Detection of salbutamol and enantioselective sensing of L/D-lysine based on a cadmium-based coordination polymer

In this work, a one-dimensional zigzag chain coordination polymer, {[Cd(pbca)(2)]& BULL;2C(2)H(5)OH}(n) (1), was synthesised using the 2-(pyridin-2-yl)-1H-benzoimidazole-5-carboxylic acid (Hpbca) ligand and transition metal salts in a water/ethanol solvent system. Compound 1 further forms a three-dimensional supramolecular structure through hydrogen-bonding interactions. The fluorescence probe properties showed that the activated solvent-free sample of compound 1 (denoted as 1a) can be used to quantitatively identify salbutamol, and also it could distinguish l/d-lysine by different fluorescence responses, the detection limits of salbutamol and l-lysine were 1.22 x 10(-7) M and 1.44 x 10(-7) M, respectively. It was found that compound 1a had excellent anti-interference properties and recyclability for the detection of the above substances. Meanwhile, the fluorescence response mechanisms of compound 1a for different analytes were elucidated through characterization using FT-IR, PXRD, and DFT calculations and the Benesi-Hildebrand equation. This study not only provides a viable sensor for the sensitive and selective detection of salbutamol in simulated urine samples but also provides a promising strategy for achieving the fluorescence identification of chiral amino acids by using achiral coordination polymers.