Published in Russian Chemical Bulletin
A heteroatomic analog of 1,1,2,3,3-pentamethylenepropane, the diradical N-[bis(4,4,5,5-tetramethyl-3-oxide-1-oxyl-4,5-dihydro-1H-imidazol-2-yl)methylene]-2-methylpropane-2-amine oxide (1) with two C(sp2)-bonded nitronyl nitroxide fragments in magnetically concentrated (single crystal) and magnetically diluted (frozen solution) forms was studied by ...
Published in Russian Chemical Bulletin
Under UV-A light and anaerobic conditions, the photodegradation of kynurenic acid and tryptophan significantly decreases with an increase in the viscosity of the medium without significant changes in the composition of the formed products. The recombination products of tryptophan radicals (covalently linked dimeric forms) exhibit the most pronounce...
Published in Russian Chemical Bulletin
The temperature dependence of the degenerate electron exchange (DEE) between the guanosine-5′-monophosphate cation and its short-lived radical dication in an aqueous solution was studied by the chemically induced dynamic nuclear polarization (CIDNP) method with the microsecond time resolution. Based on the simulation of the CIDNP kinetic data, the ...
Published in Russian Chemical Bulletin
Glycyrrhizic acid (GA) is the active ingredient in licorice root, which exhibits a wide range of biological activities, including anti-inflammatory and antiviral activities. In particular, the virus-inhibiting effect of GA on SARS-associated coronavirus was demonstrated. In addition, GA was found to be capable of increasing bioaccessibility of othe...
Published in Russian Chemical Bulletin
The review is focused on the key achievements in the development of the synthetic approaches to the tris(tetrathiaaryl)methyl radicals. The properties and promising applications of these radicals are also considered.
Published in Russian Chemical Bulletin
New compounds with the rosiaite type structure LaM1/3Sb5/3O6, M = Co, Ni, and Cu, were synthesized. The compounds belong to quasi-two-dimensional magnets, in which magnetic interactions occur in the layers with a honeycomb structure. It is shown that there is no long-range magnetic order in these compounds. The temperature and field dependences of ...
Published in Russian Chemical Bulletin
1,3,5-Tris(2-diphenylphosphoryl-4-ethylphenoxymethyl)benzene (L′), a phosphorylcontaining tripodand, was synthesized for the first time in order to find extraction systems for efficient recovery of lanthanides. The main regularities of extraction of lanthanide(III) ions with mixtures of L′ and 4-benzoyl-5-methyl-2-phenyl-3-pyrazolone (HL) into CHCl...
Published in Russian Chemical Bulletin
A computational modeling (DFT UTPSSh/6-311++G(d,p)) of the electronic structures, energy characteristics, and magnetic properties of mononuclear iron complexes with tris-(2-pyridylmethyl)amine bases and dioxolenes bearing stable radicals (nitronyl nitroxyl, verdazyl, and dithiadiazolyl) was performed. Paramagnetism of all spin states of the molecul...
Published in Russian Chemical Bulletin
The parahydrogen-induced polarization technique allows one to significantly enhance the NMR signal. Novel results on the parahydrogen-induced polarization of C2—C3 hydrocarbons using metal complexes are presented. Gaseous propane with the nuclear spin polarization level of at least 0.8% can be produced by bubbling parahydrogen through a solution of...
Published in Russian Chemical Bulletin
Based on the previous experimental and theoretical studies of the unusual dome-shaped structures of Pd II and NiII 3,5-di(tert-butyl)-2-oxyazobenzene complexes, gas-phase quantum chemical calculations were performed for related model CuII, CoII, FeII, MnII, CrII, and ZnII complexes. The calculations were carried out with full geometry optimization ...
