Unusual twisted intramolecular charge transfer processes of 4,4‘-diamino-diphenylsulfone in β-cyclodextrin: a study by electronic spectra

2006 ◽  
Vol 2006 (8) ◽  
pp. 523-526 ◽  
Author(s):  
◽  
Meenakshisundaram Swaminathan
Keyword(s):  
Charge Transfer ◽  
Electronic Spectra ◽  
Intramolecular Charge Transfer ◽  
Twisted Intramolecular Charge Transfer ◽  
Transfer Processes

Effect of bulky meso-substituents on photoinduced twisted intramolecular charge transfer processes in meso-diarylamino subporphyrins

2016 ◽  
Vol 20 (06) ◽  
pp. 663-669 ◽  
Author(s):  
Seung-Kyu Lee ◽  
Jun Oh Kim ◽  
Daiki Shimizu ◽  
Atsuhiro Osuka ◽  
Dongho Kim
Keyword(s):  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Solvent Polarity ◽  
Intramolecular Electron Transfer ◽  
Separation Processes ◽  
Time Resolved ◽  
Twisted Intramolecular Charge Transfer ◽  
Transfer Processes ◽  
Steady State Time ◽  
Photoexcited State

Photoexcited-state dynamics of meso-diarylamino subporphyrins 4–6 in cyclohexane, toluene, and acetonitrile have been studied by steady-state/time-resolved absorption and fluorescence experiments and quantum calculations. While 4 emits fluorescence from the locally excited state regardless of solvent polarity, the fluorescence of 5 and 6 are solvent-polarity dependent. The observed efficient fluorescent quenching of 5 and 6 has been ascribed to twisted intramolecular charge transfer (TICT), in which the two N–C[Formula: see text] bonds in 5 and the C[Formula: see text]–N bond in 6 are twisted to facilitate the intramolecular electron transfer. In 2-methyltetrahydrofuran (2-MeTHF), the fluorescence of 5 and 6 are both almost completely quenched at 297 K, but restored at 77 K (below the melting point of 2-MeTHF) because of the frozen molecular twisting. Furthermore, electrochemical studies also revealed the charge separation processes of 4–6 are thermally unfavorable in nonpolar toluene and cyclohexane unless their structures change contrary to the observed efficient fluorescence quenching. These observations support the TICT mechanism. In addition, the formation of TICT state is affected by steric effect as the size of the meso-substituents increases.

Dynamic adjustment of emission from both singlets and triplets: the role of excited state conformation relaxation and charge transfer in phenothiazine derivates

2021 ◽  
Author(s):  
Weidong Qiu ◽  
Xinyi Cai ◽  
Mengke Li ◽  
Liangying Wang ◽  
Yanmei He ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Dynamic Adjustment ◽  
Twisted Intramolecular Charge Transfer

Dynamic adjustment of emission behaviours by controlling the extent of twisted intramolecular charge transfer character in excited state.

A Proton-Triggered ON−OFF−ON Fluorescent Chemosensor for Mg(II) via Twisted Intramolecular Charge Transfer

2008 ◽  
Vol 10 (13) ◽  
pp. 2873-2876 ◽  
Author(s):  
Yu Liu ◽  
Min Han ◽  
Heng-Yi Zhang ◽  
Li-Xu Yang ◽  
Wei Jiang
Keyword(s):  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Fluorescent Chemosensor ◽  
Twisted Intramolecular Charge Transfer

Interaction of Twisted Intramolecular Charge-Transfer Probe Loaded Silver Nanoparticles with the Hydrophobic Nanocavities of Cyclodextrins

2010 ◽  
Vol 114 (46) ◽  
pp. 19635-19640 ◽  
Author(s):  
Tarasankar Das ◽  
Abhishek Kumar ◽  
Prasun Ghosh ◽  
Arnab Maity ◽  
Syed S. Jaffer ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Twisted Intramolecular Charge Transfer
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