Design of a double-decker coordination cage revisited to make new cages and exemplify ligand isomerism

• Sagarika Samantray,
• Sreenivasulu Bandi and
• Dillip K. Chand

Beilstein J. Org. Chem. 2019, 15, 1129–1140, doi:10.3762/bjoc.15.109

• : anion binding; double-decker cage; ligand isomerism; macrocycles; palladium; self-assembly; supramolecular; Introduction Coordination-driven self-assembly is a convenient strategy for the construction of supramolecules of desired dimensions via simple synthetic procedures. Well-defined metal–ligand

• a Pd4L4-type triple-decker cage [25]. The Clever research group reported a system in which two units of a double-decker cage are interlocked [26]. In this context, we revisited our earlier design of Pd3L4-type cages to prepare a corresponding analogues cages using the new ligand L1 (that is a

• double-decker cage The trinuclear complex [(NO3)2@Pd3(L1)4](NO3)4 (4a) was prepared by mixing Pd(NO3)2 with ligand L1 at a 3:4 ratio (Scheme 3(i), also Scheme 1(iv)). Complexation of metal components like Pd(BF4)2, Pd(ClO4)2 or Pd(OTf)2 with L1 at a 3:4 ratio did not afford the analogous trinuclear