A supramolecular polypseudorotaxane material based on novel pillar[5]arene for ultrasensitive Fe³⁺ reaction

In this study, a novel linear supramolecular polypseudorotaxane was synthesized using a pillar[5]arene derivative (CP5) as the host and bis-bromohexyl pillar[5]arene (DP5) as the guest, facilitated by host-guest interactions. Subsequently, these components self-assembled to create an AIE-active material (CPDP-G) through C-H⋯π interactions involving the pillar[5]arene groups. Notably, the CPDP-G fluorescence material exhibits an exceptionally sensitive response to Fe³⁺, with a detection limit of 0.543 nM. The fabricated CPDP-G film serves as a rudimentary kit for Fe³⁺ detection. Moreover, CPDP-G demonstrates robust stability under diverse conditions, including variations in temperature, exposure to KClO₄, AcOH, and tetrabutylammonium hydroxide, and ultrasonic treatment. Consequently, the innovative supramolecular polypseudorotaxane material CPDP-G holds promising potential for the ultrasensitive detection of Fe³⁺ ions.