Fluorescent dye N,N'-dioctadecylrhodamine as a new interfacial acid-base indicator.
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.
McHedlov-Petrossyan
N O
NO
V.N. Karazin Kharkov National University, 61077 Kharkov, Ukraine. mchedlov@univer.kharkov.ua
Vodolazkaya
N A
NA
Bezkrovnaya
O N
ON
Yakubovskaya
A G
AG
Tolmachev
A V
AV
Grigorovich
A V
AV
D005456:Fluorescent Dyes / Q000737:chemistry*; D007202:Indicators and Reagents; D008823:Micelles; D012235:Rhodamines / Q000737:chemistry*; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013229:Stearic Acids / Q000737:chemistry
D005456:Fluorescent Dyes; D007202:Indicators and Reagents; D008823:Micelles; C529664:N,N'-dioctadecylrhodamine; D012235:Rhodamines; D012996:Solutions; D013229:Stearic Acids; C031183:stearic acid