J. Am. Chem. Soc., 128 (13), 4214 -4215, 2006. 10.1021/ja058626i S0002-7863(05)08626-9
Web Release Date: March 14, 2006

An S = 6 Cyanide-Bridged Octanuclear Fe^III₄Ni^II₄ Complex that Exhibits Slow Relaxation of the Magnetization

Dongfeng Li, Sean Parkin, Guangbin Wang, Gordon T. Yee, Rodolphe Clérac,* Wolfgang Wernsdorfer, and Stephen M. Holmes*

Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, Centre de Recherche Paul Pascal, UPR-CNRS 8641, 115 avenue du Dr. A. Schweitzer, 33600 Pessac, France, and Laboratoire Louis Néel, CNRS, BP-166, 38042 Grenoble Cedex 9, France

Received January 17, 2006

Abstract:

The synthesis and structural and magnetic characterization of an S = 6 cyanide-bridged octanuclear Fe^III₄Ni^II₄ (1) complex is described. Ac susceptibility and -SQUID measurements suggest that fast magnetization relaxation is present in zero-field due to quantum tunneling of the ground spin state (QTM) while application of small magnetic fields induces slow relaxation of the magnetization.