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A. V. Kazak¹, N. V. Usol'tseva¹, S. G. Yudin², A. V. Alpatova², A. S. Semeikin³, V. V. Bykova¹

Author affiliations
¹Ivanovo State University, Nanomaterials Research Institute
153025 Russia, Ivanovo, Ermak Str., 39. 
E-mail: s_kazak@list.ru
²A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences
119333 Russia, Moscow, Leninsky Av., 59
³Ivanovo State University of Chemistry and Technology
153000 Russia, Ivanovo, F. Engel's Av., 7

Abstract
Thin films of meso-substituted tetraphenylporphyrin with the substitution by alkoxy-groups (–OC₄H₉ or –OC₁₆H₃₃) in para- or ortho-positions of phenyl rings were derived by the Langmuir-Blodgett method. Behavior of molecules of porphyrin derivatives on the water surface was studied. The regularities of the influence of molecular structure on the supramolecu-lar organization of floating layers were found. Films were obtained by transporting layers of compounds from the water surface to the glass bases by the Langmuir-Schaefer method. The absorption spectra of Langmuir-Blodgett films in a wide spectral range were investigated. It is established that not only the position but also length of substituents affects the optical properties of the films. The shape of the spectrum is also influenced by the presence of a particular metal in the structure of the molecule.

Keywords: porphyrin, structure, absorption spectrum, Langmuir films