نتایج جستجو برای: zwitterion
تعداد نتایج: 484 فیلتر نتایج به سال:
The present work provides the explicit reaction pathways of (chlorosulfonyl)(trifluoromethanesulfonyl)imide in presence tertiary amines, as well several zwitterion compounds great interest for battery use.
The title compound, C(17)H(16)N(4)O(6), is a Schiff base, which is found as a bis-zwitterion in the solid state. The geometry around the iminium N atom indicates sp(2)-hybridization. The diiminiumpropyl-ene chain is in an approximate double-gauche conformation, with average N-C-C-C torsion angles of 69.3°. The zwitterion shows strong intra-molecular N-H⋯O hydrogen bonds between the iminium N an...
The development of chemically and mechanically stable nanocomposite membranes with high permeability self-cleaning properties is important for various wastewater treatment applications. Two-dimensional MXene (Ti3C2Tx) nanomaterials have attracted increasing research interest in applications, including membrane-based separation technologies treatment. Zwitterion functionalization has been widely...
Dissociation kinetics for loss of a water molecule from hydrated ions of lithiated valine, alanine ethyl ester and betaine are determined using blackbody infrared radiative dissociation at temperatures between -60 and 110 degrees C. From master equation modeling of these data, values of the threshold dissociation energy are obtained for clusters containing one through three water molecules. By ...
The ability of phosphonium cations to act as intracellular transport vectors is well-established. Phosphonioalkylthiosulfate zwitterions, and ω-thioacetylalkylphosphonium salts, which act as 'masked thiolate' ligands, are useful precursors for the formation of phosphonium-functionalised gold nanoparticles, enabling the nanoparticles to be transported into cells for diagnostic and therapeutic pu...
The retention mechanism of electrostatic ion chromatography (EIC) is currently under debate and is the focus of this paper. A comprehensive set of retention data has been obtained on a C18 column coated with the zwitterionic surfactant 3-(N,N-dimethylmyristylammonio)propanesulfonate used with a range of mobile phases in which both the mobile-phase anion and cation have been varied systematicall...
Over the past few decades, enantioselective phosphine organocatalysis has evolved rapidly into a highly efficient catalytic strategy for a range of useful reactions. However, as restricted by the traditional catalytic modes, some important reactions, such as asymmetric Strecker-type reactions, have thus far been out of reach of this strategy. Reported herein is an application of enantioselectiv...
The title Schiff base, C(11)H(14)ClNO(4), originally refined as a neutral mol-ecule [Chumakov, Antosyak, Mazus, Tsapkov & Samus (2000), Crystallogr. Rep.45, 945-950], is inter-preted as a zwitterionic compound. There are two independent zwitterions in the asymmetric unit. Five of the six hydr-oxy groups of the -CH(2)OH fragments are disordered. In one zwitterion, two are disordered over three s...
The fertility (positive ultrasound scanning 60-75 days after insemination) of ram spermatozoa frozen in Tris- or zwitterion/glucose/egg yolk/glycerol-based diluents was examined during the natural breeding season (autumn). In Experiment 1 Tris-citrate, high glucose and Hepes-NaOH diluents were used and ewes (n = 266) were inseminated (induced oestrus) with 20 (uterus) or 180 (cervix) million mo...
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