Characterization of Multifunctional Reverse Micelles Interfaces Using Hemicyanines as Molecular Probes. 1: Effect of the hemicyanines? Structure.

MOYANO F.; QUINTANA S.; FALCONE R.D.; SILBER J.J.; CORREA N.M*

JOURNAL OF PHYSICAL CHEMISTRY B

American Chemical Society (ACS)

Año: 2009 vol. 113 p. 4284 - 4292

1089-5647

In this work we report the behavior of two different hemicyanines: trans-4-[4-(dimethylamino)-styryl]-N-methylpyridinium iodide (HC) and, 4-[4-(dihexadecylamino)-styryl]-N-methyl-pyridinium iodide (DIA) in water/ sodium 1,4-bis-2-ethylhexylsulfosuccinate (AOT)/benzene reverse micelles media using absorption and emission spectroscopy in addition to the steady-state and time-resolved fluorescence emission techniques. Our results show that the AOT reverse micelles interface has the non-trivial de-aggregation property, result that may have potential application for the preparation of dyes lasers, which require a non-interacting monomeric form of the dye. Also, we show that the water interacts with different region of the AOT moiety depending on the external organic solvent used and, in addition we also present a nice, simple and noteworthy method that help to examine the presence or the absence of organized media. In conclusion, our results show that HC and DIA are powerful dyes to characterize simultaneously different interfaces properties as they can be used to sense, at the same time, fluidity and specific interactions at the interface. These results are important because those properties are the key for the molecular recognition.