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Titolo:
Behavior of the solvatochromic probes Reichardt's dye, pyrene, dansylamide, Nile Red and 1-pyrenecarbaldehyde within the room-temperature ionic liquid bmimPF(6)
Autore:
Fletcher, KA; Storey, IA; Hendricks, AE; Pandey, S; Pandey, S;
Indirizzi:
New Mexico Inst Min & Technol, Dept Chem, Socorro, NM 87801 USA New MexicoInst Min & Technol Socorro NM USA 87801 Socorro, NM 87801 USA
Titolo Testata:
GREEN CHEMISTRY
fascicolo: 5, volume: 3, anno: 2001,
pagine: 210 - 215
SICI:
1463-9262(200110)3:5<210:BOTSPR>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEPENDENT FLUORESCENCE; MOLTEN-SALTS; POLARITY; EXTRACTION; SOLVENTS; GREEN; TECHNOLOGY; CATALYST; SCALE; CO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Pandey, S New Mexico Inst Min & Technol, Dept Chem, Socorro, NM 87801 USA New Mexico Inst Min & Technol Socorro NM USA 87801 NM 87801 USA
Citazione:
K.A. Fletcher et al., "Behavior of the solvatochromic probes Reichardt's dye, pyrene, dansylamide, Nile Red and 1-pyrenecarbaldehyde within the room-temperature ionic liquid bmimPF(6)", GREEN CHEM, 3(5), 2001, pp. 210-215

Abstract

Recently discovered room-temperature ionic liquids (RTILs) show tremendouspromise to replace volatile organic compounds (VOC). Investigation of these RTILs as solvents is in very early stages. Before the full potential of these RTILs are realized, much more information about them as solvent systems must be obtained. The dipolarity of one such RTIL, 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF(6)) is investigated using both absorbance(Reichardt's betaine dye) and fluorescence (pyrene, dansylamide, Nile Red,and 1-pyrenecarbaldehyde) solvatochromic probes. Results indicate that, inthe case of pyrene and 1-pyrenecarbaldehyde the bmimPF(6) microenvironmentimmediately surrounding the probe is similar to the microenvironment sensed in acetonitrile and dimethyl sulfoxide. Dansylamide in bmimPF(6) sensed amicroenvironment similar to that in acetonitrile. However, calculated E-T(30) values indicate the polarity of bmimPF(6) sensed by Reichardt's betainedye to be similar to ethanol. Nile Red showed that the polarity of the solvent in the immediate vicinity of the probe is similar to neat water and 90wt% glycerol in water (a solvent with viscosity similar to bmimPF(6)). Themicroenvironment sensed by a probe is dependent upon several factors besides polarity such as viscosity, polarizability, the ability to form hydrogen-bonds, etc. In light of this, the apparent discrepancies in the polarity of bmimPF(6) indicated in this study do not seem so vast.

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Documento generato il 29/09/20 alle ore 10:05:38