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 2-position on the central pyrimidine group of the ligand L.
@article{arxiv.cond-mat/0606422,
title = {Supramolecular Co(II)-[2 x 2] grids: Metamagnetic behavior in a single molecule},
author = {O. Waldmann and M. Ruben and U. Ziener and P. Müller and J. M. Lehn},
journal= {arXiv preprint arXiv:cond-mat/0606422},
year = {2007}
}
Comments
19 douple-spaced pages, 5 figures, to appear in Inorg. Chem