THE INFLUENCE OF THE NATURE OF SUBSTITUENTS ON LUMINESCENCE PROPERTIES OF MESOGENIC EUROPIUM(III) COMPLEXES

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THE INFLUENCE OF LEWIS BASES ON THE LIQUID-CRYSTALLINE AND PHOTOPHYSICAL PROPERTIES OF LANTHANIDE(III) COMPLEXES

68-6

Liquid Crystalline Complexes of Cu(II) and Pd(II) with Ferrocene-Containing Ligands

The new liquid crystalline heteronuclear complexes Cu(II) 1a and Pd(II) 1b with a non-mesogenic ferrocene-containing β-enaminoketone L1 of the formula C5H5FeC5H4-C6H 4-NH-C2H2-(CO)-C6H 4OC12H25, showing monotropic nematic and smectic A phases, are studied. The ortho-palladated Cl-bridged dimeric complex 3 with a non-mesogenic ferrocene-containing Schiffs base L2 of the formula C5H5FeC5H4-C6H 4-N=CH-C6H4OC10H21, forming a stable smectic A phase, has been synthesized. The novel mixed-ligand heteronuclear complexes 4-7 have been obtained by treatment of the ortho-palladated complex 3 with appropriate ligands. Some of the resulting products exhibit the rather low-melting (below 100deg;C) smectic A phases. Structures of the compounds are studied by elemental analysis, 1H and 13C NMR, and ESR spectroscopies

Stripping-voltammetric determination of transition metals using electrodes modified by azacrown compounds

Voltammetric properties of macrocyclic complexes of transition metals are studied by using a carbon-paste electrode modified by diaza-18-crown-6, Cyclam, and their derivatives. A selective stripping-voltammetric procedure is proposed for determining Ni(II) and Co(II) with a carbon-paste electrode modified by Cyclam and its derivatives. To improve the sensitivity and selectivity of analysis, it is suggested that metal ions be preconcentrated at the surface of the modified electrode by using a 0.1 M NaCl solution as a supporting electrolyte with the following recording of voltammograms in the range from -0.3 to 0.8 V in a 0.1 M KOH solution. The detection limits for Ni(II) and Co(II) are 4 × 10-8 and 1.2 × 10-7 M, respectively. © 1996 MAEe Cyrillic signK Hayκa/Interperiodica Publishing

Liquid-crystalline CuII and PdII complexes with nonmesogenic ferrocene-containing β-aminovinyl ketone

New liquid-crystalline heteropolynuclear complexes L2M (M = Cu2+ (2a), Pd2+ (2b)) were synthesized by the reactions of C5H5FeC5H4-C6H4NH-C2H2-(CO)-C6H4OC12H25 (1, LH) with copper(II) and palladium(II) acetates. Compound 2b was found to possess monotropic nematic and smectic phases; 2a exhibits the monotropic nematic phase and a phenomenon of "double melting." The compositions and structures of compounds 1 and 2a,b were established by elemental analysis, 1H and 13C NMR, ESR, and IR spectroscopy

Stripping-voltammetric determination of transition metals using electrodes modified by azacrown compounds

Voltammetric properties of macrocyclic complexes of transition metals are studied by using a carbon-paste electrode modified by diaza-18-crown-6, Cyclam, and their derivatives. A selective stripping-voltammetric procedure is proposed for determining Ni(II) and Co(II) with a carbon-paste electrode modified by Cyclam and its derivatives. To improve the sensitivity and selectivity of analysis, it is suggested that metal ions be preconcentrated at the surface of the modified electrode by using a 0.1 M NaCl solution as a supporting electrolyte with the following recording of voltammograms in the range from -0.3 to 0.8 V in a 0.1 M KOH solution. The detection limits for Ni(II) and Co(II) are 4 × 10-8 and 1.2 × 10-7 M, respectively. © 1996 MAEe Cyrillic signK Hayκa/Interperiodica Publishing

Theoretical Simulation of the Emission Efficiency of Mesogenic Europium(III) Complexes in Optoelectronic Materials

Relationships between liquid-crystalline properties, energies of the excited states, intra-molecular energy transfer rates, and quantum yields of some mesogenic europium(III) complexes were studied. Their application with conductive conjugated polymers in optoelectronic materials was evaluated.Квантово-химические расчеты были проведены с использованием суперкомпьютеров МВС-10П и МВС-100K «Межведомственного суперкомпьютерного центра РАН». Работа выполнена при финансовой поддержке проекта № ГСГК-0064/21. Проект реализуется победителем Конкурса на предоставление грантов преподавателям магистратуры благотворительной программы «Стипендиальная программа Владимира Потанина» Благотворительного фонда Владимира Потанина

QUANTUM-CHEMICAL STUDY OF OPTOELECTRONIC MATERIALS BASED ON SEMICONDUCTOR QUANTUM DOTS CDSECDS AND LIQUID-CRYSTALLINE POLYMERS

Quantum-chemical study of the interaction of some liquid-crystalline polymers with the surface of CdSeCdS quantum dots and the processes of intermolecular energy transfer showed that polymers can act as passivating surface agents and enhance the emission efficiency of quantum dots.Квантово-химические расчеты были выполнены с использованием суперкомпьютеров МВС-10П и МВС-100K «Межведомственного суперкомпьютерного центра РАН», вычислительных ресурсов «Ломоносов» и «Чебышев» суперкомпьютерного комплекса МГУ имени М.В. Ломоносова [1]

Physico-chemical properties of nanocomposites based on multi-component hybrid quantum dots

Composites of inorganic nano-objects such as quantum dots (QDs) and organic materials such as luminescent or polymers can be developed based on them for special applications such as optical devices, electro-optical devices and computing. In the study, nanocomposites based on multi-component quantum dots were obtained and nanocomposites were obtained by inserting them into polymethyl methacrylate (PMMA). First, core-shell hybrid quantum dots were synthesized, then core/shell/shell systems were obtained, and their absorption, luminescence spectra and sizes were obtained. In this work, information is presented about the opening of wide opportunities for the use of semiconductor nanocrystals related to obtaining new hybrid nanocomposite systems for nanomedicine and biomedicine