Molecular design and structural pecularities of the 3- and 4-pyridylboron-capped tris-glyoximate and tris-dichloroglyoximate iron(II) clathrochelates with apical donor groups

Zelinskii, G.E.; Belov, A.S.; Vologzhanina, A.V.; Limarev, I.P.; Dorovatovskii, P.V.; Zubavichus, Y.V.; Lebed, E.G.; Voloshin, Y.Z.; Dedov, A.G.

Авторы: Zelinskii Genrikh E., Belov Alexander S., Vologzhanina Anna V., Limarev Ilya P., Dorovatovskii Pavel V., Zubavichus Yan V., Lebed Ekaterina G., Voloshin Yan Z., Dedov Alexey G.
Журнал: Polyhedron
Том: 160
Год издания: 2019
Издательство: Pergamon Press
Местоположение издательства: United States
Первая страница: 108
Последняя страница: 114
DOI: 10.1016/j.poly.2018.12.031
Аннотация: Tris-glyoximate and tris-dichloroglyoximate iron(II) clathrochelates with apical pyridyl groups were obtained through one-pot template condensation of the corresponding α-dioxime with 3- or 4-pyridylboronic acids on the iron(II) ion as a matrix under vigorous reaction conditions using the boiling CF3COOH as a solvent. The initially formed mixtures of mono- and diprotonated clathrochelate species were converted into the target macrobicyclic intracomplexes under basic conditions. These complexes were characterized using elemental analysis, MALDI-TOF mass spectrometry, IR, UV–Vis, 1H and 13C NMR spectroscopies, and by single crystal X-ray diffraction as well. In their molecules, the encapsulated iron(II) ion is situated in the center of its FeN6-coordination polyhedron. The geometry of all the FeN6-coordination polyhedra is intermediate between a trigonal prism and a trigonal antiprism with the average distortion angles φ from 16.7 to 17.7°. Their heights h fall from 2.36 to 2.38 Å and the averaged bite angles α vary in a narrow range 78.2–78.4°. Characteristic feature of the 3- and 4-pyridylboron-capped glyoximate clathrochelate molecules, as compared with their aliphatic and aromatic analogs, is shortening of the chelate CC bonds from 1.45 to 1.42 Å. Comparison of the values of a ligand aspect ratio for the obtained new pyridyl-terminated iron(II) clathrochelates with those for their known aliphatic tris-dioximate analogs was performed.
Добавил в систему: Лимарев Илья Павлович

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Molecular design and structural pecularities of the 3- and 4-pyridylboron-capped tris-glyoximate and tris-dichloroglyoximate iron(II) clathrochelates with apical donor groupsстатья

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