AMOS-E

Abstract A homopolymer of N,N-bis(vinyloxyethyl)thiuramdisulphide was synthesized via cationic polymerization and investigated as a sorbent of the ions of mercury and precious metals. The effect of the nature and concentration of acid, phase contact time on the extraction of metals was revealed; sorption capacities of the polymer and metal partition coefficients were estimated. It was shown that the sorbent exhibits high sorption activity to metal ions in the cationic form: with respect to mercury (Hg 2+ ) from 1 M HNO 3 solution 1100 mg/g, 1M H 2 SO 4 990 mg/g, 1 M HCl 280 mg/g; with respect to silver (Ag + ) from 1 M HNO 3 850 mg/g, from 1 M H 2 SO 4 900 mg/g. A mechanism of the interaction of active groups of the sorbent with metal ions was proposed on the basis of IR spectroscopic data. The homopolymer of N,Nbis(vinyloxyethyl)thiuramdisulphide sorbs mercury and silver ions selectively from a mixture of copper, nickel, iron and zinc salts. The possibility to use the sorbent for concentrating precious metals and for an alytical purposes was demonstrated. A method of sorbent regeneration was developed

The effect of the oxophilic Tb(III) cation on C-ON bond homolysis in alkoxyamines

WOS:000430904400002Recently, we reported on the activation of the C-ON bond homolysis in alkoxyamines R1R2NOR3 using the coordination of the alkyl fragment R-3 with metal cations Cu(II) and Zn(II). Here, we report the selective coordination of the diethylphosphoryl group carried by the nitroxyl fragment by the oxophilic metal cation Tb(III). Coordination on the nitroxyl fragment afford a slight 2-fold decrease in the C-ON bond homolysis rate constant kd. (C) 2018 Elsevier B.V. All rights reserved

Platform for High-Spin Molecules: A Verdazyl-Nitronyl Nitroxide Triradical with Quartet Ground State

Quartet verdazyl-nitronylnitroxide triradical was synthesized via palladium-catalyzed cross-coupling reaction of the corresponding diiodoverdazyls with a nitronyl nitroxide-2-ide gold(I) complex. The triradical is air-stable and possess good thermal stability with decomposition onset at ∼160 °C in an inert atmosphere. X-ray diffraction analysis of single crystals confirmed the presence of verdazyl and nitroxide radical centers. Magnetic properties were characterized by a SQUID magnetometry of polycrystalline powders and by EPR spectroscopy in different matrices. Collected data analyzed using of the high-level quantum chemical calculations confirmed that the triradical has high-spin ground states.<br /