Solvation and hydrogen bonding aided efficient non-radiative deactivation of polar excited state of 5-aminoquinoline

2018 ◽  
Vol 20 (34) ◽  
pp. 22320-22330 ◽  
Author(s):  
Avinash Kumar Singh ◽  
Sharmistha Das ◽  
Abhoy Karmakar ◽  
Anuj Kumar ◽  
Anindya Datta
Keyword(s):  
Hydrogen Bonding ◽  
Excited State ◽  
Fluorescence Quenching

The mechanism of efficient fluorescence quenching of 5-aminoquinoline in alcoholic solvents.

An acidity scale, [H+]hv, for proton quenching of excited states

1989 ◽  
Vol 67 (2) ◽  
pp. 227-238 ◽  
Author(s):  
J. A. Pincock ◽  
P. R. Redden
Keyword(s):  
Excited State ◽  
Fluorescence Quenching ◽  
Excited States ◽  
Benzyl Alcohols ◽  
Fluorescent Indicator ◽  
Quenching Of Fluorescence ◽  
Acidity Scale

An acidity scale for excited state protonation kinetics in 20% ethanol:80% aqueous sulfuric has been developed using 1-cyano-naphthalene as a fluorescent indicator. The utility of this new scale is demonstrated using the proton quenching of fluorescence of a variety of chromophores. These include 1- and 2-cyanonaphthalenes, 1- and 2-methoxynaphthalenes, benzyl alcohols, toluenes, and 2-vinylnaphthalene. Keywords: acidity scale, fluorescence quenching, excited state basicity.

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