| Autor: |
DeGayner JA; Department of Chemistry , Northwestern University , Evanston , Illinois 60208-3313 , United States., Wang K; Department of Chemistry , Northwestern University , Evanston , Illinois 60208-3313 , United States., Harris TD; Department of Chemistry , Northwestern University , Evanston , Illinois 60208-3313 , United States. |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of the American Chemical Society [J Am Chem Soc] 2018 May 30; Vol. 140 (21), pp. 6550-6553. Date of Electronic Publication: 2018 May 17. |
| DOI: |
10.1021/jacs.8b03949 |
| Abstrakt: |
We report the synthesis of a semiquinoid-bridged single-chain magnet, as generated through a thermally induced metal-ligand electron transfer. Reaction of FeCl 3 with 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone (LH 2 ) in the presence of (NMe 4 )Cl gave the compound (NMe 4 ) 2 [LFeCl 2 ]. Together, variable-temperature X-ray diffraction, Mössbauer spectra, Raman spectra, and dc magnetic susceptibility reveal a transition from a chain containing (L 2- )Fe II units to one with (L 3-• )Fe III upon decreasing temperature, with a transition temperature of T 1/2 = 213 K. The dc magnetic susceptibility measurements show strong metal-radical coupling within the chain, with a coupling constant of J = -81 cm -1 , and ac susceptibility data reveal slow magnetic relaxation, with a relaxation barrier of Δ τ = 55(1) cm -1 . To our knowledge, this compound provides the first example of a semiquinoid-bridged single-chain magnet. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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