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Fluorescent dye N,N'-dioctadecylrhodamine as a new interfacial acid-base indicator
N O McHedlov-Petrossyan1, N A Vodolazkaya, O N Bezkrovnaya
1V.N. Karazin Kharkov National University, 61077 Kharkov, Ukraine. mchedlov@univer.kharkov.ua
Abstract:
This paper reports the spectral properties and protolytic behavior of the fluorescent dye N,N'-dioctadecylrhodamine on the micelle/water and microdroplet/water interfaces as well as in Langmuir-Blodgett films soaked into aqueous media. Long hydrocarbon chains provide similar orientation of its cation and zwitterion, with the dissociating group (COOH-->COO(-)) directed toward the bulk (aqueous) phase. Both absorption and fluorescence of the dye can be used for monitoring electrical surface potentials and for determination of bulk pH.
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