Chiral luminescent lanthanide–organic
cages have many potential
applications in enantioselective recognition, sensing, and asymmetric
catalysis. However, due to the paucity of structures and their limited
cavities, host–guest chemistry with lanthanide–organic
cages has remained elusive so far. Herein, we report a guest-driven
self-assembly and chiral induction approach for the construction of
otherwise inaccessible Ln4L4-type (Ln = lanthanide
ions, i.e., EuIII, TbIII; L = ligand) tetrahedral
hosts. Single crystal analyses on a series of host–guest complexes
reveal remarkable guest-adaptive cavity breathing on the tetrahedral
cages, reflecting the advantage of the variation tolerance on coordination
geometry of the f-elements. Meanwhile, noncovalent confinement of
pyrene within the lanthanide cage not only leads to diminishment of
its excimer emission but also facilitates guest to host energy transfer,
opening up a new sensitization window for the lanthanide luminescence
on the cage. Moreover, stereoselective self-assembly of either Λ4- or Δ4- type Eu4L4 cages has been realized via chiral induction with R/S-BINOL or R/S-SPOL templates, as confirmed by NMR, circular dichroism (CD), and
circularly polarized luminescence (CPL) with high dissymmetry factors
(g
lum) up to ±0.125.