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    Floating layers and thin films of mesogenic mix-substituted phthalocyanine holmium complex

    Year: 2020

    Journal: Thin Solid Films, Volume 704, JUN 30

    Authors: Kazak, AV; Marchenkova, MA; Smirnova, AI; Seregin, AY; Rogachev, AV; Klechkovskaya, VV; Arkharova, NA; Warias, JE; Murphy, BM; Tereschenko, EY; Usol'tseva, NV; Kovalchuk, MV

    Organizations: Ministry of Education and Science of the Russian FederationMinistry of Education and Science, Russian Federation [FZZM-2020-0006]; Ministry of Science and Higher EducationMinistry of Science and Higher Education, PolandEuropean Commission; RFBRRussian Foundation for Basic Research (RFBR) [19-0300763a, 19-57-04002bel_mol_a, 20-07-00181a]; Program of the President of the Russian Federation [MK-3767.2019.9]; Bundesministerium fur Bildung und Forschung (BMBF)Federal Ministry of Education & Research (BMBF) [05K13FK2, 05K16FK1]

    Keywords: Mix-substituted phthalocyanine; Metallomesogens; Monolayers; Langmuir-Schaefer films; Structure

    The supramolecular organization of the A(3)B-type phthalocyanine holmium complex (A(3)B-Ho) was investigated in floating layers at the air-water interface and in Langmuir-Schaefer thin films at the air-solid interface. The floating layers formed under different experimental conditions on the water subphase using the Langmuir technique. They were studied by Brewster angle microscopy, grazing incidence X-ray diffraction and X-ray reflectometry. It was established that molecules of A(3)B-Ho form stable ordered floating monolayer on the water surface. Experimental conditions required for this monolayer formation were determined as following: the initial degree of coating of the water surface was 18%, the compression rate of barriers was 6 cm(2)/min and the surface pressure was 0.4 mN/m. Under these conditions a stable crystalline monolayer structure was obtained with an area per one molecule 3.9 nm(2). It has a two-dimensional face-on packing with the intralayer period of 2.06 nm. The Langmuir-Schaefer thin film was obtained on the basis of the above mentioned monomolecular floating layer. The film possesses a single two-dimensional structure with the packing of the molecules parralel to the substrate surface that was revealed by electron diffraction. The lattice parameters of the monomolecular film were a = 1.65 nm, b = 1.92 nm, gamma(1) = 75. It was shown that the film preserves the structure of the floating monolayer.
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