Recyclable Luminescence Sensor for Dinotefuran in Water by Stable Cadmium–Organic Framework

Due to the widespread use of dinotefuran
around the world, its
impact on food and environmental safety has aroused great concern,
and the establishment of a rapid and convenient approach for dinotefuran
detection is necessary but challenging. Herein, we synthesized a unique
three-dimensional framework {[(CH3)2NH2]2[Cd3(BCP)2]·10H2O·3.5DMF}n (1). Single-crystal X-ray
analysis indicates that 1 possesses a 4,8-connected anion
framework that corresponds to alb topology, with
a one-dimensional rectangular channel along the c-axis with the size of 4 Å × 10 Å. Compound 1 displays satisfactory solvent and thermal stability. Luminescent
investigations reveal that 1 can selectively detect dinotefuran
by fluorescence quenching among other pesticides, displaying excellent
anti-interference performance with common ions in water. Importantly,
the limit of detection is as low as 2.09 ppm, which is far below the
residual concentration of the U.S. food standard. A fluorescence quenching
mechanism study shows that there exists competitive energy absorption
and static quenching processes. To our knowledge, 1 is
the first MOF-based fluorescence probe for dinotefuran detection.