The paper shows aspects of applicability of carbamates and optimizes the conditions for amperometric titration of antimony with a solution of lead diethyldithiocarbamate with two platinum indicator electrodes in media having different acid-base properties relative to the current of anodic oxidation of reagent and cathodic reduction of titrated metal ions. During experiment, the metrological characteristics (reproducibility, correctness, band extension of determined contents, sensitivity, selectivity) were improved, the fields of use of the antimony titration method were expanded with a view to their subsequent application when controlling the composition of natural objects and industrial materials.
The article studies the voltammetric behavior of 4-methoxyphenyl carboxymethyl diethyldithiocarbamate (MPCMDEDTC) in dimethyl sulfoxide (DMSOn the presence of background electrolytes with different acid-base properties in the anodic polarization region of a platinum microdisk electrode. MPCMDEDTC is oxidizied in 0.125 M LiClO 4 solution forming one clearly pronounced anode wave with E1 /2 = 0.85 V, while the wave height varies in proportion to the concentration of the depolarizer. A procedure has been developed of amperometric titration of mercury (II) with a standard MPCMDEDTC solution in DMSO using two indicator electrodes.
Synthesis of high viscosity, ecofriendly, and low melting point poly(ionic liquid)s (LMP-PIL) with network structure has been introduced by the reaction of TAIm[I] ionic liquid monomer with disodium salts of various open-chain carboxylic acids as well as sulfonic acids via a polycondensation on counter ions (PC-CI). Changes in methylene group numbers of carboxylate, as well as sulfonate, provide a broad spectrum of properties in terms of viscosity, density, and solubility for the resulting PILs. The physical properties of the PILs including, viscosity, melting point, boiling point, density, M¯n , and DPI, were determined in this study. The ecofriendly PILs served as an efficient solvent and ligand for the Cu-catalyzed Heck and Sonogashira C-C coupling reactions. High to excellent yields were obtained for various coupling products under mild conditions at MP of the PILs. The prepared PILs could be recycled several times from the homogenous reaction mixture with preservation of the intrinsic properties. Also, a deep study was conducted on the mechanism of the coupling reactions.
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