New Bis‐Acylhydrazone Supramolecular Gel and Its Application in Ultrasensitive Detection of Ni ² ⁺

Abstract Stimulus‐responsive supramolecular fluorescent materials have attracted considerable attention due to their exceptional properties. In this study, a bis‐acylhydrazone based supramolecular gelator ZQ was successfully synthesized through a simple Schiff base reaction. Notably, ZQ could self‐assemble into the supramolecular gel ZQ‐G in a binary DMSO/H 2 O solution with the MGC of 1.5 wt% and T gel of 98 °C. Moreover, ZQ‐G demonstrated remarkable selectivity and ultra‐sensitive sensing capabilities for Ni 2+ . The combining ratio of ZQ to Ni 2+ was found to be 1:2, with a detection limit of 5.230 × 10 −7 M and a binding constant of 6.66 × 10 9 M −1/2 . Additionally, a supramolecular fluorescent film derived from ZQ‐G was fabricated for the detection of Ni 2+ , demonstrating promising prospects for practical applications.