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Titolo:
Rotational dynamics of nondipolar probes in alkane-alkanol mixtures: Microscopic friction on hydrogen bonding and nonhydrogen bonding solute molecules
Autore:
Dutt, GB;
Indirizzi:
Bhabha Atom Res Ctr, Radiat Chem & Chem Dynam Div, Bombay 400085, Maharashtra, India Bhabha Atom Res Ctr Bombay Maharashtra India 400085 5, Maharashtra, India
Titolo Testata:
JOURNAL OF CHEMICAL PHYSICS
fascicolo: 24, volume: 113, anno: 2000,
pagine: 11154 - 11158
SICI:
0021-9606(200012)113:24<11154:RDONPI>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
PICOSECOND REORIENTATIONAL DYNAMICS; POLAR DYE PROBES; DIELECTRIC FRICTION; PYRROLOPYRROLE DERIVATIVES; DIFFUSION; FLUORESCENCE; SPECTROSCOPY; ALCOHOLS; PIGMENT; STATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Dutt, GB Bhabha Atom Res Ctr, Radiat Chem & Chem Dynam Div, Bombay 400085,Maharashtra, India Bhabha Atom Res Ctr Bombay Maharashtra India 400085 shtra, India
Citazione:
G.B. Dutt, "Rotational dynamics of nondipolar probes in alkane-alkanol mixtures: Microscopic friction on hydrogen bonding and nonhydrogen bonding solute molecules", J CHEM PHYS, 113(24), 2000, pp. 11154-11158

Abstract

Rotational dynamics of two structurally similar nondipolar probes; 2,5-dimethyl-1,4-dioxo-3,6-di- phenylpyrrolo[3,4-c]pyrrole (DMDPP) and 1,4-dioxo-3,6-diphenylpyrrolo[3,4-c]pyrrole (DPP) has been studied in mixtures of squalane-1-butanol with the idea of finding out the role of size, chemical composition, and viscosity of the solvent on the friction experienced by hydrogen bonding (DPP) and nonhydrogen bonding (DMDPP) solute molecules. Althoughthe reorientation times of both the probes followed a power law dependenceon the solvent viscosity, DPP is found to rotate two to three times slowerthan DMDPP due to solute-solvent hydrogen bonding. The observed size effects of DMDPP have been modeled using the quasihydrodynamic theory of Gierer-Wirtz (GW). The rotational dynamics of DPP, however, follows stick hydrodynamics in the butanol rich region due to solute-solvent hydrogen bonding. But at higher concentrations of squalane, DPP gets preferentially located in a cagelike structure formed by butanol molecules and even this DPP-1-butanol complex experiences microscopic friction. (C) 2000 American Institute of Physics. [S0021-9606(00)50348-1].

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Documento generato il 16/07/20 alle ore 19:41:21