caa a22 4500 463219554 CHVBK 20180405153208.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1134/S1061934807030057 doi (NATIONALLICENCE)springer-10.1134/S1061934807030057 Study of the chemical mechanism of color reactions of selenium(IV) with o -arylenediamines [Elektronische Daten] [Yu. Dedkov, A. Musatov] o-Arylenediamines are promising for the photometric determination of selenium. The search for new reagents of this group is desirable. To obtain information necessary for this purpose, the chemical mechanism of color reactions of selenium(IV) with o-arylenediamines was studied. The optimum conditions of these reactions and the spectrophotometric characteristics of reagents and complexes were found. The ratio of components in the reaction products (piazoselenols) of 1: 1 was determined by elemental analysis, NMR spectroscopy, and the isomolar series method. The formation of the selenium-nitrogen bond was confirmed and the quasiaromatic character of piazoselenols was revealed by IR and NMR spectroscopy. Binding energies of valence orbitals, electron density distribution, and charges of nitrogen and selenium atoms were estimated by x-ray photoelectron spectroscopy. In the case of piazoselenol from 1,2-phenylenediamine, the existence of two tautomeric forms with the oxidation numbers of selenium close to +2 and +4 were found. Piazoselenol based on N-phenyl-1,2-phenylenediamine predominantly occurs as a single compound with the oxidation number of selenium close to +2. The most probable structures of the resulting piazoselenols were proposed, and the probable schemes of the reactions of selenium(IV) with 1,2-phenylenediamine and N-phenyl-1,2-phenylenediamine were justified. Pleiades Publishing, Ltd., 2007 Dedkov Yu Moscow State Regional University, ul. Radio 10a, 105005, Moscow, Russia aut Musatov A. Moscow State Regional University, ul. Radio 10a, 105005, Moscow, Russia aut Journal of Analytical Chemistry Nauka/Interperiodica 62/3(2007-03-01), 225-232 1061-9348 62:3<225 2007 62 10809 https://doi.org/10.1134/S1061934807030057 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061934807030057 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dedkov Yu Moscow State Regional University, ul. Radio 10a, 105005, Moscow, Russia aut NATIONALLICENCE 700 1- Musatov A. Moscow State Regional University, ul. Radio 10a, 105005, Moscow, Russia aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/3(2007-03-01), 225-232 1061-9348 62:3<225 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer