12-MC-4 metallacrowns as versatile tools for SMM research

- High-spin ground state in 12-MC-4 by heterometallic magnetic director approach.
- First cobalt metallacrowns of salicylhydroxamic acid.
- Cobalt 12-MC-4 metallacrowns as versatile SMMs based on a single Co(II) ion.
- Engineering of SMM features of cobalt metallacrowns via flexible scaffold.
- Click chemistry for linkage of azide-functionalized mononuclear SMMs to 12-MC-4.