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Titolo:
A new approach to the IR spectroscopic study of molecular orientation and packing in adsorbed monolayers. Orientation and packing of long-chain primary amines and alcohols on quartz
Autore:
Chernyshova, IV; Rao, KH;
Indirizzi:
Lulea Univ Technol, Dept Chem & Met Engn, Div Mineral Proc, SE-97187 Lulea, Sweden Lulea Univ Technol Lulea Sweden SE-97187 al Proc, SE-97187 Lulea, Sweden
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 4, volume: 105, anno: 2001,
pagine: 810 - 820
SICI:
1520-6106(20010201)105:4<810:ANATTI>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
LANGMUIR-BLODGETT-FILMS; AIR-WATER-INTERFACE; INFRARED EXTERNAL-REFLECTION; ATTENUATED TOTAL-REFLECTION; SELF-ASSEMBLED MONOLAYERS; WELL-ORDERED STRUCTURE; IN-SITU; QUANTITATIVE-DETERMINATION; VIBRATIONAL SPECTROSCOPY; ABSORPTION-SPECTROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
76
Recensione:
Indirizzi per estratti:
Indirizzo: Chernyshova, IV Lulea Univ Technol, Dept Chem & Met Engn, Div Mineral Proc, SE-97187 Lulea, Sweden Lulea Univ Technol Lulea Sweden SE-97187 7 Lulea, Sweden
Citazione:
I.V. Chernyshova e K.H. Rao, "A new approach to the IR spectroscopic study of molecular orientation and packing in adsorbed monolayers. Orientation and packing of long-chain primary amines and alcohols on quartz", J PHYS CH B, 105(4), 2001, pp. 810-820

Abstract

A new method is suggested for determining the molecular orientation in adsorbed films with uniaxial and biaxial anisotropy from two (s- and rho -polarized) IRRAS spectra of the same sample, measured at the optimal angle of incidence. The method is simple, does not use the film thickness, and is internally stable with respect to the uncertainty in the input optical parameters of the anisotropic film. The advantages and limitations of the method are discussed. To validate the method, we determined the orientation of hexadecylamine and hexadecyl alcohol adsorbed on a quartz surface. It is shown that at a concentration above the concentration of 2D precipitation but below the concentration of 3D precipitation, hydrocarbon chains in the adsorbed amine monolayer are well-packed in a monoclinic (biaxial) subcell with a tilt angle of about 30 degrees. Chaotically arranged crystallites of the amine molecules appear at the surface at a concentration higher than the concentration of 3D precipitation. Adsorbed monolayers of the alcohol turn out to have a hexagonal structure, in which the hydrocarbon tails are "flip-flop" positioned and tilted by 25-30 degrees from the surface normal.

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Documento generato il 30/09/20 alle ore 09:30:01