Spin State of the Iron(II) and Cobalt(II) 2,6-Di(5-Amino-1H-Pyrazol-3-yl)pyridine Complexes in Solution and in Crystal View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-06-24

AUTHORS

A. A. Pavlov, I. A. Nikovskii, A. V. Polezhaev, D. Yu. Aleshin, E. K. Melnikova, Ya. A. Pankratova, Yu. V. Nelyubina

ABSTRACT

The cobalt(II) and iron(II) complexes with 2,6-di(5-amino-1H-pyrazol-3-yl)pyridine (L), CoL2(ClO4)2 (I) and FeL2(ClO4)2 (II), are synthesized by the template reaction, isolated in the individual form, and characterized by elemental analysis, NMR spectroscopy, and thermogravimetry. The structures of complexes I and II (including the iron(II) complex obtained as two new solvate forms (FeL2(ClO4)2 ∙ 2(C2H5)2O ∙ H3CN (IIa) and FeL2(ClO4)2 ∙ (C2H5)2O ∙ CH3CN ∙ 0.75H2O (IIb)) are confirmed by X-ray diffraction analysis. The data obtained in the crystal (by the X-ray diffraction method) and in solutions (using the proposed approach to an analysis of paramagnetic shifts in 1H NMR spectra) indicate that the metal ion in the complexes exists in the high-spin state (S = 3/2 for Co(II) and S = 2 for Fe(II)) and undergoes no temperature-induced spin transition in a range of 120–300 K. More... »

PAGES

402-410

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1070328419060046

DOI

http://dx.doi.org/10.1134/s1070328419060046

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