1. Novel octabromo-substituted lanthanide(III) phthalocyanines – Prospective compounds for nonlinear optics
- Author
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Elena A. Kuzmina, Pavel N. Vasilevsky, Nataliya E. Borisova, Larisa G. Tomilova, Mikhail S. Saveliev, Alexander Yu. Gerasimenko, and Tatiana V. Dubinina
- Subjects
Lanthanide ,education.field_of_study ,Materials science ,Process Chemistry and Technology ,General Chemical Engineering ,Population ,chemistry.chemical_element ,Nonlinear optics ,Terbium ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Absorption band ,Bathochromic shift ,Phthalocyanine ,0210 nano-technology ,Europium ,education - Abstract
Novel octabromo-substituted lanthanide(III) phthalocyanines were obtained via template method starting from corresponding 4,5-dibromophthalonitrile and identified by high-resolution mass-spectrometry, 1H nuclear magnetic resonanse and infra red spectroscopy. To achieve an initial 4,5-dibromophthalonitrile the reaction conditions of Pd(0) catalyzed cyanation were optimized. The peripheral bromine atoms impact on the optical properties of phthalocyanine complexes. The bathochromic shift of the main absorption band (Q band) was observed going from unsubstituted to octachloro- and then to octabromo-substituted phthalocyanines. All complexes demonstrated nonlinear optical responses in the DMF solution. Increasing the intensity of laser radiation leads to a nonlinear decrease in transmittance and further restoration of optical properties when switching back to linear mode. Nonlinear optical responses depend on the central ion nature. Europium phthalocyanine showed the enhanced nonlinear absorption coefficient compared to lutetium and terbium complexes. This was caused by an enhanced population of excited state and faster excitement for complexes with large central ions. The impact of peripheral bromine groups into nonlinear optical properties was determined through the comparison with unsubstituted analogues.
- Published
- 2021
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