Reversibly Tunable White-Light Emissions of Styrylpyridiniums with Cucurbiturils in Aqueous Solution.

The different excimer emissions based on a series of host-guest complexes of dipolar dyes styrylpyridiniums (An and Bn) with cucurbit[n]urils (CB[n]) are reported. The syn- and anti- excimers due to the opposite stacking orientations have been well investigated both in experiments and DFT calculations. Furthermore, reversibly color-tunable luminescent supramolecular assemblies including near white-light emission with CIE coordinates (0.32, 0.29) were achieved by competitive inclusion of An-CB[7] with ADA.