排序方式: 共有24条查询结果,搜索用时 31 毫秒
1.
Yokraj Katre Minu Singh Ajaya Kumar Singh 《Journal of Dispersion Science and Technology》2013,34(6):903-912
The kinetics and mechanism of N-bromosuccinimide (NBS) oxidation of D-mannose in the absence and presence of cetyltrimethylammonium bromide (CTAB) in acidic media have been studied under the condition [D-mannose]T ? [NBS]T at 40°C. Under the kinetic conditions, both the slower uncatalyzed and faster catalyzed paths go on. Both the paths show the fractional and first order dependence on [D-mannose] and [NBS]T, respectively. The rate decreased with increase in acidity. Neither succinimide (NHS) nor Hg(II) influenced the reaction rate. Activation parameters of the reactions were determined by studying the reaction at different temperatures (30–50°C). The influence of salts on the reaction rate was also studied. CTAB accelerates the reactions and the observed effects have been explained by considering the hydrophobic and electrostatic interaction between the surfactants and reactants. In the reaction, approximately 1 mole of NBS oxidized one mole of D-mannose. A reaction scheme of the oxidation of D-mannose by NBS was found to be in consistent with the rate law and the reaction stoichiometry. 相似文献
2.
MXenes are recently developed two-dimensional layered materials composed of early transition metal carbides and/or nitrides that provide unique characteristics for biosensor applications. This review presents the recent progress made on the usage and applications of MXenes in the field of electrochemical biosensors, including microfluidic biosensors and wearable microfluidic biosensors, and highlights the challenges with possible solutions and future needs. The multilayered configuration and high conductivity make these materials as an immobilization matrix for the biomolecule immobilization with activity retention and to be explored in the fabrication of electrochemical sensors, respectively. First, how the MXene nanocomposite as an electrode modifier affects the sensing performance of the electrochemical biosensors based on enzymes, aptamer/DNA, and immunoassays is well described. Second, recent developments in MXene nanocomposites as wearable biosensing platforms for the biomolecule detection are highlighted. This review pointed out the future concerns and directions for the use of MXene nanocomposites to fabricate advanced electrochemical biosensors with high sensitivity and selectivity. Specifically, possibilities for developing microfluidic electrochemical sensors and wearable electrochemical microfluidic sensors with integrated biomolecule detection are emphasized. 相似文献
3.
Synthesis,characterization and antibacterial properties of Schiff bases and Schiff base metal complexes derived from 2,3-diamino- pyridine 总被引:1,自引:0,他引:1
New copper(II), zinc(II) and nickel(II) Schiff base complexes derived from 2,3-diaminopyridine (DAPY) and selected aldehydes, namely salicylaldehyde (SalH), 4-hydroxybenzaldehyde (4-OHBenz) and 4-nitrobenzaldehyde (4-NO2Benz), and one mixed Schiff base, DAPY-{4-OHBenz}{SalH} were prepared and characterized by a combination of elemental analyses, i.r. and n.m.r. spectra, and magnetic susceptibility measurements. The Schiff bases and some of the metal complexes display antibacterial properties. 相似文献
4.
In this article, the cascaded second-order nonlinear phase shifts induced in the signal wave are studied using the three-wave parametric interaction in a four-layered QPM leaky waveguide configuration in Z-cut LiNbO 3 . In this interaction, the pump-andsignal waves are guided modes and the idler is radiated into the substrate. We have analyzed the nonlinear phase shifts induced in the signal wave due to cascaded second-order effects, as a function of different waveguide parameters. These studies should find application in realizing practical all-optical signal processing devices. 相似文献
5.
Sujatha Asha Sasidharan Anjana Anns Maria Thomas Minu Elizabeth Thomas K. R. Rohit K. Keerthi Krishnan 《合成通讯》2019,49(2):256-265
In this study, we report a copper-catalyzed ligand-free Cadiot–Chodkiewicz coupling reaction. No additives or ligands are required for this Cu-catalyzed C(sp)–C(sp) coupling reaction of terminal alkynes with alkynyl halides. The low cost of copper catalyst, excellent yield of the products, suppression of side-products and mild reaction conditions are the major advantages of this protocol. 相似文献
6.
