Supramolecular Co(II)-[2 x 2] grids: metamagnetic behavior in a single molecule.
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.
Waldmann
Oliver
O
Physikalisches Institut III, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany. waldmann@iac.unibe.ch
Ruben
Mario
M
Ziener
Ulrich
U
Müller
Paul
P
Lehn
Jean M
JM