Phosphonate Ligands Stabilize Mixed‐Valent {Mn^III_{20−<i>x</i>}Mn^II_<i>x</i>} Clusters with Large Spin and Coercivity

Abstract

In a spin: 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. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z501265_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.