Oligonuclear carboxylate-brigded transition metal complexes as a) heteronuclear coordination compounds, b) coordination compounds with redox non-innocent ligands, c) complexes with additional organometallic capping groups
Zusammenfassung der Projektergebnisse
We could show that our approach to obtain high spin ground state spin clusters by disturbing the symmetry of multinuclear clusters work out for two different routes. First, we showed that we obtain homometallic oligonuclear complexes with S ≠ 0 by using organic molecules that function as good chelating ligands but are forced to bridge between transition metal ions due to steric constraints. Secondly, we showed that by changing from homometallic to heterometallic oligonuclear compounds we can obtain complexes with high spin ground states, although the dominating exchange interaction is still antiferromagnetic, as it was in the starting materials where this leads to diamagnetic ground states. The principles we worked out are crucial to our understanding of the magnetic properties of much larger clusters and to a rational access to specific molecules with high spin ground states, a necessary condition for future applications. Our next steps will be to combine both approaches.
