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1.
Vytautas Getautis Albina Stanisauskaite Tadas Malinauskas Jolanta Stumbraite Valentas Gaidelis Vygintas Jankauskas 《Monatshefte für Chemie / Chemical Monthly》2006,23(12):1401-1409
Hydrazones containing 1-phenyl-1,2,3,4-tetrahydroquinoline units were synthesized starting from diphenylamine. These compounds
were found to constitute novel hole transporting materials and were characterized by the time of flight method. The hole drift
mobility in these compounds exceeds 10−6 cm2 V−1 s−1 at an electric field of 106 V cm−1. 相似文献
2.
G. Mekuskiene M. M. Burbuliene V. Jakubkiene E. Udrenaite P. Gaidelis P. Vainilavicius 《Chemistry of Heterocyclic Compounds》2003,39(10):1364-1368
5-(4,6-Diphenyl-2-pyrimidinyl)-1,3,4-oxadiazole-2-thione reacted with haloalkanes or their derivatives containing side chain oxo group to give S-alkylated compounds. Aminomethylation and acylation of the thione yielded N(3)-derivatives. Treatment of the title compound with hydrazine hydrate in butanol resulted in 4-amino-5-(4,6-diphenyl-2-pyrimidinyl)-1,2,4-triazole-3-thione via a recyclization reaction. Reaction of the title compound with hydrazine hydrate or phenylhydrazine in dioxane led to formation of the corresponding thiocarbohydrazides. The latter in the presence of a base were cyclized to 4-amino-1,2,4-triazole-3-thiones. 相似文献
3.
Dr. Tadas Malinauskas Dr. Maryte Daskeviciene Dr. Giedre Bubniene Ieva Petrikyte Steponas Raisys Dr. Karolis Kazlauskas Dr. Valentas Gaidelis Dr. Vygintas Jankauskas Dr. Robertas Maldzius Prof. Saulius Jursenas Prof. Vytautas Getautis 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(44):15044-15056
Star‐shaped charge‐transporting materials with a triphenylamine (TPA) core and various phenylethenyl side arm(s) were obtained in a one‐step synthetic procedure from commercially available and relatively inexpensive starting materials. Crystallinity, glass‐transition temperature, size of the π‐conjugated system, energy levels, and the way molecules pack in the solid state can be significantly influenced by variation of the structure of these side arm(s). An increase in the number of phenylethenyl side arms was found to hinder intramolecular motions of the TPA core, and thereby provide significant enhancement of the fluorescence quantum yield of the TPA derivatives in solution. On the other hand, a larger number of side arms facilitated exciton migration through the dense side‐arm network formed in the solid state and, thus, considerably reduces fluorescence efficiency by migration‐assisted nonradiative relaxation. This dense network enables charges to move more rapidly through the hole‐transport material layer, which results in very good charge drift mobility (μ up to 0.017 cm2 V ?1 s?1). 相似文献
4.
The Erd?s‐Pósa theorem (1965) states that in each graph G which contains at most k disjoint cycles, there is a ‘blocking’ set B of at most f(k) vertices such that the graph G – B is acyclic. Robertson and Seymour (1986) give an extension concerning any minor‐closed class of graphs, as long as does not contain all planar graphs: in each graph G which contains at most k disjoint excluded minors for , there is a set B of at most g(k) vertices such that G – B is in . In an earlier paper (Kurauskas and McDiarmid, Combin, Probab Comput 20 (2011) 763–775), we showed that, amongst all graphs on vertex set which contain at most k disjoint cycles, all but an exponentially small proportion contain a blocking set of just k vertices. In the present paper we build on the previous work, and give an extension concerning any minor‐closed graph class with 2‐connected excluded minors, as long as does not contain all fans (here a ‘fan’ is a graph consisting of a path together with a vertex joined to each vertex on the path). We show that amongst all graphs G on which contain at most k disjoint excluded minors for , all but an exponentially small proportion contain a set B of k vertices such that G – B is in . (This is not the case when contains all fans.) For a random graph Rn sampled uniformly from the graphs on with at most k disjoint excluded minors for , we consider also vertex degrees and the uniqueness of small blockers, the clique number and chromatic number, and the probability of being connected. © 2012 Wiley Periodicals, Inc. Random Struct. Alg., 44, 240‐268, 2014 相似文献
5.
Batch pressure vessels commonly used for hydrothermal liquefaction have typical heating times in the range of 30 to 60 min.
Thermodynamically, the complex set of reactions are path dependent, so that the heating rate can possibly affect yields and
the composition of the resultant liquid products. It is postulated that the mode of heat transfer becomes an uncontrolled
variable in kinetic studies and can seriously impact scale-up. To confirm this hypothesis and minimize these heat-transfer-related
artifacts, we designed a batch pressure vessel equipped with an induction heating system, which allows the reduction of heat-up
times by about two orders of magnitude to several seconds, compared to tens of minutes with standard pressure reactors. This
system was used to study the direct liquefaction of corn stover and aspen wood with a pretreatment. The heating rate was found
to have no significant effect on the composition of the liquid products. However, the liquid yields are dependent on the heating
rate. Varying the cooling rate does not show obvious effects. The results confirm that the heating rate, as governed by the
mode of heat transfer, is an important factor that needs to be considered during scale-up. 相似文献
6.
R. Brazis A. Namjnas V. Gaidelis A. Mironas L. Safonova S. Bumeliene 《International Journal of Infrared and Millimeter Waves》1994,15(3):519-524
Tunable backward-wave oscillators (BWO) equipped with computer aided control and data processing means are applied for liquid (e.g. mineral oil) and solid (Si, GaAs, YBaCuO) sample spectrometry in the frequency range above 200 GHz. 相似文献
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8.
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
9.
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
10.
Marta Reig Cristian Gozálvez Dr. Vygintas Jankauskas Dr. Valentas Gaidelis Dr. Juozas V. Grazulevicius Dr. Lluís Fajarí Dr. Luis Juliá Dr. Dolores Velasco 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(51):18551-18558
A series of neutral long‐lived purely organic radicals based on the stable [4‐(N‐carbazolyl)‐2,6‐dichlorophenyl]bis(2,4,6‐trichlorophenyl)methyl radical adduct (Cbz‐TTM) is reported herein. All compounds exhibit ambipolar charge‐transport properties under ambient conditions owing to their radical character. High electron and hole mobilities up to 10?2 and 10?3 cm2 V?1 s?1, respectively, were achieved. Xerographic single‐layered photoreceptors were fabricated from the radicals studied herein, exhibiting good xerographic photosensitivity across the visible spectrum. 相似文献