A dual‐function Cd‐based coordination polymer for the detection of moxifloxacin and SiO₃²⁻ ions

Abstract

A 1D coordination polymer (CP) [Cd2L2(H2O)4]·3H2O (1) was prepared by solvothermal method using 1‐(4‐carboxyphenyl)‐1H‐pyrazole‐3‐carboxylic acid (H2L) as single ligand. Fluorescence sensing experiments show that 1 has dual‐function specific recognition ability for moxifloxacin (MXF) and silicate (SiO32‐), which can be used as the turn‐off sensing material for their detection. When 1 specifically identifies MXF, the Ksv is as high as 6.46 × 105 M‐1 (6‐20 μM) and the limit of detection (LOD) is as low as 14 nM. 1 is the second example of a CP‐based fluorescent probe for the detection of MXF, which has confirmed that the Ksv is the largest to date for the detection of MXF, with a detection sensitivity increase of more than three times. For SiO32‐ ions detection, the fluorescence intensity ratio has a good linear correlation with the concentration of SiO32‐ ions in the concentration range of 0‐100 μM, with a slope of 1.33 × 104 M‐1, and the LOD is as low as 0.68 μM. According to the reported literature, 1 is the only example of SiO32‐ ions sensing by CP‐based fluorescence sensor so far. In order to better understand the sensing phenomenon, we also discussed the sensing mechanism for MXF and SiO32‐ ions.