title: Humidity-induced magnetization and magnetic pole inversion in a cyano-bridged metal assembly.
abstract: In general, magnetic properties of bulk magnetic materials are independent of the humidity of the environment. To obtain a magnetic material that has humidity-sensitive characteristics, water vapour must penetrate the lattice and act on spin sites. Nanoporous materials composed of metal-assembled complexes may be expected to display some humidity response because materials in this category can show functionalities such as gas storage and molecular recognition. Here, we demonstrate humidity-induced reversible variations in the magnetic properties of cyano-bridged cobalt(II)-manganese(II)-chromium(III) metal assemblies. The observed magnetic humidity response is due to adsorption and desorption of a ligand water molecule on the cobalt ion, which changes cobalt (II) between a 6- and 4-fold coordination geometry and switches the magnetic interaction between ferromagnetic coupling and antiferromagnetic coupling.
authors.affiliation: Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. ohkoshi@light.u-tokyo.ac.jp
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Ohkoshi
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Arai
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Sato
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Hashimoto
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D003124:Colorimetry / Q000295:instrumentation / Q000379:methods*; D003432:Cross-Linking Reagents / Q000737:chemistry; D003486:Cyanides / Q000032:analysis / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006813:Humidity; D008280:Magnetics / Q000295:instrumentation*; D008422:Materials Testing / Q000379:methods*; D008670:Metals / Q000737:chemistry; D008968:Molecular Conformation; D014159:Transducers
chemical_list: D003432:Cross-Linking Reagents; D003486:Cyanides; D008670:Metals; D003035:Cobalt