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51.
Dominika Jendrzejczyk-Handzlik Meryem Rechchach Wojciech Gierlotka Herbert Ipser Hans Flandorfer 《Thermochimica Acta》2011,512(1-2):217-224
Using two different types of high temperature drop calorimeters, partial and integral enthalpies of mixing of liquid alloys were determined in the ternary Cu–Sb–Sn system. The system was investigated along four sections at 1100 K. Experimental data were used to find ternary interaction parameters by applying the Redlich–Kister–Muggianu model for substitutional solutions, and a full set of parameters describing the concentration dependence of the enthalpy of mixing was derived. From these, the isoenthalpy curves were constructed for 1100 K. The entire system shows exothermic enthalpy of mixing at the given temperature. 相似文献
52.
Meryem Çamur Mustafa Bulut Ali R. Özkaya Mehmet Kandaz Nurettin Yaylı 《Transition Metal Chemistry》2007,32(5):642-648
A new vic-dioxime bearing coumarin functionality, N′1,N′2-Dihydroxy-N
1,N
2-bis(4-methyl-2-oxo-2H-chromen-7-yl)oxalimidamid (LH2), N,N-bis-[4-methylcoumarinyl]-diamino glyoxime (LH2), and its mono- and dinuclear complexes {copperII, cobaltII, nickelII and uranylII} have been reported. The fluorescence excitation and emission spectra of LH2 and its complexes with metal ions were examined. It was observed that fluorescence and excitation emission intensity of LH2 was quenched depending on complex formation with metal ions. The characterizations of all newly synthesized compounds were
made by elemental analysis, 1H-n.m.r, i.r., u.v.–vis., and l.c-m.s./m.s. data. Electrochemical behaviour of the ligand involving oxime and coumarine moieties,
and its complexes with NiII, CuII, CoII and UO
2
II
were investigated by cyclic voltammetry. The comparison of the electrochemical behaviour of the ligand with its complexes
enabled us to identify metal-, oxime- and coumarine-based signals. 相似文献
53.
Sevgi Kolayli Ozlem Tarhan Meryem Kara Rezzan Aliyazicioglu Murat Kucuk 《Chemistry of Natural Compounds》2011,47(3):347-351
The fatty acid profiles of frequently consumed oils and crops cultivated in Turkey were investigated in regard to omega fatty
acids. Analyses were carried out on commercially sold oils, sunflower, olive, and fish oils, and oils extracted from fatty
seeds of hazelnut, walnut, olive, sunflower, poppy, sesame, and pumpkin, and butter produced in Turkey. Hazelnut and olive
oils were found to be rich in omega-9 (oleic acid 18:1), walnut, poppy seed, sesame, and pumpkin seed were rich in omega-6
(linoleic acid 18:2), and butter was rich in short chain fatty acids and omega-9. Fish oil, from mackerel, was the richest
in omega-3 fatty acids and fatty acid diversity. There were some alterations between commercially sold oils and oils extracted
from seeds in regard to fatty acid percentages and variety. 相似文献
54.
ABSTRACTThe electrical resistivity of gold was experimentally measured at high pressures from 2 to 5?GPa and temperatures ~300?K above melting. The resistivity decreased as a function of pressure and increased as a function of temperature as expected. The temperature dependence of resistivity in the solid and liquid phases are comparable to 1?atm results. The observed melting temperatures at each pressure agree well with previous experimental and theoretical studies. The essential result of this study is that resistivity decreases along the pressure-dependent melting boundary, conflicting with a prediction of invariant behavior as reported in the literature. This result is discussed in terms of the interaction between s and d-bands as both pressure and temperature increase along the melting boundary. The thermal conductivity of gold was calculated from the measured electrical resistivity using the Wiedemann-Franz law. The temperature-induced effect on the thermal conductivity at high temperatures is as expected in both the solid and liquid phase while the pressure-effect shows some variability. 相似文献
55.
