scholarly journals Vibrational Spectroscopy Reveals Effects of Electron Push–Pull and Solvent Polarity on Electron Delocalization in Radical Anions of Donor–Acceptor Compounds

2020 ◽  
Vol 124 (8) ◽  
pp. 1543-1549 ◽  
Author(s):  
Andrew M. Boudreau ◽  
Reid W. Wilson ◽  
Mengshijie Yang ◽  
David C. Grills ◽  
Tomoyasu Mani
Keyword(s):  
Vibrational Spectroscopy ◽  
Solvent Polarity ◽  
Electron Delocalization ◽  
Radical Anions ◽  
Donor Acceptor

Increased Charge Separation Rates with Increasing Donor–Acceptor Distance in Molecular Triads: The Effect of Solvent Polarity

2017 ◽  
Vol 121 (17) ◽  
pp. 9220-9229 ◽  
Author(s):  
Yusen Luo ◽  
Kevin Barthelmes ◽  
Maria Wächtler ◽  
Andreas Winter ◽  
Ulrich S. Schubert ◽  
...  
Keyword(s):  
Charge Separation ◽  
Solvent Polarity ◽  
Effect Of Solvent ◽  
Donor Acceptor

scholarly journals Three Redox States of a Diradical Acceptor–Donor–Acceptor Triad: Gating the Magnetic Coupling and the Electron Delocalization

2016 ◽  
Vol 7 (12) ◽  
pp. 2234-2239 ◽  
Author(s):  
Manuel Souto ◽  
Vega Lloveras ◽  
Sergi Vela ◽  
Maria Fumanal ◽  
Imma Ratera ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Electron Delocalization ◽  
Redox States ◽  
Donor Acceptor

scholarly journals An Intelligent AIEgen with Nonmonotonic Multi-Responses to Multi-Stimuli

2020 ◽  
Author(s):  
Yujie Tu ◽  
Yeqing Yu ◽  
Diwen Xiao ◽  
Junkai Liu ◽  
zheng zhao ◽  
...  
Keyword(s):  
Rational Design ◽  
Gas Sensing ◽  
Solvent Polarity ◽  
Design Strategy ◽  
Ph Sensing ◽  
Light Emitting ◽  
Stimulus Response ◽  
Donor Acceptor ◽  
Ratiometric Ph Sensing ◽  
Anti Stokes

<p>Intelligent stimulus-response (S/R) systems are the basis of natural process and machine control, and have been intensively explored in biomimetic design, analytical chemistry and biological applications. However, nonmonotonic multi-S/R systems are still rarely studied so far. Now, we propose a rational design strategy to achieve such a unique S/R system by integrating opposite luminescence behaviors in one molecule. When solvent polarity increases, many heterocycles often become more emissive due to the suppression of the proximity effect. However, molecules with donor-acceptor (D-A) structures tend to be less emissive because of the twisted intramolecular charge transfer. Meanwhile, protonation on D/A moieties will weaken/strengthen the D-A interaction to result in blue/red-shifted emissions. By combining a protonatable heterocyclic acceptor and a protonatable donor together in one molecule, we can easily achieve nonmonotonic brightness responses to polarity stimuli and nonmonotonic color responses to pH stimuli. In this work, a simple molecule, namely ASQ is chosen as the model compound to verify the design strategy feasibility. It successfully shows two opposite trends of responses to polarity and pH stimuli, and aggregation-induced emission (AIE) with a nonmonotonic AIE curve. Moreover, the acidified ASQ solution is also a pure organic up-conversion and white-light-emitting system. A new mechanistic viewpoint is established to explain its unique anti-Stokes emission. Besides, ASQ shows multivalent functionalities including albumin protein sensing, ratiometric pH sensing, and amine gas sensing, etc. Therefore, ASQ is proved to be a fundamentally important and versatile functional “intelligent” AIE luminogen with nonmonotonic multi-responses to multi-stimuli. <br></p>

scholarly journals Electronic and vibrational spectroscopy studies of PffBT4T π-conjugated donor–acceptor copolymer

2018 ◽  
Vol 8 (03) ◽  
pp. 1 ◽  
Author(s):  
Shai R. Vardeny ◽  
Sangita Baniya ◽  
Evan Lafalce ◽  
Nasser Peyghambarian ◽  
Z. Valy Vardeny
Keyword(s):  
Vibrational Spectroscopy ◽  
Donor Acceptor ◽  
Spectroscopy Studies
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