Asymmetric Ring Opening in a Tetrazine-Based Ligand Affords a Tetranuclear Opto-Magnetic Ytterbium Complex.

Autor: Richardson P; Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada., Marin R; Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada., Zhang Y; Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada., Gabidullin B; Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada., Ovens J; Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada., Moilanen JO; Department of Chemistry, Nanoscience Centre, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland., Murugesu M; Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie Pvt., Ottawa, ON, K1N 6N5, Canada.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2021 Feb 01; Vol. 27 (7), pp. 2361-2370. Date of Electronic Publication: 2020 Dec 16.
DOI: 10.1002/chem.202003556
Abstrakt: We report the formation of a tetranuclear lanthanide cluster, [Yb 4 (bpzch) 2 (fod) 10 ] (1), which occurs from a serendipitous ring opening of the functionalised tetrazine bridging ligand, bpztz (3,6-dipyrazin-2-yl-1,2,4,5-tetrazine) upon reacting with Yb(fod) 3 (fod - =6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octandionate). Compound 1 was structurally elucidated via single-crystal X-ray crystallography and subsequently magnetically and spectroscopically characterised to analyse its magnetisation dynamics and its luminescence behaviour. Computational studies validate the observed M J energy levels attained by spectroscopy and provides a clearer picture of the slow relaxation of the magnetisation dynamics and relaxation pathways. These studies demonstrate that 1 acts as a single-molecule magnet (SMM) under an applied magnetic field in which the relaxation occurs via a combination of Raman, direct, and quantum tunnelling processes, a behaviour further rationalised analysing the luminescent properties. This marks the first lanthanide-containing molecule that forms by means of an asymmetric tetrazine decomposition.
(© 2020 Wiley-VCH GmbH.)
Databáze: MEDLINE
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