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

    Year: 2018

    Journal: Russ. Chem. Bull., Volume 67, SEP, page 1589–1594

    Authors: Malakhova, Yu. N.; Stupnikov, A. A.; Bakirov, A. V.; Shcherbina, M. A.; Beginn, U.; Chvalun, S. N.

    Organizations: Russian Foundation for Basic Research [18-03-00967a, 16-33-60194mol_a_dk]

    Keywords: self-organization; Langmuir monolayer; wedge-shaped monodendrons

    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.
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