Photophysical properties of izomeric N-chlorobenzyl substituted (E)-2′ (3′-or 4′)-hydroxy-4-stilbazolium chlorides in alcohols

Literature Information

Publication Date 2011-03-15
DOI 10.1039/C0CP02587A
Impact Factor 3.676
Authors

Dorota Prukała, Wiesław Prukała, Igor Khmelinskii, Marek Sikorski


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Abstract

Absorption and steady-state fluorescence spectra of nine N-p-(m- and o-) chlorobenzyl substituted (E)-2′-(3′ and 4′)-hydroxy-4-stilbazolium chlorides belonging to the hemicyanine class of compounds were studied in extra dry alcohols of different polarity. Derivatives with 2′-hydroxy or 4′-hydroxy substituent in the benzene moiety of stilbazol molecule displayed negative solvatochromizm. On the other hand, the excited state decay of compounds with a 3′-hydroxy group in the benzene moiety was dominated by non-radiative processes in protic solvents. Solutions of each of the compounds are yellow in extra dry solvents, red in solvents with small amount of water and yellow again if more water is added. The absorbance and steady-state fluorescence methods were used to explain the protonation/deprotonation processes for N-p-chlorobenzyl-(E)-4′-hydroxy-4-stilbazolium chloride and its zwitterionic or quinoid form in 2-propanol responsible for these phenomena.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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