Single-Molecule Magnetic Behavior in a Neutral Terbium(III) Complex of a Picolinate-Based Nitronyl Nitroxide Free Radical

The terdentate anionic picolinate-based nitronyl nitroxide (picNN) free radical forms neutral and robust homoleptic complexes with rare earth-metal ions. The nonacoordinated Tb3+ complex Tb(picNN)3·6H2O is a single-molecule magnet with an activation energy barrier Δ = 22.8 ± 0.5 K and preexponential...

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Veröffentlicht in:	Inorganic chemistry 2011-08, Vol.50 (16), p.7370-7372
Hauptverfasser:	Coronado, Eugenio, Giménez-Saiz, Carlos, Recuenco, Alejandro, Tarazón, Ana, Romero, Francisco M, Camón, Agustín, Luis, Fernando
Format:	Artikel
Sprache:	eng
Schlagworte:	Free Radicals - chemistry Iron Chelating Agents - chemistry Magnetics Models, Molecular Molecular Structure Nitric Oxide Donors - chemistry Organometallic Compounds - chemistry Picolinic Acids - chemistry Terbium - chemistry
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Zusammenfassung:	The terdentate anionic picolinate-based nitronyl nitroxide (picNN) free radical forms neutral and robust homoleptic complexes with rare earth-metal ions. The nonacoordinated Tb3+ complex Tb(picNN)3·6H2O is a single-molecule magnet with an activation energy barrier Δ = 22.8 ± 0.5 K and preexponential factor τ0 = (5.5 ± 1.1) × 10–9 s. It shows magnetic hysteresis below 1 K.
ISSN:	0020-1669 1520-510X
DOI:	10.1021/ic2010425