Molecular Mechanism of the Intermolecular Hydrogen Bond between 2-Piperidinoanthraquinone and Alcohol in the Excited State:  Direct Observation of the Out-of-Plane Mode Interaction with Alcohol by Transient Absorption Studies

2001 ◽  
Vol 105 (39) ◽  
pp. 8840-8849 ◽  
Author(s):  
Akimitsu Morimoto ◽  
Tomoyuki Yatsuhashi ◽  
Tetsuya Shimada ◽  
Shigeichi Kumazaki ◽  
Keitarou Yoshihara ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Excited State ◽  
Molecular Mechanism ◽  
Direct Observation ◽  
Transient Absorption ◽  
Intermolecular Hydrogen Bond ◽  
Mode Interaction ◽  
Absorption Studies ◽  
Out Of Plane ◽  
Plane Mode

Transient absorption studies of the Ru(dcbpy)2(NCS)2 excited state and the dye cation on nanocrystalline TiO2 film

2001 ◽  
Vol 340 (3-4) ◽  
pp. 217-221 ◽  
Author(s):  
Jani Kallioinen ◽  
Viivi Lehtovuori ◽  
Pasi Myllyperkiö ◽  
Jouko Korppi-Tommola
Keyword(s):  
Excited State ◽  
Tio2 Film ◽  
Transient Absorption ◽  
Nanocrystalline Tio2 ◽  
Absorption Studies

Excited state electron transfer in A2 and A2B2 functionalized zinc porphyrins carrying rigid and flexible β-pyrrole π-extended substituents

2020 ◽  
Vol 24 (05n07) ◽  
pp. 904-919
Author(s):  
Michael B. Thomas ◽  
Siddhartha Kumar ◽  
Timothy Esquivel ◽  
Hong Wang ◽  
Francis D’Souza
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Transient Absorption ◽  
Binding Constants ◽  
Free Energy Calculations ◽  
Stable Complex ◽  
State Electron ◽  
Femtosecond Transient Absorption ◽  
Absorption Studies ◽  
Zinc Porphyrins

Optical absorption and emission, electrochemical, and photochemical properties of peripherally functionalized with flexible and rigid [Formula: see text]-extended substituents on A2 and A2B2 type zinc porphyrins is investigated. The significance of rigid [Formula: see text]-substituents over flexible ones in governing the spectral properties is unraveled. Flexible [Formula: see text]-substituents on the porphyrin ring caused appreciable spectral broadening compared to porphyrin carrying rigid [Formula: see text]-substituents. Further, supramolecular dyads are formed by coordinating phenyl imidazole functionalized fullerene, C[Formula: see text]Im. The calculated binding constants for the 1:1 complexes is in the order of 2–7 × 105 M[Formula: see text] suggesting stable complex formation. Free-energy calculations performed according to the Rehm–Weller approach suggested possibility of excited state electron transfer in these dyads. Femtosecond transient absorption studies of the dyads performed in [Formula: see text]-dichlorobenzene showed evidence of occurrence of electron transfer from the singlet-excited state that was in competition with the intersystem crossing process to populate the triplet-excited state of porphyrins.

scholarly journals Excited-state intramolecular proton transfer in a bioactive flavonoid provides fluorescence observables for recognizing its engagement with target proteins

2019 ◽  
Vol 18 (9) ◽  
pp. 2270-2280 ◽  
Author(s):  
Davide Vanossi ◽  
Monica Caselli ◽  
Giorgia Pavesi ◽  
Chiara Borsari ◽  
Pasquale Linciano ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Excited State ◽  
Proton Transfer ◽  
Bond Formation ◽  
Intermolecular Hydrogen Bond ◽  
Intramolecular Proton Transfer ◽  
Hydrogen Bond Formation ◽  
Target Proteins ◽  
Emission Properties

Intra- vs. intermolecular hydrogen-bond formation and ESIPT in a bioactive flavonoid result in different emission properties and provide a clue for recognizing its binding to target proteins.

The excited-state multiple proton transfer mechanism of the 7-hydroxyquinoline–(CH3OH)3cluster

2015 ◽  
Vol 39 (12) ◽  
pp. 9910-9917 ◽  
Author(s):  
Yanling Cui ◽  
Hong Zhao ◽  
Jinfeng Zhao ◽  
Pengyu Li ◽  
Peng Song ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Excited State ◽  
Proton Transfer ◽  
Intermolecular Hydrogen Bond ◽  
Transfer Mechanism ◽  
Excited State Proton Transfer

Two proposed competitive types of multiple excited-state proton transfer take place along the intermolecular hydrogen-bond for 7-hydroxyquinoline–(CH3OH)3.

Lycopene crystalloids exhibit singlet exciton fission in tomatoes

2018 ◽  
Vol 20 (13) ◽  
pp. 8640-8646 ◽  
Author(s):  
M. J. Llansola-Portoles ◽  
K. Redeckas ◽  
S. Streckaité ◽  
C. Ilioaia ◽  
A. A. Pascal ◽  
...  
Keyword(s):  
Excited State ◽  
Transient Absorption ◽  
Singlet Exciton ◽  
Absorption Studies ◽  
Singlet Exciton Fission

Transient absorption studies conducted on in vitro lycopene aggregates, as well as on lycopene crystalloids inside tomato chromoplasts, reveal the appearance of a long-lived excited state, which we unambiguously identified as lycopene triplet generated by singlet exciton fission.

Ultrafast Intermolecular Hydrogen Bond Dynamics in the Excited State of Fluorenone

2005 ◽  
Vol 109 (39) ◽  
pp. 8693-8704 ◽  
Author(s):  
Vaishali Samant ◽  
Ajay K. Singh ◽  
G. Ramakrishna ◽  
Hirendra N. Ghosh ◽  
Tapan K. Ghanty ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Excited State ◽  
Intermolecular Hydrogen Bond ◽  
Hydrogen Bond Dynamics
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