Yanong D. Wang Minu Dutia M. Brawner Floyd Amar S. Prashad Dan Berger Melissa Lin 《Tetrahedron》2009,65(1):57-61
A regio- and stereoselective synthesis of 7-(E)-alkenyl-4-amino-3-quinolinecarbonitriles via Pd-mediated coupling reactions was developed. The comparison and optimization of stereoselectivity of the Heck, Stille, and Suzuki reactions of 7-bromo or 7-triflate-3-quinolinecarbonitrile are described. Compound 7 and 10 were potent inhibitors of Src kinase and Raf/Mek activity, respectively. 相似文献
7.
Reactions of the new acyclic ligand DNBH with RuCl3 · 3H2O, followed by addition of a secondary ligand L (L = PPh3, 1,10-phenanthroline, 2,2-bipyridine, pyridine and 2,4-diaminotoluene), yield six binuclear metal complexes, TR1–TR6. Two different methods were employed: template and a two-step synthesis, both yielding the same complexes. DNBH and its metal complexes were characterised by a combination of spectroscopic, elemental and magnetic susceptibility data. Coordination was found to be through the carbonyl oxygen of amide and phenolic oxygen in the octahedral environment of the metal. DNBH and some of the metal complexes display antibacterial properties. 相似文献
8.
In this article, the cascaded second-order nonlinear phase shifts induced in the signal wave are studied using the three-wave parametric interaction in a four-layered QPM leaky waveguide configuration in Z-cut LiNbO 3 . In this interaction, the pump-andsignal waves are guided modes and the idler is radiated into the substrate. We have analyzed the nonlinear phase shifts induced in the signal wave due to cascaded second-order effects, as a function of different waveguide parameters. These studies should find application in realizing practical all-optical signal processing devices. 相似文献
9.
We have previously reported on a series of 4-anilino-6,7-dialkoxy-3-quinolinecarbonitriles as potent inhibitors of MEK1 kinase. Herein, we describe our synthetic efforts toward a series of 4-anilino-6-alkoxy-7-amino-3-quinolinecarbonitriles. In the course of this work, we were able to rapidly construct a library of 4-anilino-6-alkoxy-7-amino-3-quinolinecarbonitriles by simultaneous or sequential SN2 (displacement) reactions on the C-6 chloroalkoxy moiety and SNAr (addition/elimination) reactions at C-7 with nucleophilic amines. 相似文献
10.
Formation and Structural Characterization of Metal Complexes derived from Thiosalicylic Acid 下载免费PDF全文
Minu G. Bhowon Sabina Jhaumeer‐Laulloo Salma Moosun Lisa Humphreys Simon Coles Roshni Fowdram Evena Mungra 《无机化学与普通化学杂志》2017,643(18):1167-1172
The formation and structural aspects of some metal complexes of thiosalicylic acid (TSA) were studied. The μ‐bridging tetra‐coordinated Ru complex, [Ru(C6H4(CO2)(μ‐S)(H2O)]2 ( 1 ) was formed by hydrothermal reaction of TSA with RuCl3. The complexes [M(dtdb)(phen)(H2O)]n ( 2 – 4 ) (M = ZnII, CoII, NiII, dtdb = 2,2′‐dithiodibenzoate anion, phen = 1,10‐phenanthroline) were obtained by the slow diffusion technique and the in situ S–S bond formation was confirmed by elemental, spectral and X‐ray analysis. Reaction of TSA with CuCl2 and 2,2′‐bipyridine (bipy) under the slow diffusion technique yielded the dimer [Cu(tdb)(bipy)] ( 5 ) (tdb = thiodibenzoic acid), where the in situ generation of 2,2′‐thiodibenzoic acid was observed. 相似文献