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Phosphonate Ligands Stabilize Mixed‐Valent {Mn III 20− x Mn II x } Clusters with Large Spin and Coercivity
Author(s) -
Maheswaran Shanmugam,
Chastanet Guillaume,
Teat Simon J.,
Mallah Talal,
Sessoli Roberta,
Wernsdorfer Wolfgang,
Winpenny Richard E. P.
Publication year - 2005
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200501265
Subject(s) - crystallography , phosphonate , magnetization , manganese , coercivity , single molecule magnet , chemistry , ground state , coordination sphere , spin (aerodynamics) , condensed matter physics , materials science , physics , crystal structure , atomic physics , magnetic field , thermodynamics , organic chemistry , quantum mechanics
In a spin : The mixed‐valent {Mn III 20− x Mn II x } 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.