排序方式: 共有95条查询结果,搜索用时 15 毫秒
51.
Malinauskas T Tomkute-Luksiene D Daskeviciene M Jankauskas V Juska G Gaidelis V Arlauskas K Getautis V 《Chemical communications (Cambridge, England)》2011,47(27):7770-7772
Star-shaped charge transporting materials with a triphenylamine core and a varying number of diphenylethenyl sidearms, obtained using a one step synthesis procedure from commercially available and relatively inexpensive starting materials and possessing comparatively high hole drift mobility (up to 0.017 cm(2) V(-1) s(-1)), are reported. 相似文献
52.
Tadas MalinauskasMaryte Daskeviciene Karolis Kazlauskas Hai-Ching SuJuozas Vidas Grazulevicius Saulius JursenasChung-Chih Wu Vytautas Getautis 《Tetrahedron》2011,67(10):1852-1861
Multifunctional phosphorescent bis-cyclometallated iridium(III) complexes based on the 2-phenyl-1,2,3-benzotriazole moiety and bearing branched hole-transporting carbazole fragments were synthesized. The isolated compounds were found to be amorphous and expressed very good solubility. Introduction of flexible aliphatic chains of various lengths into the iridium complexes enabled manipulation of their glass transition temperature. The iridium complexes exhibited red phosphorescence emission at 650 nm with the lifetime of 5.7 μs and phosphorescence quantum yields of 0.22 and 0.17 in solution and solid state, respectively, at room temperature. The shielding effect of the carbazolyl moieties on the concentration quenching of phosphorescence of the iridium centers was found to result in the increased excited state lifetime and quantum yield due to the suppressed exciton migration. Non-optimized OLED devices, based on the phosphorescent bis-cyclometallated iridium(III) complex without host material were fabricated and their electroluminescence properties were evaluated. 相似文献
53.
Rita Vaickelionienė Vytautas Mickevičius Gema Mikulskienė Maryna Stasevych Olena Komarovska-Porokhnyavets Volodymyr Novikov 《Research on Chemical Intermediates》2011,37(8):1009-1027
N′-(4-Oxo-1,4-dihydronaphthalen-1-ylidene)-1-phenyl-5-oxopyrrolidine-3-carbohydrazides and N′-(3-methyl-4-oxo-1,4-dihydronaphthalen-1-ylidene)-1-phenyl-5-oxopyrrolidine-3-carbohydrazides were synthesized by reactions
of 5-oxo-1-phenylpyrrolidine-3-carbohydrazides with 1,4-naphthoquinone or 2-methyl-1,4-naphthoquinone. The alkylated analogues
of the above products were obtained using ethyl iodide. The interaction of 5-oxo-1-phenylpyrrolidine-3-carbohydrazides with
2,3-dichloro-1,4-naphthoquinone was followed by formation of N′-(3-chloro-1,4-dioxo-1,4-dihydronaphthalen-2-yl)-1-phenyl-5-oxopyrrolidine-3-carbohydrazides. All these compounds were characterized
using 1H, 13C NMR, IR and mass spectra. Some of the new compounds were tested for the antimicrobial and antifungal activity. 相似文献
54.
Vytautas Paškūnas 《Publications Mathématiques de L'IHéS》2013,118(1):1-191
We prove a conjecture of Colmez concerning the reduction modulo p of invariant lattices in irreducible admissible unitary p-adic Banach space representations of GL2(Q ?? p ) with p≥5. This enables us to restate nicely the p-adic local Langlands correspondence for GL2(Q ?? p ) and deduce a conjecture of Breuil on irreducible admissible unitary completions of locally algebraic representations. 相似文献
55.
Simona Urnikaite Dr. Tadas Malinauskas Dr. Valentas Gaidelis Dr. Vygintas Jankauskas Prof. Vytautas Getautis 《化学:亚洲杂志》2012,7(3):614-620
Fullerene–hydrazone dyads have been synthesized using the Confalone reaction followed by condensation with phenylhydrazines. Room‐temperature xerographic time‐of‐flight, ionization potential, and cyclic voltammetry measurements indicate that these narrow‐band‐gap (Eg<1.5 eV), ambipolar charge‐transporting dyads with balanced hole‐ and electron mobilities, which operate in air, are attractive materials for various optoelectronic applications. 相似文献
56.
Vytautas Grivickas Karolis Gulbinas Vladimir Gavryushin Vitalijus Bikbajevas Olga V. Korolik Alexander V. Mazanik Alexander K. Fedotov 《固体物理学:研究快报》2014,8(7):639-642
We reveal the intrinsic band‐to‐band photoluminescence (PL) in Tl‐based anisotropic semiconductors by means of confocal spectroscopy. The PL achieves largest value for k ⊥ c , where c is the layers stacking axis, and is dependent on polarization. In TlGaSe2, the band edge absorption spectra were determined at different excitation geometry by using techniques of depth‐resolved free‐carrier absorption (FCA) and photoacoustic response (PAR). A strong absorption enhancement is detected in a large spectral area in the near‐surface region lateral to ab plane. The band‐to‐band absorption enhancement is the most probable cause for high PL intensity. The near‐surface behavior, different from the bulk, might implement useful photonic functionality at room temperature (RT). (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
57.
