| Autor: |
Britton E; School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K., Ansell RJ; School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K., Howard MJ; School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K., Hardie MJ; School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K. |
| Abstrakt: |
New photoswitchable pyridyl-azo-phenyl-decorated tripodal host ligands (L az ) that belong to the cyclotriveratrylene family have been synthesized, and their photoswitching behavior and crystal structures determined. The latter includes a remarkable 7-fold Borromean-weave entanglement of π-π stacked layers. Trigonal bipyramidal {[Pd(en)] 3 (L az ) 2 } 6+ metallo-cryptophanes (en = ethylenediamine) were formed from these and a previously known pyridyl-azo-phenyl-decorated tripodal host ligand. These coordination cages dissociate at low concentrations and are less robust to photoswitching of the L az ligands than were previously reported Ir(III)-linked metallo-cryptophanes with similar ligands, reflecting the greater lability of the Pd-N bonds. The {[Pd(en)] 3 (L az ) 2 } 6+ cages all act as hosts, binding octyl sulfate anions, or N -[2-(dimethylamino)ethyl]-1,8-naphthalimide in a dimethyl sulfoxide solution. |
