β in concentrated solutions or in polymer matrices. Herein, the remarkable effects of organic salts on the linear and nonlinear optical response of a high β benzimidazolium‐based TICT chromophore, B2TMC‐2 , are reported. Addition of Bu 4 P + Br − to B2TMC‐2 solution in CHCl 3 induces a halochromic blueshift, primarily reflecting interactions between Bu 4 P + Br − and the B2TMC‐2 cationic portion. DC electric‐field induced second‐harmonic generation (EFISH) measurements on B2TMC‐2 +Bu 4 P + Br − solution reveal a large μβ =−22,160×10 −48 esu, unprecedented for any chromophore with such a broad optical transparency window. Moreover, Bu 4 P + Br − is shown to suppress B2TMC‐2 aggregation, thereby preserving high μβ in concentrated solutions. This phenomenon should be applicable to many other NLO chromophores." @default.
- W2889078600 created "2018-09-07" @default.
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- W2889078600 date "2018-10-01" @default.
- W2889078600 modified "2023-10-14" @default.
- W2889078600 title "Organic Salts Suppress Aggregation and Enhance the Hyperpolarizability of a π‐Twisted Chromophore" @default.
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- W2889078600 doi "https://doi.org/10.1002/chem.201804365" @default.
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