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• W1986972693 abstract "A novel sequence for reversible second-order nonlinear optical (NLO) molecular switching with protonation/deprotonation has been achieved and tuned as well. The NLO switching with first hyperpolarizabilities (beta(0)) as low as 14 x 10(-30) esu (Off-phase) and as large as 1189 x 10(-30) esu (On-phase) have been computed by using density functional theory (DFT). Remarkably large differences between the beta(0) values of benzimidazole containing chromophores and their deprotonated anions have shown their significant potential for a new type of NLO molecular switching, as (1-(4-methoxyphenyl)-2-(2-thienyl)pyrrolyl)-1,3-benzimidazole anion (1(-)) has a beta(0) value computed to be 61 x 10(-30) esu, which is 4 times larger than its neutral molecule 1. This beta(0) value has been tuned up to 2028 x 10(-30) esu by effective substitutions in the derivatives of 1(-) (1a(-), 1b(-), 1c(-), and 1d(-)). Interestingly, the substituted compounds have illustrated robustly large off-on NLO switching with a difference in beta(0) values of 7, 63, 85 and 75 times larger than their neutral counterparts, respectively. TD-DFT calculations along with natural bond orbital (NBO), frontier molecular orbitals (FMOs) and molecular electrostatic potential (MEP) analyses show that the abstraction of an imido proton brings about a change in push-pull configurations resulting in a red shift for both absorption and emission spectra which subsequently leads to a high performance second-order NLO molecular switching. A similar trend of NLO switching in F(-) compounds of these chromophores has also been observed with significantly large beta(0) values having analogous electro-optical properties like deprotonated anions. Furthermore, gas-phase acidity (GPA) calculations for the neutral molecule 1 and its derivatives (1a, 1b, 1c, and 1d) have also revealed that these are rationally potent nitrogen acids and can easily be dissociated to produce stable deprotonated anions." @default.
• W1986972693 created "2016-06-24" @default.
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• W1986972693 date "2010-01-01" @default.
• W1986972693 modified "2023-10-17" @default.
• W1986972693 title "Quantum chemical study of benzimidazole derivatives to tune the second-order nonlinear optical molecular switching by proton abstraction" @default.
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• W1986972693 doi "https://doi.org/10.1039/b924241d" @default.
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