Observation of Proton-Coupled Electron Transfer by Transient Absorption Spectroscopy in a Hydrogen-Bonded, Porphyrin Donor−Acceptor Assembly

2004 ◽  
Vol 108 (20) ◽  
pp. 6315-6321 ◽  
Author(s):  
Niels H. Damrauer ◽  
Justin M. Hodgkiss ◽  
Joel Rosenthal ◽  
Daniel G. Nocera
Keyword(s):  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Proton Coupled Electron Transfer ◽  
Donor Acceptor ◽  
Hydrogen Bonded

Transient Absorption Spectroscopy of the Electron Transfer Step in the Photochemically Activated Polymerizations of N-ethylcarbazole and 9-phenylcarbazole.

2021 ◽  
Author(s):  
Georgia Thornton ◽  
Ryan Phelps ◽  
Andrew Orr-Ewing
Keyword(s):  
Electron Transfer ◽  
Radical Cation ◽  
Absorption Spectroscopy ◽  
Electron Acceptor ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Transfer Step

The polymerization of photoexcited N-ethylcarbazole (N-EC) in the presence of an electron acceptor begins with an electron transfer (ET) step to generate a radical cation of N-EC (N-EC+.). Here, the...

scholarly journals Interaction of light with a non-covalent zinc porphyrin–graphene oxide nanohybrid

2020 ◽  
Vol 22 (24) ◽  
pp. 13456-13466
Author(s):  
Ewelina Gacka ◽  
Gotard Burdzinski ◽  
Bronisław Marciniak ◽  
Adam Kubas ◽  
Anna Lewandowska-Andralojc
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Absorption Spectroscopy ◽  
Fast Electron ◽  
Transient Absorption ◽  
Singlet State ◽  
Transient Absorption Spectroscopy ◽  
Time Resolved ◽  
Zinc Porphyrin

Fast electron transfer from the photoexcited ZnTPPH singlet state to GO sheets was detected by ultrafast time-resolved transient absorption spectroscopy.

Donor-acceptor conjugates derived from cobalt porphyrin and fullerene via metal-ligand axial coordination: Formation and excited state charge separation

2021 ◽  
pp. A-N
Author(s):  
Dili R. Subedi ◽  
Youngwoo Jang ◽  
Ashwin Ganesan ◽  
Sydney Schoellhorn ◽  
Ryan Reid ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Charge Separation ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Cobalt Porphyrin ◽  
Axial Coordination ◽  
Cobalt Porphyrins ◽  
Donor Acceptor ◽  
Metal Ligand

Two types of cobalt porphyrins, viz., meso-tetrakis(tolylporphyrinato)cobalt(II), (TTP)Co (1), and meso-tetrakis(triphenylamino porphyrinato)cobalt(II), [(TPA)4P]Co, (2) were self-assembled via metal-ligand axial coordination of phenyl imidazole functionalized fulleropyrrolidine, ImC[Formula: see text] to form a new series of donor–acceptor constructs. A 1:2 complex formation with ImC[Formula: see text] was established in the case of (TTP)Co while for [(TPA)4P]Co only a 1:1 complex was possible to positively identify. The binding constants [Formula: see text] and [Formula: see text] for step-wise addition of ImC[Formula: see text] to (TTP)Co were found to be 1.07 × 105 and 3.20 × 104 M[Formula: see text], respectively. For [(TPA)4P]Co:ImC[Formula: see text], the measured [Formula: see text] values was found to be 6.48 × 104 M[Formula: see text], slightly smaller than that observed for (TTP)Co. Although both cobalt porphyrins were non-fluorescent, they were able to quench the fluorescence of ImC[Formula: see text] indicating occurrence of excited state events in the supramolecular donor-acceptor complexes. Electrochemistry coupled with spectroelectrochemistry, revealed the formation of cobalt(III) porphyrin cation instead of a cobalt(II) porphyrin radical cation, as the main product, during oxidation of phenyl imidazole coordinated cobalt porphyrin. With the help of computational and electrochemical results, an energy level diagram was constructed to witness excited state photo-events. Competitive energy and electron transfer from excited CoP to coordinated ImC[Formula: see text], and electron transfer from Im1C[Formula: see text]* to cobalt(II) porphyrin resulting into the formation of PCo[Formula: see text]:ImC[Formula: see text] charge separated state was possible to envision from the energy diagram. Finally, using femtosecond transient absorption spectroscopy and data analysis by Glotaran, it was possible to establish sequential occurrence of energy transfer and charge separation processes. The lifetime of the final charge separated state was [Formula: see text] 2 ns. A slightly better charge stabilization was observed in the case of [(TPA)4P]Co:ImC[Formula: see text] due to the presence of electron rich, peripheral triphenylamine substituents on the cobalt porphyrin.

Photoexcitation dynamics of p-nitroaniline and N,N-dimethyl-p-nitroaniline in 1-alkyl-3-methylimidazolium-cation based ionic liquids with different alkyl-chain lengths

2017 ◽  
Vol 19 (33) ◽  
pp. 22161-22168 ◽  
Author(s):  
Y. Kimura ◽  
S. Ibaraki ◽  
R. Hirano ◽  
Y. Sugita ◽  
Y. Yasaka ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Ionic Liquids ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Vibrational Energy ◽  
Alkyl Chain ◽  
Transient Absorption Spectroscopy ◽  
Vibrational Energy Relaxation ◽  
Back Electron Transfer ◽  
Chain Lengths

Back electron transfer and vibrational energy relaxation of p-nitroaniline and N,N-dimethyl-p-nitroaniline in ionic liquids were investigated using transient absorption spectroscopy.

Roles of adsorption sites in electron transfer from CdS quantum dots to molecular catalyst cobaloxime studied by time-resolved spectroscopy

2016 ◽  
Vol 18 (26) ◽  
pp. 17389-17397 ◽  
Author(s):  
Yun Ye ◽  
Yuxing Xu ◽  
Lei Huang ◽  
Dayong Fan ◽  
Zhaochi Feng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Cds Quantum Dots ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Molecular Catalyst ◽  
Adsorption Sites

Electron transfer from CdS quantum dots (QDs) to cobaloxime (Co(dmgH)2pyCl) is demonstrated by transient absorption spectroscopy (TAS), and further confirmed using photoluminescence (PL) techniques.

Cascading electron and hole transfer dynamics in a CdS/CdTe core–shell sensitized with bromo-pyrogallol red (Br-PGR): slow charge recombination in type II regime

Nanoscale ◽  
2015 ◽  
Vol 7 (6) ◽  
pp. 2698-2707 ◽  
Author(s):  
Partha Maity ◽  
Tushar Debnath ◽  
Uday Chopra ◽  
Hirendra Nath Ghosh
Keyword(s):  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Charge Recombination ◽  
Transient Absorption Spectroscopy ◽  
Core Shell ◽  
Type Ii ◽  
Pyrogallol Red ◽  
First Time ◽  
Cdte Core

For the first time ultrafast cascading hole and electron transfer dynamics in a CdS/CdTe type II core–shell sensitized with a molecular adsorbate (Br-PGR) have been demonstrated using transient absorption spectroscopy.

Sign in / Sign up

Export Citation Format

Share Document