Rizzi Andrea Jensen Travis Slochower David R. Aldeghi Matteo Gapsys Vytautas Ntekoumes Dimitris Bosisio Stefano Papadourakis Michail Henriksen Niel M. de Groot Bert L. Cournia Zoe Dickson Alex Michel Julien Gilson Michael K. Shirts Michael R. Mobley David L. Chodera John D. 《Journal of computer-aided molecular design》2020,34(5):601-633
Journal of Computer-Aided Molecular Design - Approaches for computing small molecule binding free energies based on molecular simulations are now regularly being employed by academic and industry... 相似文献
58.
Ruta Lazauskaite Maryte Daskeviciene Vytautas Getautis Juozas V. Grazulevicius 《Monatshefte für Chemie / Chemical Monthly》2009,10(2):565-571
Abstract
Photoinitiated cationic polymerizations of various epoxy monomers bearing a carbazole moiety, 9-[3-(allyloxy)-2-(oxiran-2-ylmethoxy)propyl]-9H-carbazole, 9-[3-methoxy-2-(oxiran-2-ylmethoxy)propyl]-9H-carbazole, 9-[2-(oxiran-2-ylmethoxy)ethyl]-9H-carbazole, as well as a composition of 3,6-dibromo-9-(oxiran-2-ylmethyl)-9H-carbazole with 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate were investigated in bulk using triphenyl carbenium salts having anions such as BF4 −, SnCl5 −, and SbCl6 −. Dark polymerizations of the carbazolyl monomers in the presence of the initiators are studied. These photoinduced polymerization reactions give oligomers of degree of polymerization 4-22. The effect of the anion of the photoinitiator and polymerization time on the polymerization reaction is discussed. 相似文献59.
Balevicius V Balevicius VJ Aidas K Fuess H 《The journal of physical chemistry. B》2007,111(10):2523-2532
The temperature dependencies of NMR shifts in the critical region of two coexisting phases have been simulated using statistical thermodynamics and graph-theory consideration of equilibrium processes of molecular association. Microparameters of magnetic screening of various water and water/pyridine structures used in the statistical averaging have been evaluated by density functional theory calculations (PBE1PBE and B3PW91 functionals in the 6-311++G** basis set). The gauge-including atomic orbital (GIAO) approach has been applied to ensure gauge invariance of the results. Solvent effects were taken into account by a polarized continuum model (PCM). NMR shifts "order parameters" (Deltadelta = |delta+ - delta-|) and "diameters" (phidelta = |(delta+ + delta-)/2 - deltaC|, where delta+, delta-, and deltaC are the chemical shifts of coexisting phases and at the critical point respectively) have been calculated in each case close to the lower critical solution point (TL) and processed using linear regression analysis of Deltadelta approximately |T - TL| and phidelta approximately |T - TL| in the log-log plot. It has been shown that the critical index beta can be evaluated with high precision from the slope of Deltadelta = f(T - TL) at any realistic set of model input parameters. The slope of diameter has been found to depend on both input beta and alpha values. The obtained phidelta slopes (0.58-0.63) are very close to 2beta values. The results are discussed within the concept of complete scaling. Results of simulation are compared and supported by experimental NMR data for water/2,6-lutidine, acetic anhydride/n-heptane, and acetic anhydride/cyclohexane systems. 相似文献
60.
Madhu Nagaraj Zahra Najarzadeh Jonathan Pansieri Henrik Biverstl Greta Musteikyte Vytautas Smirnovas Steve Matthews Cecilia Emanuelsson Janne Johansson Joel N. Buxbaum Ludmilla Morozova-Roche Daniel E. Otzen 《Chemical science》2022,13(2):536
Unlike misfolding in neurodegenerative diseases, aggregation of functional amyloids involved in bacterial biofilm, e.g. CsgA (E. coli) and FapC (Pseudomonas), is carefully regulated. However, it is unclear whether functional aggregation is inhibited by chaperones targeting pathological misfolding and if so by what mechanism. Here we analyze how four entirely different human chaperones or protein modulators (transthyretin, S100A9, Bri2 BRICHOS and DNAJB6) and bacterial CsgC affect CsgA and FapC fibrillation. CsgA is more susceptible to inhibition than FapC and the chaperones vary considerably in the efficiency of their inhibition. However, mechanistic analysis reveals that all predominantly target primary nucleation rather than elongation or secondary nucleation, while stoichiometric considerations suggest that DNAJB6 and CsgC target nuclei rather than monomers. Inhibition efficiency broadly scales with the chaperones'' affinity for monomeric CsgA and FapC. The chaperones tend to target the most aggregation-prone regions of CsgA, but do not display such tendencies towards the more complex FapC sequence. Importantly, the most efficient inhibitors (Bri2 BRICHOS and DNAJB6) significantly reduce bacterial biofilm formation. This commonality of chaperone action may reflect the simplicity of functional amyloid formation, driven largely by primary nucleation, as well as the ability of non-bacterial chaperones to deploy their proteostatic capacities across biological kingdoms.Unlike misfolding in neurodegenerative diseases, aggregation of functional amyloids involved in bacterial biofilm, e.g. CsgA (E. coli) and FapC (Pseudomonas), is carefully regulated. 相似文献