Novel Cobalt Bis-o-semiquinonato Complexes with Bidentate N-Donor Ligands

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Abstract

Two new cobalt bis-o-semiquinonato complexes, (Pyz-Phen)Co(3,6-DBSQ)2 (I) and (Bpyz)Co(3,6-DBSQ)2 (II) (Pyz-Phen = pyrazino[2,3-f][1,10]phenanthroline, Bpyz = bipyrazine, 3,6-DBSQ = 3,6-di-tert-butyl-o-benzoquinone radical anion), were synthesized. According to X-ray diffraction data, both complexes have a trigonal-prismatic geometry of the inner coordination sphere. The distribution of C–O and Co–O bond lengths, which reflects the valence state of the metal and the ligands, indicates that the complexes are formed by cobalt(II) surrounded by two semiquinone radical anions. The results of magnetochemical measurements show that the pyrazino[2,3-f][1,10]phenanthroline complex is a derivative of low-spin divalent cobalt, whereas its bipyrazine structural analogue is a high-spin cobalt(II) derivative.

About the authors

A. A. Zolotukhin

Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Nizhny Novgorod, Russia

Email: aaz@iomc.ras.ru
Россия, Нижний Новгород

M. P. Bubnov

Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Nizhny Novgorod, Russia

Email: aaz@iomc.ras.ru
Россия, Нижний Новгород

R. V. Rumyantsev

Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Nizhny Novgorod, Russia

Email: aaz@iomc.ras.ru
Россия, Нижний Новгород

G. K. Fukin

Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Nizhny Novgorod, Russia

Email: aaz@iomc.ras.ru
Россия, Нижний Новгород

A. S. Bogomyakov

International Tomography Center, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

Email: aaz@iomc.ras.ru
Россия, Новосибирск

V. K. Cherkasov

Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Nizhny Novgorod, Russia

Author for correspondence.
Email: aaz@iomc.ras.ru
Россия, Нижний Новгород

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Copyright (c) 2023 А.А. Золотухин, М.П. Бубнов, Р.В. Румянцев, Г.К. Фукин, А.С. Богомяков, В.К. Черкасов