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    Ultrathin Langmuir-Schaefer films of slipped-cofacial J-type phthalocyanine dimer: Supramolecular organization, UV/Vis/NIR study and nonlinear absorbance of femtosecond laser radiation

    Year: 2021

    Journal: Appl. Surf. Sci., Volume 545, APR 15

    Authors: Kazak, Alexandr V.; Marchenkova, Margarita A.; Khorkov, Kirill S.; Kochuev, Dmitriy A.; Rogachev, Alexandr V.; Kholodkov, Igor V.; Usol'tseva, Nadezhda V.; Savelyev, Mikhail S.; Tolbin, Alexander Yu

    Organizations: Ministry of Education and Science of the Russian Federation [FZZM2020-0006, 075-03-2020-046/1]; Ministry of Science and Higher Education; RFBR [19-03-00763a, 19-57-04002bel_mol_a, 20-07-00181a]; Russian Federation [MK3767.2019.9]; [0090-2019-0003]

    Keywords: Slipped-cofacial J-type phthalocyanine dimers; Floating layers; Langmuir-Schaefer films; Supramolecular organization; UV/Vis/NIR spectral studies; Femtosecond nonlinear absorbance

    Based on a comprehensive theoretical and experimental approach, a low-defect thin film of stable dimeric phthalocyanine zinc complex (bis[2-hydroxy-9(10),16(17), 23(24)-tri-tert-butylphthalocyaninel zinc - J-[(PcZn)-Pc-OH-Zn-t](2)) was prepared. It is shown that the dye forms stable amorphous edge-on monolayers at the air/water interface with an insignificant content of cylindrical 3D aggregates. These floating layers keep their structure when transferred by the Langmuir-Schaefer method onto a solid substrate, demonstrating a tendency towards ordered H-aggregation with preserving their linear molecular properties. Mixed two- and three-photon absorption of femtosecond laser pulses (280 fs) was firstly detected on this sample, as well as the ability of a material to the nonlinear attenuation of the intense irradiation, which is important for optical limiting.
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