Gökçen Birlik Demirel Samet Coşkun Meryem Kalkan Tuncer Çaykara 《Macromolecular bioscience》2009,9(5):472-479
The design of a novel polymer‐modified overlayer composed of PPAPE and GPMS on a silicon wafer for immobilization of DNA molecules is described. After hydroxylation of Si(100) surfaces, GPMS molecules were self‐assembled onto these surfaces. PPAPE molecules were then covalently attached to the epoxy‐terminated surfaces. The incubation time and concentration of PPAPE was found to effect both layer thickness and water CA. The type of organic solvent and the pH were found to change the nature of the PPAPE‐modified surface for DNA immobilization. It is concluded that PPAPE‐modified surfaces show advantages for DNA immobilization by electrostatic interactions between DNA molecules and positively charged free amino groups of the PPAPE‐modified surfaces at the appropriate pH values.
56.
Our efforts toward the development of the synthesis of a novel type of receptor ligand and its tetrasubstituted phthalocyanines, 2,9,16,23-tetrakis(6-hydroxyhexylsulfanyl) phthalocyanine, M[Pc(S–C6H13OH)4] (M = Zn(II), Cu(II), Co(II)), bearing sulfur and oxygen donor atoms on the periphery together with hexyl moieties, have been carried out together with spectroscopic and electrochemical characterization. The newly synthesized functional phthalocyanines were soluble in MeOH, EtOH, THF, DMF, CNP (α-chloronapthalene), DMSO and quinoline, and less soluble in i-PrOH and CH3CN. Cation binding abilities of the functional phthalocyanines with Ag+, Pd2+, Hg2+ and Cd2+, resulting in the formation of polynuclear phthalocyanine complexes, were evaluated by UV–Vis spectroscopic techniques. The spectroscopic properties of the complexes were affected strongly by the electron-donating sulfanyl units on the periphery. The cyclic voltammetry of the complexes were examined on a platinum electrode in DMSO. The new synthesized compounds have been characterized by elemental analysis, FTIR, 1H and 13C NMR, MS (ESI and MALDI-TOF) and UV–Vis spectral data. 相似文献
57.
A new supported reagent for the parallel synthesis of primary and secondary O-alkyl hydroxylamines through a base-catalyzed Mitsunobu reaction 总被引:1,自引:0,他引:1
The growing field of applications of O-alkyl hydroxylamines in medicinal chemistry and chemical biology has motivated the search for a parallel synthesis. A solid-phase approach based on the alkylation by alcohols of a new supported N-hydroxyphthalimide reagent using a Mitsunobu reaction followed by methylaminolysis has been optimized. This study points out the importance of the linker and a specific base effect for the Mitsunobu reaction. A large variety of alcohols can be used to give with moderate to high yields diverse O-alkyl hydroxylamines in high purity. 相似文献
58.
Şukriye Çakmak Tuğba Aycan Hasan Yakan Aysel Veyisoğlu Hasan Tanak Meryem Evecen 《Acta Crystallographica. Section C, Structural Chemistry》2023,79(6):249-256
N-[(4-Fluorophenyl)sulfanyl]phthalimide (C14H8FNO2S, FP ) was synthesized and characterized using X-ray crystallography. It was then investigated via quantum chemical analysis using the density functional theory (DFT) approach, as well as spectrochemically using FT–IR and 1H and 13C NMR spectroscopy, and elemental analysis. The observed and stimulated spectra are in very good agreement for the DFT method. The in vitro antimicrobial activity of FP against three Gram-positive bacteria, three Gram-negative bacteria and two fungi were determined using the serial dilution method, and FP showed the highest antibacterial activity against E. coli, with a MIC of 128 µg ml−1. Druglikeness, ADME (absorption, distribution, metabolism and excretion) and toxicology studies were carried out to theoretically examine the drug properties of FP . 相似文献
59.
Stphanie Goumri Francis Lacassin Antoine Baceiredo Guy Bertrand 《Heteroatom Chemistry》1996,7(6):403-408
Tris(iminotriphenylphosphoranyl)phosphonium chloride 2 , tris(iminotriphenylphosphoranyl)phosphine 3 , bis(iminotriphenylphosphoranyl)dichlorosilane 4 , tris(iminotriphenylphosphoranyl)-chlorosilane 5 and -hydrogenosilane 6 have been prepared by reacting the iminotriphenylphosphorane 1 with trichlorophosphine or the corresponding chlorosilanes. A multinuclear NMR study of these compounds is presented. © 1996 John Wiley & Sons, Inc. 相似文献