title: Supramolecular Co(II)-[2 x 2] grids: metamagnetic behavior in a single molecule.
abstract: The magnetic anisotropy of the supramolecular [2 x 2] grid [Co(II)4L4]8+, with a bis(bipyridyl)-pyrimidine-based ligand L, was investigated by single-crystal magnetization measurements at low temperatures. The magnetization curves exhibit metamagnetic-like behavior and are explained by the weak-exchange limit of a minimal spin Hamiltonian including Heisenberg exchange, easy-axis ligand fields, and the Zeeman term. It is also shown that the magnetic coupling strength can be varied by the substituent R1 in the two-position on the central pyrimidine group of the ligand L.
authors.affiliation: Physikalisches Institut III, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany. waldmann@iac.unibe.ch
authors.forename: Oliver
authors.initials: O
authors.lastname: Waldmann
authors.forename: Mario
authors.initials: M
authors.lastname: Ruben
authors.forename: Ulrich
authors.initials: U
authors.lastname: Ziener
authors.forename: Paul
authors.initials: P
authors.lastname: Müller
authors.forename: Jean M
authors.initials: JM
authors.lastname: Lehn