Intramolecular Antiferromagnetic Coupling in Supramolecular Grid Structures with Co2+ Metal Centers
-
Waldmann, Oliver; Hassmann, Jörg; M\", Paul; uller, ; Hanan, Garry S.; Volkmer, Dirk; Schubert, Ulrich S.; Lehn, Jean-Marie
- Abstract:
- The magnetization of novel supramolecular grid structures consisting of four bis(bipyridyl)-
pyrimidine ligands and four Co21 ions was measured. We provide evidence for an antiferromagnetic
coupling of the Co21 spins. Investigations of microcrystals, powders, and solutions with the
mean distance of the grids varying from 20 to 160 Å showed that the coupling is solely of
intramolecular origin and is not affected by long-range ordering. Thus, these grids form an almost
ideal quantum spin system of four spins. This is further supported by low-temperature field-sweep
measurements.
- Year:
- 1997
- Type of Publication:
- Article
- Journal:
- Physical Review Letters
- Volume:
- 78
- Pages:
- 3390 – 3393