Anisotropy and Spectroscopic Properties of the Complexes of meso -Tetra(4-Carboxyphenyl)Porphyrin Molecules with Diamond
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PHOTONICS
Anisotropy and Spectroscopic Properties of the Complexes of meso-Tetra(4-Carboxyphenyl)Porphyrin Molecules with Diamond Nanoparticles Ju. A. Kalvinkovskayaa, *, Yu. B. Tsaplevb, A. V. Trofimovb, c, A. A. Romanenkoa, S. B. Bushukd, T. A. Pavicha, and V. A. Lapinaa aStepanov
Institute of Physics, National Academy of Sciences of Belarus, Minsk, 220072 Belarus Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, 119334 Russia c Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow oblast, 141701 Russia dSSPA Optics, Optoelectronics, and Laser Technology, Minsk, 220072 Belarus *e-mail: [email protected] b
Received January 23, 2020; revised January 23, 2020; accepted March 15, 2020
Abstract—The complexes of meso-tetra(4-carboxyphenyl)porphyrin with nanoscale diamonds were studied by spectroscopic methods. The polarization characteristics of their steady-state fluorescence indicate the formation of a covalently bound complex between porphyrin molecules and diamond nanoparticles. Using the data of steady-state fluorescence anisotropy, the hydrodynamic volumes of the studied complexes were estimated. The measurements showed that the photophysical properties of porphyrin barely change upon the formation of an organic–inorganic hybrid complex with nanodiamonds. The studied complexes can be promising in the field of biomedical research, in particular, in diagnosing and developing a new generation of photosensitizers for practical medicine. Keywords: nanoscale diamonds, meso-tetra(4-carboxyphenyl)porphyrin, spectral-luminescent properties, steady-state fluorescence anisotropy, photosensitizers DOI: 10.1134/S0030400X20090118
INTRODUCTION Porphyrins are an important class of pigments, the study of the photophysical properties of which is of great interest, since they determine their biological activity and applications in practical medicine. It is known that porphyrins can be used as photoactive agents in various optical technologies, in particular, as photosensitizers for photodynamic therapy (PDT). In this regard, particular attention is paid to porphyrins with hydrophilic side groups, since they have high solubility in aqueous solutions [1, 2]. However, porphyrin molecules are capable of various aggregation reactions, such as the formation of dimers, oligomers, etc. [3], owing to the presence of charged groups that have a substantial effect on their photophysical and functional properties [4, 5]. Numerous studies devoted to the search for porphyrin molecule carriers that would allow one to modulate their properties, in particular, to inhibit extensive aggregation and preserve the properties inherent in their monomer form, are currently underway [6, 7]. Nanodiamond particles are among such carriers, since they can be effectively modified owing to the availability of developed surface chemis-
try [8] and can form hybrid organic–inorganic complexes [9, 10]. In this work, the formation and properties of an organic–inorganic hybrid complex of m
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