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Titolo:
X-ray scattering studies of mixed langmuir monolayers and Langmuir-Blodgett films of a noncentrosymmetric porphyrin with cadmium arachidate
Autore:
Peng, JB; Barnes, GT; Gentle, IR; Foran, GJ; Le, TH; Crossley, MJ;
Indirizzi:
Univ Queensland, Dept Chem, Brisbane, Qld 4072, Australia Univ QueenslandBrisbane Qld Australia 4072 Brisbane, Qld 4072, Australia Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia Australian Nucl Sci & Technol Org Menai NSW Australia 2234 234, Australia Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia Univ Sydney Sydney NSWAustralia 2006 h Chem, Sydney, NSW 2006, Australia
Titolo Testata:
LANGMUIR
fascicolo: 6, volume: 17, anno: 2001,
pagine: 1936 - 1940
SICI:
0743-7463(20010320)17:6<1936:XSSOML>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMPHIPHILIC ZINC PHTHALOCYANINE; GRAZING-INCIDENCE DIFFRACTION; IMAGING-PLATE CAMERA; FOCUSING MONOCHROMATOR; HYDROPHOBIC PORPHYRIN; ORIENTATION CHANGE; TRIGGER MOLECULE; THIN-FILMS; TETRAKIS(3,5-DI-TERT-BUTYLPHENYL)PORPHINATOCOPPER(II); SURFACE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Peng, JB Univ Queensland, Dept Chem, Brisbane, Qld 4072, Australia Univ Queensland Brisbane Qld Australia 4072 Qld 4072, Australia
Citazione:
J.B. Peng et al., "X-ray scattering studies of mixed langmuir monolayers and Langmuir-Blodgett films of a noncentrosymmetric porphyrin with cadmium arachidate", LANGMUIR, 17(6), 2001, pp. 1936-1940

Abstract

The structures of mixed Langmuir (floating) monolayers and Langmuir-Blodgett (LB) films of a phenanthroline-porphyrin with cadmium arachidate (PhenPor + CdAr) have been investigated by synchrotron X-ray grazing incidence diffraction (GIXD) and specular X-ray reflectivity (SXR). GIXD measurements ofthe floating monolayers showed only one peak, arising from the CdAr domains in the films, at a scattering angle of 21.5 degrees. This is consistent with a hexagonal structure (alpha = 4.77 Angstrom). The correlation length in these domains is 250 Angstrom. GMD measurements of the LB films, however,show two sets of diffraction features: one arises from CdAr domains with arectangular in-plane structure (alpha = 7.44 Angstrom and b = 4.90 Angstrom) and a correlation length of 85 Angstrom; the other is from porphyrin domains with an oblique in-plane structure (alpha (p) 15.2 Angstrom, b(p) = 8.86 Angstrom, and gamma (p) = 80 degrees) and a correlation length of 105 Angstrom. These dimensions are consistent with the surface pressure-area isotherm measurements and indicate that the two components are immiscible. The thickness of the bilayer is 57 Angstrom, and there is no correlation between the bilayers. Introduction of a trigger compound does not alter the structure of the films but slightly increases the bilayer thickness. The SXR measurements of the floating monolayers also support the suggested immiscibility of the two components in the films.

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Documento generato il 11/07/20 alle ore 04:41:46