Donor-Acceptor Fluorescent Molecular Rotors Appended with Benzocrown Ethers as Doubly Twisted Intramolecular Charge Transfer Based Ratiometric Acidic pH Sensors

2015 ◽  
Vol 5 (2) ◽  
pp. 187-191 ◽  
Author(s):  
Shahida Umar ◽  
Ajay Kumar Jha ◽  
Atul Goel
Keyword(s):  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Molecular Rotors ◽  
Acidic Ph ◽  
Ph Sensors ◽  
Twisted Intramolecular Charge Transfer ◽  
Benzocrown Ethers ◽  
Fluorescent Molecular Rotors ◽  
Donor Acceptor

Effect of Substituents on TICT Rate in Thioflavin T-Based Fluorescent Molecular Rotors

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940046
Author(s):  
V. I. Stsiapura ◽  
S. D. Gogoleva ◽  
A. A. Maskevich ◽  
O. V. Buganov ◽  
S. A. Tikhomirov ◽  
...  
Keyword(s):  
Excited States ◽  
Intramolecular Charge Transfer ◽  
Thioflavin T ◽  
Molecular Rotors ◽  
Molecular Fragments ◽  
Time Resolved ◽  
Fluorescent Molecular Rotors ◽  
Methoxy Groups ◽  
Donor Acceptor ◽  
Mutual Rotation

New fluorescent molecular rotors (FMRs) were developed by modification of the Thioflavin T (ThT) structure via introduction of methyl and methoxy groups. Effects of the substituents on fluorescence properties and twisted intramolecular charge transfer (TICT) rate in the excited state of the molecules were studied using steady-state fluorescence and time-resolved absorption spectroscopy. Quantum chemical calculations of the molecules in the ground and excited states were carried out to aid interpretation of the experimental results. Only cationic forms of ThT derivatives have FMR properties and exhibit viscosity-dependent fluorescence. The TICT rate was found to be affected by the size of the molecular fragments, which experience mutual rotation, dihedral angle [Formula: see text] between the fragments in the ground state as well as their donor/acceptor properties.

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.

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