Effects of protolytic interactions on the photophysics of phenyl pyridyl ketones

1994 ◽  
Vol 90 (2) ◽  
pp. 279 ◽  
Author(s):  
Fausto Elisei ◽  
Gianna Favaro ◽  
Fausto Ortica
Keyword(s):  
Protolytic Interactions

scholarly journals Protolytic properties of the structurally rigid analogs of 2,6-distyrylpyridine. Widening the pH sensitivity range by the photochemical E→Z isomerisation and introduction of substituents capable to protolytic interactions

2010 ◽  
Vol 8 (4) ◽  
pp. 766-782
Author(s):  
Oleksiy Grygorovych ◽  
Oleksiy Nevskii ◽  
Sofia Moskalenko ◽  
Vasyl Pivovarenko ◽  
Andrey Doroshenko
Keyword(s):  
Full Range ◽  
Proton Donor ◽  
Ph Sensitivity ◽  
Proton Acceptor ◽  
Acid Base ◽  
Multi Stage ◽  
Protolytic Interactions ◽  
Pyridine Nitrogen ◽  
Sensitivity Range ◽  
Wide Range

AbstractProtolytic interactions in the series of prospective fluorescent ratiometric wide-range pH indicators — structurally rigid analogs of 2,6-distyrylpyridine — (3E,5E)-3,5-dibenzylidene-8-phenyl-1,2,3,5,6,7-hexahydrodicyclopentano[b,e]pyridine — were investigated. The pyridine nitrogen atom basicity in these compounds is significantly lower in comparison with that of unsubstituted heterocycle and 2,6-distyrylpyridine. The photochemical E→Z photoisomerization and the side benzene rings substituents influence on the acid-base equilibria were studied. The complex multi-stage mechanism of the acid-base interactions of the polysubstituted compounds was elucidated. The most significant spectral effects were typical to the N,N-dialkylamino substituted compounds of the investigated series. The widest pH sensitivity interval covering nearly the full range of 0–14 units was demonstrated for compounds with both proton donor and proton acceptor substituents.

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