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Abstract <p>New cobalt(II) complex [Co(L)<sub>2</sub>](ClO<sub>4</sub>)<sub>2</sub> is synthesized by the reaction of 2,6-bis(pyrazol-3-yl)pyridine (L) containing capable of deprotonating hydroxy groups with cobalt(II) perchlorate hexahydrate in deuterated methanol in a tube for NMR spectroscopy. A possibility of the new complex to undergo in situ reversible deprotonation under the action of 1,8-diazabicyclo[5.4.0]undec-7-ene is demonstrated. As found by the approach based on an analysis of changing chemical shifts in the <sup>1</sup>H NMR spectra with temperature, the synthesized complex exists in the high-spin state both before and after complete deprotonation in a temperature range of 200–325 K. The X-ray diffraction (XRD) data of the completely deprotonated complex [Co(L-2H)<sub>2</sub>](DBU+H)<sub>2</sub> (CIF file CCDC no. 2448321) indicate that the high-spin state of the complex is retained in the crystal as well.</p>

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Spin State of the pH-Sensitive Cobalt(II) Complex with the Bis(pyrazol-3-yl)pyridine-Based Ligand

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • E. S. Safiullina,
  • I. A. Nikovskiy,
  • Yu. V. Nelyubina

摘要

Abstract

New cobalt(II) complex [Co(L)2](ClO4)2 is synthesized by the reaction of 2,6-bis(pyrazol-3-yl)pyridine (L) containing capable of deprotonating hydroxy groups with cobalt(II) perchlorate hexahydrate in deuterated methanol in a tube for NMR spectroscopy. A possibility of the new complex to undergo in situ reversible deprotonation under the action of 1,8-diazabicyclo[5.4.0]undec-7-ene is demonstrated. As found by the approach based on an analysis of changing chemical shifts in the 1H NMR spectra with temperature, the synthesized complex exists in the high-spin state both before and after complete deprotonation in a temperature range of 200–325 K. The X-ray diffraction (XRD) data of the completely deprotonated complex [Co(L-2H)2](DBU+H)2 (CIF file CCDC no. 2448321) indicate that the high-spin state of the complex is retained in the crystal as well.