Visual, On-Site, and Accurate Detection of Aspirin Based on a 1-D Cd₆Tb₄-Containing Coordination Polymer

A 1-D Cd₆Tb₄-containing coordination polymer (1) was constructed for the luminescence detection of aspirin (ASA). The enhancement of Tb(III) luminescence of 1 caused by ASA is described by I_545 nm = k × [ASA] + a, which can be used to determine the concentrations of ASA in CH₃CN, fetal calf serum (FCS), and the real drug with high sensitivity and selectivity. Prepared test strips of 1 are used to qualitatively check ASA through the color change to green, and the on-site quantitative analysis of ASA can be further achieved through smartphone scanning. The luminescence response time of 1 toward ASA is about 5 s, and the limits of detection (LODs) are from 0.16 to 0.62 μM (ppm level).