The mixed-valent {MnIII20−xMnIIx} cage complexes (x=2–6) have structures corresponding to a fragment of a cubic close-packed lattice (see picture, Mn large sphere, O small sphere). Magnetic studies show for the cage with x=2 that the ground state has a spin (S) of 19±1 in low field, which increases to about S=30 at higher fields. The cage is a “single molecule magnet” with a high energy barrier (43 K) to reorientation of the magnetization..
Phosfhonate ligands stabilize mixed-valent ((Mn20-xMnxII)-Mn-III} clusters with large spin and coercivity / S. MAHESWARAN; G. CHASTANET; S. J. TEAT; T. MALLAH; R. SESSOLI; W. WERNSDORFER; R. E. P. WINPENNY. - In: ANGEWANDTE CHEMIE. INTERNATIONAL EDITION. - ISSN 1433-7851. - STAMPA. - 44:(2005), pp. 5044-5048. [10.1002/anie.200501265]
Phosfhonate ligands stabilize mixed-valent ((Mn20-xMnxII)-Mn-III} clusters with large spin and coercivity
SESSOLI, ROBERTA;
2005
Abstract
The mixed-valent {MnIII20−xMnIIx} cage complexes (x=2–6) have structures corresponding to a fragment of a cubic close-packed lattice (see picture, Mn large sphere, O small sphere). Magnetic studies show for the cage with x=2 that the ground state has a spin (S) of 19±1 in low field, which increases to about S=30 at higher fields. The cage is a “single molecule magnet” with a high energy barrier (43 K) to reorientation of the magnetization..
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