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    Thermodynamics and in-situ absorption of Langmuir monolayers of selected copper phthalocyanine substituted with different peripheral groups

    Year: 2010

    Journal: Dyes and Pigments (2010), Volume Date 2011, 89(1), 86-92, 20121205

    Authors: Biadasz, A.; Bursa, B.; Barszcz, B.; Bogucki, A.; Laskowska, B.; Graja, A.; Wrobel, D.

    Organizations: Faculty of Technical Physics, Institute of Physics, Poznan University of Technology, 60-965 Poznań, Poland; Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznań, Poland

    The paper deals with thermodynamic and spectroscopic characterization of Langmuir layers of phthalocyanines substituted with different peripheral groups: copper(II) 2,9,16,23-tetra-tert-butyl-29H,31H-phthalocyanine, copper(II) 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H,31H-phthalocyanine, copper(II) tetrakis(4-cumylphenoxy)phthalocyanine. The isotherms, compressibility and stability of the Langmuir layers are investigated. Molecular arrangement of the molecular skeleton on water substrate is also evaluated. The essential influence of the substituents attached to the phthalocyanine macroring on dye thermodynamic properties is shown. The in-situ absorption of the phthalocyanine monolayers and electronic absorption spectra of dye solution in chloroform support existence of aggregates which architecture depends on the dye molecular structure.