π-Stacking Stopper-Macrocycle Stabilized Dynamically Interlocked [2]Rotaxanes.

The synthesis of mechanically interlocked molecules is valuable due to their unique topologies. With π-stacking intercomponent interaction, e.g.

Selective detection of sulfide in human lung cancer cells with a blue-fluorescent "ON-OFF-ON" benzimidazole-based chemosensor ensemble.

A completely water-soluble, high quantum yield blue-fluorescent benzimidazole derivative (AQ), containing a rigid benzimidazole-thiophene structure, was synthesized. Among 21 metal ions, the fluorescence of AQ was selectively turned off by Cu to form an AQ-Cu ensemble. Thereafter, the fluorescence of the AQ-Cu ensemble was turned on by sulfide (S) with high selectivity and sensitivity in pure water solution.

Highly selective detection of Pd ion in aqueous solutions with rhodamine-based colorimetric and fluorescent chemosensors.

In this study, we report a new class of rhodamine-based fluorescent sensors for highly selective and sensitive detection of Pd ions in aqueous medium. A rhodamine-based palladium sensor RPS and a coumarin-rhodamine Förster resonance energy transfer (FRET)-pair based palladium sensor FPS were synthesized with the designed podand ligand for Pd ion recognition. They showed both colorimetric change and fluorometric change in the presence of Pd ion due to the opening of their spirolactam rings.