Cucurbiturils-Based Supramolecular Host-Guest Complexes: Singe-Crystal
Structures and Fluorescence Enhancement
Two supramolecular complexes were prepared using cucurbiturils [CBs]
as hosts and a four-armed p-xylene derivative (M1) as a guest molecule.
The single crystals of these two complexes were obtained and
successfully analyzed by single-crystal X-ray diffraction (SCXRD). An
unexpected and intriguing 1:2 self-assembly arrangement between the M1
and CB was notably uncovered, marking its first-time observation.
These host-guest complexes exhibit distinctive photophysical properties,
especially emission behaviors. The invaluable insights derived from
these precious single-crystal structures provide both precise structural
information regarding the supramolecular complexes and a deeper
understanding of the intricate mechanisms governing their photophysical