Donor–acceptor preassociation, excited state solvation threshold, and optical energy cost as challenges in chemical applications of photobases

2019 ◽  
Vol 216 ◽  
pp. 252-268 ◽  
Author(s):  
Jonathan Ryan Hunt ◽  
Cindy Tseng ◽  
Jahan M. Dawlaty
Keyword(s):  
Hydrogen Bonding ◽  
Excited State ◽  
Photon Energy ◽  
Energy Cost ◽  
Light Energy ◽  
Optical Energy ◽  
Donor Acceptor

Photobases convert light energy to proton removal power. What limits their applicability? Hydrogen bonding, solvation, and photon energy cost.

Effects of intramolecular hydrogen bonding and sterically forced non-coplanarity on organic donor/acceptor two-photon-absorbing molecules

2018 ◽  
Vol 20 (29) ◽  
pp. 19398-19407 ◽  
Author(s):  
David J. Stewart ◽  
Ramamurthi Kannan ◽  
Tod A. Grusenmeyer ◽  
Jacob M. Artz ◽  
Stephanie L. Long ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Excited State ◽  
Decay Rate ◽  
Rate Constant ◽  
Intramolecular Hydrogen Bonding ◽  
Decay Rate Constant ◽  
Two Photon ◽  
State Decay ◽  
Donor Acceptor ◽  
Intramolecular Hydrogen

Excited-state decay rate constant is controlled by hydrogen bonding, which is switched from intramolecular to intermolecular by choice of solvent.

scholarly journals Thermochromic aggregation-induced dual phosphorescence via temperature-dependent sp3-linked donor-acceptor electronic coupling

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Wang ◽  
Zhubin Hu ◽  
Xiancheng Nie ◽  
Linkun Huang ◽  
Miao Hui ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Electronic Coupling ◽  
Temperature Dependent ◽  
Molecular Systems ◽  
Donor And Acceptor ◽  
Theoretical Investigations ◽  
Donor Acceptor ◽  
And Control ◽  
Two Temperature

AbstractAggregation-induced emission (AIE) has proven to be a viable strategy to achieve highly efficient room temperature phosphorescence (RTP) in bulk by restricting molecular motions. Here, we show that by utilizing triphenylamine (TPA) as an electronic donor that connects to an acceptor via an sp3 linker, six TPA-based AIE-active RTP luminophores were obtained. Distinct dual phosphorescence bands emitting from largely localized donor and acceptor triplet emitting states could be recorded at lowered temperatures; at room temperature, only a merged RTP band is present. Theoretical investigations reveal that the two temperature-dependent phosphorescence bands both originate from local/global minima from the lowest triplet excited state (T1). The reported molecular construct serves as an intermediary case between a fully conjugated donor-acceptor system and a donor/acceptor binary mix, which may provide important clues on the design and control of high-freedom molecular systems with complex excited-state dynamics.

scholarly journals Charge separation in the excited state electron donor—acceptor compounds containing the piperazine moiety

1991 ◽  
Vol 180 (6) ◽  
pp. 556-562 ◽  
Author(s):  
A.M. Brouwer ◽  
R.D. Mout ◽  
P.H.Maassen van den Brink ◽  
H.J. van Ramesdonk ◽  
J.W. Verhoeven ◽  
...  
Keyword(s):  
Excited State ◽  
Electron Donor ◽  
Charge Separation ◽  
State Electron ◽  
Donor Acceptor
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