A Novel Fluorescent 1,10‐Phenanthroline‐2,9‐dicarboxaldehyde‐ 2,5‐diaminoterephthalicacid‐Schiff Base Polymer for Cu²⁺ Detection

Abstract

A novel fluorescent Schiff base polymer (PTDA-DATA-SBP) is synthesized by amine aldehyde condensation reaction between 1,10-phenanthroline-2,9-dicarboxaldehyde (PTDA) and 2,5-diaminoterephthalicacid (DATA) as a selective fluorescent probe for Cu 2 + detection. The as-prepared PTDA-DATA-SBP displayed irregular nanospheres with a diameter of about 5 μm. Under the excitation of 338 nm, the PTDA-DATA-SBP had a characteristic emission peak at 565 nm. The PTDA groups in PTDA-DATA-SBP could coordinate with Cu 2 + under help of carboxyl groups of DATA. Owing to the photoinduced electron transfer mechanism, the fluorescence of PTDA-DATA-SBP was weak-ened after the addition of Cu 2 + in the presence of common ions. Hence, the PTDA-DATA-SBP was exploited as a fluorescent nanosensor for sensing Cu 2 + . The PTDA-DATA-SBP showed high selectivity and fast response towards Cu 2 + even in presence of other relevant metal ions. The PTDA-DATA-SBP fluorescent sensor has a good linear range of 3.45 nM-8.00 μM, and the limit of detection was as low as 1.15 nM. The proposed PTDA-DATA-SBP sensor could also detect Cu 2 + in actual samples. The work not only provided a good fluorescent probe for Cu 2 + detection but also provided a feasible strategy to construct highly selective fluorescent probes.