Sourav Mondal, Nilanjan Dey
coordination through phosphate groups and electrostatic interactions. Notably, the dimeric zinc complex demonstrated a significantly stronger quenching effect compared to monomeric zinc complex, with a detection limit as low as 2.10 µM. In contrast, replacing zinc with iron resulted in a turn-off to turn-on response, attributed to demetallation of the iron complex upon PA addition, while the copper-based complex showed negligible interaction. Furthermore, the zinc complex with superior sensitivity was successfully applied for the quantification of PA in vegetable extracts such as carrot, soybean, and sesame seed, achieving excellent recovery rates between 97.2% and 115.2% with relative standard deviations (RSD) of 2-3.7%. Finally, a cellulose-based paper strip embedded with this zinc complex was fabricated for rapid, on-site PA detection.