NMR Relaxation, Spectra, and Structure of Paramagnetic Complexes of 1,3-Diaryl-5-quinoxalylformazans in Solution | Sciact - CRIS-система Института катализа

NMR Relaxation, Spectra, and Structure of Paramagnetic Complexes of 1,3-Diaryl-5-quinoxalylformazans in Solution Научная публикация

Журнал

Journal of Structural Chemistry
ISSN: 0022-4766 , E-ISSN: 1573-8779

Вых. Данные

Год: 1990, Том: 31, Номер: 2, Страницы: 231-238 Страниц : 8 DOI: 10.1007/bf00752689

Ключевые слова

Relaxation Rate; Nickel Complex; Cobalt Complex; Paramagnetic Shift; Proton Relaxation Rate

Авторы

Kessenikh A.V. ¹ , Shmelev L.V. ¹ , Krol' I.A. ¹ , Stepanov A.G. ²

Организации

1	All-Union Scientific-Research Institute of Chemical Reagents and Ultrapure Chemical Substances
2	Institute of Catalysis, Academy of Sciences of the USSR, Siberian Branch

It has been established that the experimental values of the proton relaxation rates for paramagnetic complexes of nickel and cobalt of the type ML2 [HL = 1,3-diaryl-5-(3-chloro-2-quinoxalyl)formazans] are in good agreement with the values obtained from calculations based on x-ray diffraction data for the isostructural diamagnetic cadmium complex CdL2 under the assumption that the dipole-dipole interaction makes the predominant contribution to the rate of electron-nuclear relaxation of the nucleus under consideration, i.e., under the assumption that tau(1n)-1 approximately r-6, where tau(1n) is the relaxation time of the nucleus under consideration, and r is the distance from the metal cation (the unpaired electron) to that nucleus. The values of r in NiL2 calculated from the experimental values of tau(1n) differ from the analogous distances in CdL2 by +/- 7%.

Kessenikh A.V. , Shmelev L.V. , Krol' I.A. , Stepanov A.G.
NMR Relaxation, Spectra, and Structure of Paramagnetic Complexes of 1,3-Diaryl-5-quinoxalylformazans in Solution
Journal of Structural Chemistry. 1990. V.31. N2. P.231-238. DOI: 10.1007/bf00752689 WOS Scopus РИНЦ OpenAlex

Кессених А.В. , Шмелев Л.В. , Кроль И.А. , Степанов А.Г.
ЯМР-релаксация, спектры и структура парамагнитных комплексов 1,3-диарил-5-хиноксалилформазанов в растворе
Журнал структурной химии. 1990. Т.31. №2. С.57-64. РИНЦ CAPlusCA

Поступила в редакцию:	29 апр. 1988 г.
Опубликована в печати:	1 мар. 1990 г.

Web of science:	WOS:A1990HQ34600009
Scopus:	2-s2.0-34249953912
РИНЦ:	47574232
OpenAlex:	W2313355905

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