Novel Photoreactions of 2-Aza-1,4-dienes in the Triplet Excited State and via Radical-Cation Intermediates. 2-Aza-di-π-methane Rearrangements Yielding Cyclopropylimines andN-Vinylaziridines

2003 ◽  
Vol 68 (17) ◽  
pp. 6661-6671 ◽  
Author(s):  
Diego Armesto ◽  
Olga Caballero ◽  
Maria J. Ortiz ◽  
Antonia R. Agarrabeitia ◽  
Mar Martin-Fontecha ◽  
...  
Keyword(s):  
Excited State ◽  
Radical Cation ◽  
Triplet Excited State

Characterization of the triplet excited state of the phenylxanthenium carbocation

1992 ◽  
Vol 70 (1) ◽  
pp. 280-282 ◽  
Author(s):  
L. J. Johnston ◽  
D. F. Wong
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Radical Cation ◽  
Transient Absorption ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Triplet Excited State ◽  
Triplet Absorption

The triplet excited state of the 9-phenylxanthenium cation has been observed directly by both luminescence and transient absorption techniques. The triplet–triplet absorption shows λmax ≤ 300 nm and decays over a period of several microseconds in the absence of easily oxidized donors. The triplet cation reacts with 9-phenylxanthydrol and biphenyl via electron transfer to give the corresponding radical and radical cation and also reacts rapidly with both oxygen and 1,3-cyclohexadiene. Keywords: carbocations, triplets, electron transfer, laser flash photolysis.

scholarly journals Ultra long‐lived triplet excited state in water at room temperature: Insights on the molecular design of tridecafullerenes

2021 ◽  
Author(s):  
Javier Ramos-Soriano ◽  
Alfonso Pérez-Sánchez ◽  
Sergio Ramírez-Barroso ◽  
Beatriz M. Illescas ◽  
Khalid Azmani ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Molecular Design ◽  
Triplet Excited State

scholarly journals Triplet energies and excimer formation in meta - and para -linked carbazolebiphenyl matrix materials

2015 ◽  
Vol 373 (2044) ◽  
pp. 20140446 ◽  
Author(s):  
Sergey A. Bagnich ◽  
Alexander Rudnick ◽  
Pamela Schroegel ◽  
Peter Strohriegl ◽  
Anna Köhler
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Spectroscopic Investigation ◽  
Triplet Excited State ◽  
Conjugation Length ◽  
Triplet Energy ◽  
Excimer Formation

We present a spectroscopic investigation on the effect of changing the position where carbazole is attached to biphenyl in carbazolebiphenyl (CBP) on the triplet state energies and the propensity to excimer formation. For this, two CBP derivatives have been prepared with the carbazole moieties attached at the ( para ) 4- and 4 ′ -positions ( p CBP) and at the ( meta ) 3- and 3 ′ -positions ( m CBP) of the biphenyls. These compounds are compared to analogous m CDBP and p CDBP, i.e. two highly twisted carbazoledimethylbiphenyls, which have a high triplet energy at about 3.0 eV and tend to form triplet excimers in a neat film. This torsion in the structure is associated with localization of the excited state onto the carbazole moieties. We find that in m CBP and p CBP, excimer formation is prevented by localization of the triplet excited state onto the central moiety. As conjugation can continue from the central biphenyls into the nitrogen of the carbazole in the para -connected p CBP, emission involves mainly the benzidine. By contrast, the meta -linkage in m CBP limits conjugation to the central biphenyl. The associated shorter conjugation length is the reason for the higher triplet energy of 2.8 eV in m CBP compared with the 2.65 eV in p CBP.

Electron transfer from guanosine to the lowest triplet excited state of 4-nitroindole through hydrogen-bonded complex

2021 ◽  
Vol 408 ◽  
pp. 113106
Author(s):  
Zhao Ye ◽  
Yong Du ◽  
Xinghang Pan ◽  
Xuming Zheng ◽  
Jiadan Xue
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Triplet Excited State ◽  
Hydrogen Bonded

Investigation of the triplet excited state and application of cationic meso-tetra(cisplatin)porphyrins in antimicrobial photodynamic therapy

2021 ◽  
pp. 102459
Author(s):  
Dariane Clerici Jornada ◽  
Rafael de Queiroz Garcia ◽  
Carolina Hahn da Silveira ◽  
Lino Misoguti ◽  
Cleber Renato Mendonça ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Excited State ◽  
Antimicrobial Photodynamic Therapy ◽  
Triplet Excited State

A photochemical study of the triplet excited state of pyrene-4,5-dione and pyrene-4,5,9,10-tetrone derivatives

2020 ◽  
Vol 401 ◽  
pp. 112777
Author(s):  
Rodolfo I. Teixeira ◽  
Simon J. Garden ◽  
Nanci C. de Lucas
Keyword(s):  
Excited State ◽  
Triplet Excited State

Ground- and Triplet Excited-State Properties Correlation: A Computational CASSCF/CASPT2 Approach Based on the Photodissociation of Allylsilanes

2012 ◽  
Vol 116 (5) ◽  
pp. 1425-1434 ◽  
Author(s):  
Panayiotis C. Varras ◽  
Antonios K. Zarkadis
Keyword(s):  
Excited State ◽  
Triplet Excited State

scholarly journals Electron Transfer Initiated Reactions Photoinduced by Pterins

Pteridines ◽  
2011 ◽  
Vol 22 (1) ◽  
pp. 111-119 ◽  
Author(s):  
Carolina Lorente ◽  
Gabriela Petroselli ◽  
M. Laura Dántola ◽  
Esther Oliveros ◽  
Andrés H. Thomas
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Redox Reactions ◽  
Type I ◽  
Biological Processes ◽  
Type Ii ◽  
Triplet Excited State ◽  
Oxygen Production ◽  
Production Type ◽  
Transfer Mechanisms

Abstract Interest in the photochemistry and photophysics of pterins has increased since the participation of this family of compounds in different photobiological processes has been suggested or demonstrated in recent decades. Pterins participate in relevant biological processes, such as metabolic redox reactions, and can photoinduce the oxidation of biomolecules through both electron transfer mechanisms (Type I) and singlet oxygen production (Type II). This article describes recent findings on electron transfer-initiated reactions photoinduced by the triplet excited state of pterins and connects them in the context of photosensitized processes of biological relevance.

scholarly journals Singlet and Triplet Excited-State Dynamics Study of the Keto and Enol Tautomers of Cytosine

ChemPhysChem ◽  
2013 ◽  
Vol 14 (13) ◽  
pp. 2920-2931 ◽  
Author(s):  
Sebastian Mai ◽  
Philipp Marquetand ◽  
Martin Richter ◽  
Jesús González-Vázquez ◽  
Leticia González
Keyword(s):  
Excited State ◽  
Triplet Excited State ◽  
Excited State Dynamics

Triplet Excited State Behavior of Naphthalene-Based Pseudopeptides in the Presence of Energy Donors

2012 ◽  
Vol 116 (33) ◽  
pp. 9957-9962 ◽  
Author(s):  
Paula Bonancía ◽  
Laura Vigara ◽  
Francisco Galindo ◽  
Santiago V. Luis ◽  
M. Consuelo Jiménez ◽  
...  
Keyword(s):  
Excited State ◽  
Triplet Excited State ◽  
State Behavior
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