Aromatic nitration with ion radical pairs [ArH.cntdot.+,NO2.cntdot.] as reactive intermediates. Time-resolved studies of charge-transfer activation of dialkoxybenzenes

1987 ◽  
Vol 109 (17) ◽  
pp. 5235-5249 ◽  
Author(s):  
S. Sankararaman ◽  
W. A. Haney ◽  
Jay K. Kochi
Keyword(s):  
Charge Transfer ◽  
Reactive Intermediates ◽  
Radical Pairs ◽  
Time Resolved ◽  
Aromatic Nitration

scholarly journals Synthesis and Photobehavior of a NewDehydrobenzoannulene-Based HOF with Fluorine Atoms: From Solution to Single Crystals Observation

2021 ◽  
Vol 22 (9) ◽  
pp. 4803
Author(s):  
Eduardo Gomez ◽  
Ichiro Hisaki ◽  
Abderrazzak Douhal
Keyword(s):  
Charge Transfer ◽  
Single Crystals ◽  
Parent Compound ◽  
Time Resolved ◽  
Strong Basis ◽  
Triplet Structure ◽  
Carboxylic Groups ◽  
Potential Applications ◽  
A Charge ◽  
Further Development

Hydrogen-bonded organic frameworks (HOFs) are the focus of intense scientific research due their potential applications in science and technology. Here, we report on the synthesis, characterization, and photobehavior of a new HOF (T12F-1(124TCB)) based on a dehydrobenzoannulene derivative containing fluorine atoms (T12F-COOH). This HOF exhibits a 2D porous sheet, which is hexagonally networked via H-bonds between the carboxylic groups, and has an interlayers distance (4.3 Å) that is longer than that of a typical π–π interaction. The presence of the fluorine atoms in the DBA molecular units largely increases the emission quantum yield in DMF (0.33, T12F-COOH) when compared to the parent compound (0.02, T12-COOH). The time-resolved dynamics of T12F-COOH in DMF is governed by the emission from a locally excited state (S1, ~ 0.4 ns), a charge-transfer state (S1(CT), ~ 2 ns), and a room temperature emissive triplet state (T1, ~ 20 ns), in addition to a non-emissive triplet structure with a charge-transfer character (T1(CT), τ = 0.75 µs). We also report on the results using T12F-ester. Interestingly, FLIM experiments on single crystals unravel that the emission lifetimes of the crystalline HOF are almost twice those of the amorphous ones or the solid T12F-ester sample. This shows the relevance of the H-bonds in the photodynamics of the HOF and provides a strong basis for further development and study of HOFs based on DBAs for potential applications in photonics.

scholarly journals Horizontal versus vertical charge and energy transfer in hybrid assemblies of semiconductor nanoparticles

2012 ◽  
Vol 3 ◽  
pp. 629-636 ◽  
Author(s):  
Gilad Gotesman ◽  
Rahamim Guliamov ◽  
Ron Naaman
Keyword(s):  
Energy Transfer ◽  
Charge Transfer ◽  
Horizontal Plane ◽  
Quartz Substrate ◽  
Vertical Direction ◽  
Time Resolved ◽  
Transfer Processes ◽  
Donor And Acceptor ◽  
Hybrid Assemblies ◽  
Time Resolved Photoluminescence

We studied the photoluminescence and time-resolved photoluminescence from self-assembled bilayers of donor and acceptor nanoparticles (NPs) adsorbed on a quartz substrate through organic linkers. Charge and energy transfer processes within the assemblies were investigated as a function of the length of the dithiolated linker (DT) between the donors and acceptors. We found an unusual linker-length-dependency in the emission of the donors. This dependency may be explained by charge and energy transfer processes in the vertical direction (from the donors to the acceptors) that depend strongly on charge transfer processes occurring in the horizontal plane (within the monolayer of the acceptor), namely, parallel to the substrate.

Ion—molecular charge transfer as studied by the method of optically detected ESR of radical pairs

1984 ◽  
Vol 84 (3) ◽  
pp. 421-430 ◽  
Author(s):  
V.O. Saik ◽  
N.N. Lukzen ◽  
V.M. Grigoryants ◽  
O.A. Anisimov ◽  
A.B. Doktorov ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Radical Pairs ◽  
Molecular Charge ◽  
Optically Detected

Mechanism of charge transfer in the molecular DPQ complex studied by time-resolved fluorescence spectroscopy

1991 ◽  
Vol 95 (17) ◽  
pp. 6437-6440 ◽  
Author(s):  
V. V. Borovkov ◽  
R. P. Evstigneeva ◽  
I. A. Struganova ◽  
V. F. Kamalov ◽  
B. N. Toleutaev
Keyword(s):  
Charge Transfer ◽  
Fluorescence Spectroscopy ◽  
Time Resolved Fluorescence ◽  
Time Resolved
Sign in / Sign up

Export Citation Format

Share Document