Highly Fluorescent Supramolecular Nanoring Composed of Bent-Shaped Cyanostilbene Derivatives and Cucurbit[8]urils.

Supramolecular organic frameworks (SOFs) made of organic guest molecule and cucurbit[8]uril (CB[8]) in aqueous solution have great potential for diverse applications. Herein, we designed highly fluorescent zero-dimensional (0D) nano-ring SOF with CB[8] as a host and novel bent-shaped cyanostilbene guest. This host-guest complex successfully formed macrocyclic hexamer and showed significantly enhanced fluorescence (Φ =68 %) compared to non-assembled monomer (Φ =2 %). Unlike other SOFs, this 0D SOF could be dispersed uniformly without bundling phenomenon in water.