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- Mackeviča, Jevgeņija, et al.
(författare)
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Synthesis of 1,2,3-triazole-linked galactohybrids and their inhibitory activities on galectins
- 2014
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Ingår i: Arkivoc. - : ARKAT USA, Inc.. - 1551-7012. ; 2014:3, s. 90-112
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Tidskriftsartikel (refereegranskat)abstract
- Here a synthesis of novel galactose-1,2,3-triazole conjugates is described. The title compounds were obtained from 3-azido-3-deoxy-1,2: 5,6-di-O-isopropylidene-α-D-galactofuranose via a copper catalyzed azide-alkyne 1,3-dipolar cycloaddition reaction. It was demonstrated that the title compounds in their isopropylidene-protected form tend to chelate copper. The copper content can be diminished to 10 ppm by successive treatment with EDTA and Na2S followed by chromatographic purification. Acidic hydrolysis of the acetonide protecting groups provided water soluble galactohybrids that were tested for their affinity towards galectin-1 and galectin-3. The trimeric galactohybrid exhibited a 160-fold preference for galectin-3 binding with Kd 50 μM. One of the obtained disaccharides was characterized by X-ray analysis.
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| 2. |
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| 3. |
- Petrenko, Alla, et al.
(författare)
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Benzoselenophenylpyridine platinum complexes : green versus red phosphorescence towards hybrid OLEDs
- 2020
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Ingår i: Dalton Transactions. - : ROYAL SOC CHEMISTRY. - 1477-9226 .- 1477-9234. ; 49:11, s. 3393-3397
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Tidskriftsartikel (refereegranskat)abstract
- The first examples of phosphorescent platinum complexes bearing 2- and 3-(2-pyridyl)benzo[b]selenophenes (PyBSe) were synthesized and fully characterized. Almost identical ionization potential values (5.6 and 5.58 eV) of the solid samples of the Pt complexes were obtained by electron photoemission spectroscopy. Having slightly different molecular design, the solid solutions of the complexes emitted efficient green and red phosphorescence with absolute quantum yields of 52% (for green) and 11.6% (for red). It is demonstrated that the platinum complexes synthesized can be used as phosphorescent dopants for hybrid solution-processable OLEDs.
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| 4. |
- Ruduss, Armands, et al.
(författare)
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Thiazoline Carbene-Cu(I)-Amide complexes : Efficient White Electroluminescence from Combined Monomer and Excimer Emission
- 2022
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Ingår i: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 14:13, s. 15478-15493
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Tidskriftsartikel (refereegranskat)abstract
- Luminescent carbene-metal-amide complexes bearing group 11 metals (Cu, Ag, Au) have recently attracted great attention due to their exceptional emission efficiency and high radiative decay rates (k(r)). These materials provide a less costly alternative to organic light-emitting diode (OLED) emitters based on more scarce metals, such as Ir and Pt. Herein, a series of eight Cu(I) complexes bearing as yet unexplored 1,3-thiazoline carbenes have been investigated and analyzed with respect to their light emission properties and OLED application. For the first time among the class of copper-based organometallic compounds the formation of efficient electroluminescent excimers is demonstrated. The prevalence of electroluminescence (EL) from either the monomer (bluish green) or the excimer (orange-red) can be adjusted in vacuum-deposited emissive layers by altering the extent of steric encumbrance of the emitter or its concentration. Optimized conditions in terms of the emitter structure and mass fraction allowed a simultaneous EL from the monomer and excimer, which laid the basis for a preparation of a single-emitter white OLED (WOLED) with external quantum efficiency of 16.5% and a maximum luminance of over 40000 cd m(-2). Wide overlapping emission bands of the monomer and excimer ensure a device color rendering index (CRI) of above 80. In such a way the prospects of copper complexes as cost-effective materials for lighting devices are demonstrated, offering expense reduction through a cheaper emissive component and a simplified device architecture.
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