Atypical Behavior of a New Dialkyl Macrocycloureide in Langmuir−Blodgett Film Formation

Dumaine-Bouaziz, M.; Morelis, Renée; Cordier, D; Coulet, Pierre R.

doi:10.1021/la980588b

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…A similar behavior was observed by Dumaine-Bouaziz et al on a dialkyl-macrocycloureide, studied in the same range of temperatures, 15−35 °C. The plateau, ascribed to a bilayer formation, remained at the same surface pressure regardless of the temperature; a strong hysteretic compression−expansion behavior was observed once the beginning of the plateau had been reached; a less packed monolayer was obtained at 35 °C and at low surface pressures; and a drastic decrease of the molecular area was observed at high surface pressures when the temperature increases.…”

Section: Resultssupporting

confidence: 86%

Organization of meso-Tetra(4-N-stearylpyridyl)porphine in Pure and Mixed Monolayers at the Air/Water Interface and in Langmuir−Blodgett Films

Silva¹,

Viseu²,

Malathi³

et al. 1999

Langmuir

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The molecular packing of meso-tetra(4-N-stearylpyridyl)porphine tetra-p-toluenesulfonate (PO) was investigated at the air/water interface and in Langmuir−Blodgett (LB) films in progressively more complex systems, namely, the pure component PO, PO mixed with sodium hexadecyl sulfate (SHS), and PO mixed with SHS and stearic acid (SA). The LB films formed at selected surface pressures have been analyzed by UV−visible absorption spectroscopy. The long transition in the pure PO monolayer was ascribed to changes in the orientation of PO bases, from parallel to oblique orientation, toward the water surface. At the interface, the PO/4SHS mixture exhibits two transitions: a low surface pressure transition, attributed to a closer arrangement favoring electrostatic interactions; and a high surface pressure transition, ascribed to the formation of an interdigitated double layer. The PO/4SHS/4SA system exhibits the high surface pressure transition in a short range of areas. This behavior was ascribed to the coexistence of two mechanisms of long chain dense packing: the filling of PO/4SHS bases by SA molecules and the double layer interdigitation of PO/4SHS. On increasing the SA content in the ternary mixture, the transition disappears and a solid condensed monolayer, induced by the long chain packing, begins at low surface pressures.

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Section: Resultssupporting

confidence: 86%