Spin state behavior of a pH-responsive cobalt(II) complex with a bis(pyrazol-3-yl)pyridine ligand
- Authors: Safiullina E.S.1,2, Nikovskii I.A.1, Nelyubina Y.V.1
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Affiliations:
- Nesmeyanov Institute of Organoelement Compounds
- Topchiev Institute of Petrochemical Synthesis
- Issue: Vol 51, No 9 (2025)
- Pages: 590-600
- Section: Articles
- URL: https://ogarev-online.ru/0132-344X/article/view/309081
- DOI: https://doi.org/10.31857/S0132344X25090059
- EDN: https://elibrary.ru/lipapo
- ID: 309081
Cite item
Abstract
A new cobalt(II) complex [Co(L)2](ClO4)2 is synthesized by the reaction of 2,6-bis(pyrazol-3-yl)pyridine (L) containing deprotonable hydroxyl groups with cobalt(II) perchlorate hexahydrate in deuterated methanol in an NMR tube. The possibility of its reversible deprotonation under the action of 1,8-diazabicyclo[5.4.0]undec-7-ene in situ is demonstrated. Variable-temperature ¹H NMR studies (200–325 K) reveal that the complex maintains a high-spin state both before and after complete deprotonation. Single-crystal X-ray diffraction data of the fully deprotonated complex [Co(L-2H)2](DBU + H)2 (CCDC № 2448321) indicate that it also retains the high-spin state in the crystalline phase.
About the authors
E. S. Safiullina
Nesmeyanov Institute of Organoelement Compounds; Topchiev Institute of Petrochemical Synthesis
Email: yulia.v.nelyubina@gmail.com
Moscow, Russia; Moscow, Russia
I. A. Nikovskii
Nesmeyanov Institute of Organoelement Compounds
Author for correspondence.
Email: yulia.v.nelyubina@gmail.com
Moscow, Russia
Yu. V. Nelyubina
Nesmeyanov Institute of Organoelement Compounds
Email: yulia.v.nelyubina@gmail.com
Moscow, Russia
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