A Quaternary β-Cyclodextrin-Viologen Inclusion Complex with Fast Photochromism and Strong Fluorescence for UV Dosimetry and Information Encryption.
A quaternary inclusion complex (TPV3+@β-CD3) was successfully assembled by encapsulating a viologen analogue bearing three pyridinium groups (TPV·Cl3) into three β-cyclodextrin (β-CD) hosts, as confirmed by NMR spectroscopy, fluorescence spectroscopic titration, and ESI-MS. For comparison, a ternary inclusion complex (...