Journal
INORGANIC CHEMISTRY
Volume 59, Issue 11, Pages 7700-7709Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.0c00716
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Funding
- Russian Science Foundation [17-73-20369]
- Council for grants of the President of the Russian Federation for the state support of young Russian scientists [MD-1935.2020.3]
- Ministry of Science and Higher Education of the Russian Federation
- Russian Science Foundation [17-73-20369] Funding Source: Russian Science Foundation
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Here we report the first successful attempt to identify spin-crossover compounds in solutions of metal complexes produced by mixing different ligands and an appropriate metal salt by variable-temperature nuclear magnetic resonance (NMR) spectroscopy. Screening the spin state of a cobalt(II) ion in a series of thus obtained homoleptic and heteroleptic compounds of terpyridines (terpy) and 2,6-bis(pyrazol-3-yl)pyridines (3-bpp) by using this NMR-based approach, which only relies on the temperature behavior of chemical shifts, revealed the first cobalt(II) complexes with a 3-bpp ligand to undergo a thermally induced spin-crossover. A simple analysis of NMR spectra collected from mixtures of different compounds without their isolation or purification required by the current method of choice, the Evans technique, thus emerges as a powerful tool in a search for new spin-crossover compounds and their molecular design boosted by wide possibilities for chemical modifications in heteroleptic complexes.
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