Three robust Zn(Ⅱ)-coordination polymers as dual-responsive chemosensors for efficient sensing of enrofloxacin and acetylacetone

Designing efficient and stable non-precious coordination polymers remains a challenge for the luminescent sensing of enrofloxacin and acetylacetone. Three Zn(Ⅱ)-coordination polymers with the formula {[Zn2(L)(BTC)(OH)]·H2O}n (1), [Zn1.5(L)(MIP)(OH)]n (2) and [Zn(L)(DBT)]n (3); L = 2-(2-Pyridin-3-yl-vinyl)-1H-benzimidazole, H3BTC = 1,3,5-benzene tricarboxylic acid, H2MIP = 5-methylisophthalic acid, and H2DBT = 2,5-dibromoterephthalic acid were hydrothermally synthesized and characterized. 1 reveals an unusual 3D topology, 2 displays a 3D mog framework, while 3 exhibits (4,5)-connected 3D xah framework. 1∼3 are firstly dual-functional luminescence sensors for detecting enrofloxacin and acetylacetone, expressing high selectivity and sensitivity. Quick and visual detection of enrofloxacin and acetylacetone without any pretreatment is realized by using CP 1∼3 paper-based sensors. Furthermore, the fluorescence sensing mechanism was discussed in detail.