Development of efficient luminescent soft media by incorporation of a hetero-ligand macrocyclic terbium complex into a l
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Development of efficient luminescent soft media by incorporation of a hetero-ligand macrocyclic terbium complex into a lyomesophase* N. M. Selivanova,a M. V. Zimina,a P. L. Padnya,b I. I. Stoikov,b A. T. Gubaidullin,c and Yu. G. Galyametdinova aKazan
National Research Technological University, 68 ul. Karla Marksa, 420015 Kazan, Russian Federation. Fax: +7 (843) 231 4177. E-mail: [email protected] bKazan (Volga Region) Federal University, 18 ul. Kremlevskaya, 420008 Kazan, Russian Federation cArbuzov Institute of Organic and Physical Chemistry, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", 8 ul. Akad. Arbuzova, 420088 Kazan, Russian Federation A new approach to the synthesis of luminescent soft media using a terbium β-diketonate complex and substituted p-tert-butylthiacalix[4]arene containing quaternary ammonium fragments with amino acid substituents in the lower rim was developed. The synthesized heteroligand complex was incorporated into the framework of the lyotropic mesophase P123—C2H6O2. The liquid crystal properties of the P123—C2H6O2 binary system were studied and the concentration limits of the complex incorporation into the lyomesophase were determined. The longperiod ordered structures of lyomesophases was confirmed by small-angle X-ray scattering measurements. The intermolecular interactions of the system components were estimated by IR spectroscopy. The luminescent properties of lyomesophases including a hetero-ligand macrocyclic complex and a low-molecular-weight analog based on an ionic liquid were analyzed. Enhanced luminescence efficiency was observed for lyomesophases with the macrocyclic complex. Key words: terbium β-diketonate, substituted p-tert-butylthiacalix[4]arene, lyotropic liquid crystals, Pluronic, luminescence.
The growing interest of researchers in the field of development of luminescent soft materials is due to a fairly wide area of their practical application in biomedicine and molecular electronics.1 The most promising are luminescent hybrid materials based on lanthanide complexes, which have a number of unique photophysical properties, such as high intensity and narrow emission band, long lifetime and the ability, depending on the lanthanide ion, to vary radiation in a wide wavelength range (IR and UV).2,3 β-Diketones are well studied among the chromophore organic ligands for lanthanide ions. However, such complexes are characterized by low stability at high temperatures and under UV radiation. They are also prone to the concentration self-quenching effect, which necessitates the development of new approaches to the design of stable luminescent media. The modern method of obtaining functional soft materials consists in the solubilization of lanthanide complexes in ionic liquids.4 Ionic liquids are characterized by a wide temperature range of the liquid * Based on the materials of the XXI Mendeleev Congress on General and Applied Chemistry (September 9—13, 2019, St. Petersburg, Russia).
state, low melting point, low volatility, thermal stabilit
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