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Kolekcje
Inne
Spectroscopic and magnetic studies of erbium(III)-TEMPO complex as a potential single-molecule magnet : interplay of the crystal-field and exchange coupling effects.
Autorzy
Rok wydania
2016
Czasopismo
Numer woluminu
662
Strony
163-168
DOI
10.1016/j.cplett.2016.09.033
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Crystallographic, spectroscopic, and magnetic studies of three-center systems: lanthanoid-Ln3+ ions doubly-coordinated by TEMPO (2,2,6,6-tetramethylpiperidin-1-oxyl) radicals [Ln-TEMPO2] are reported. The temperature dependence of alternating-current magnetic susceptibility indicates the single-molecule-magnet behavior of Er-TEMPO2, exhibiting relatively slow magnetization relaxation. Well-resolved absorption spectra were obtained only for Er-TEMPO2. Other samples yielded spectra not amenable for meaningful interpretation. The crystal-field parameters (CFPs) determined from the measured Er3+-energy levels served as starting CFPs for fitting the direct-current magnetic susceptibility result. Compatibility of the so-determined and fine-tuned CFPs, and interplay between crystal-field-related effects and exchange-coupling effects are considered. Exchange couplings in Ln-TEMPO2 appear antiferromagnetic and unexpectedly large.
Słowa kluczowe
single-molecule magnets, Spectroscopic properties, magnetic susceptibility, absorption spectra, Crystal-field parameters, Exchange coupling constants, Ln-TEMPO complexes
Adres publiczny
http://dx.doi.org/10.1016/j.cplett.2016.09.033
Strona internetowa wydawcy
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