ISAKOVA Aleksandra A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of RAS

Self-assembled Nanostructures based on Yttrium(III) Tetra-15-Crown-5-Phthalocyaninate

Co-authors LAPKINA Ludmila, MARTYNOV Alexandr, ABKHALIMOV Evgeny , GORBUNOVA Yulia, GRISHINA Antonina, VANNIKOV nikov Anatoly, TSIVADZE Aslan
Collaboration: S. Kurnakov Institute of General and Inorganic Chemistry RAS, Moscow, Russian Federation

Optical and electrochemical properties of materials, based on phthalocyanines, are strongly influenced by their supramolecular organization in solid phase (crystals, polymeric composites, thin films). However, the understanding of the behavior of phthalocyanine complexes in solution and their tendency to aggregation due to weak intermolecular interactions allows to predict the assembling of molecules in the solid state. Herein, we performed systematic investigation of self-assembly of yttrium tetra-15-crown-5-phthalocyaninate-acetate (1) in tetrachloroethane (TCE) solution. Studies were performed by means of transmission electron and atom force microscopy (TEM and AFM), as well as UV-Vis spectroscopy and dynamic light scattering (DLS). DLS studies revealed that successive heating/cooling cycles, applied to solution of (1) in TCE resulted in formation of nanoparticles. Their formation was observed even after the first cycle, growth of particles occurred in next cycles. This process was followed by hypsochromic shift of Q-band in UV-Vis spectra of investigated solutions from 680 to 640 nm, suggesting formation of cofacial supramolecular assemblies (H-aggregates). The diameter (15 nm) and length (250 nm) of nanoparticles were determined by AFM. TEM studies of these particles suggest their crystalline structure, due to characteristic electron diffraction picture. The proposed approach can be used for elaboration of novel optoelectronic materials. For example, polyvinylcarbazole composites doped with the similar nanoparticles based on Ru(II) complexes reveal enhanced nonlinear optical properties (*). The study of optoelectronic properties of composites based on obtained nanoparticles is in the progress. (*) Grishina, A.D.; Gorbunova, Y.G.; Zolotarevsky V.I., et. al. J. Porphyr. Phthalocyanines 2009, 13, 92–98. ACKNOWLEDGEMENTS: This work was supported by grants from OPTEC LLC (Contract № 49/2014/75-Msk) and Russian Foundation for Basic Research (14-03-00049-а, № 14-03-31425_mol_a).