The Effect of Alkyl Substituent Length on Receptor Properties of Dithia-Aza-Crown-Hemicyanine Monolayersстатья
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Аннотация:Planar supramolecular systems based on Langmuir monolayers of chro-moionophores are widely used for sensor applications, and crown-ether ionophoric groups are intensively studied. However almost no attention is devoted to investigation of effect of alkyl groups onto receptor properties of such systems. In the present work, we carry out a comparative study of Langmuir monolayers three dithia-aza-crown-substituted hemicyanine chromoionophores differing only in number of carbon atoms (12, 16, 21) in the hydrophobic alkyl substituent. A dependence of receptor properties of the studied compounds on the length of alkyl fragment is revealed. It is shown that in the absence of barium cations capable of preorganizing the monolayer, the efficiency of mercury ion binding of all three dyes is identical due to key role of the aggregation state of molecules in the monolayer. Degree of system sensitivity enhancement due to barium cation-induced preorganization increases with increase of number of carbon atoms in the alkyl chain.