Langmuir monolayers based on rigid wedge-shaped dendrons of benzenesulfonic acid

The structure formation of wedge-shaped monodendrons based on symmetric benzenesulfonic acid with different lengths of peripheral alkyl chains was studied in Langmuir monolayers and Langmuir–Blodgett (LB) films. A phase transition from the liquid-expanded state to the liquid-condensed state was obse...

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Bibliographic Details
Published in:Russian chemical bulletin 2018-09, Vol.67 (9), p.1589-1594
Main Authors: Malakhova, Yu. N., Stupnikov, A. A., Bakirov, A. V., Shcherbina, M. A., Beginn, U., Chvalun, S. N.
Format: Article
Language:English
Subjects:
Benzenesulfonic acids
Brewster angle
Chains
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Film thickness
Inorganic Chemistry
Langmuir-Blodgett films
Monolayers
Monomolecular films
Organic Chemistry
Phase transitions
Substrates
Wedges
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Summary:The structure formation of wedge-shaped monodendrons based on symmetric benzenesulfonic acid with different lengths of peripheral alkyl chains was studied in Langmuir monolayers and Langmuir–Blodgett (LB) films. A phase transition from the liquid-expanded state to the liquid-condensed state was observed on compression of the Langmuir monolayers of the dendrons containing dodecyl lateral chains. The transition is accompanied by the formation of star-shaped aggregates visualized by Brewster angle microscopy. The three-layer LB transfer results in the reorganization of the monolayer into regions of bi-, tetra-, and hexalayers on a solid substrate with a low coverage of the surface. Homogeneous liquid-condensed mono layers are formed for the dendrons with hexa- and octadecyl chains, and the film thickness achieved by the LB transfer corresponds to the monolayer alignment of the molecules with the surface coverage up to 90%. It was determined that varying the alkyl length of wedge-shaped dendrones based on symmetric benzenesulfonic acid leads to a change in phase behavior of Langmuir monolayers as well as Langmuir–Blodgett films formed by them.
ISSN:1066-5285
1573-9171
DOI:10.1007/s11172-018-2262-9