Abstract
A luminescent coordination polymer with the overall formula {[Zn(tr2btd)(bpdc)]∙DMF}n (where tr2btd = 4,7-di(1H-1,2,4-triazol-1-yl)-2,1,3-benzothiadiazole; bpdc = 4,4′-biphenyldicarboxylate) was synthesized and characterized by single-crystal and powder X-ray diffraction, thermogravimetric, infrared spectroscopy, and elemental analyses. Luminescent properties of the obtained compound were studied in detail both in the solid state and as a suspension in N,N-dimethylacetamide (DMA). It was found that {[Zn(tr2btd)(bpdc)]∙DMF}n exhibits bright turquoise luminescence with excellent quantum efficiency and demonstrates turn-on fluorescence enhancement effect upon soaking in DMA Al3+ solution. Fluorescence titration experiments were carried out and the detection limit for Al3+ ions was calculated to be 120 nM, which is among the lowest reported values for similar materials. Moreover, compound demonstrated excellent selectivity and reusability, and the mechanism of the response is discussed. These results indicate that {[Zn(tr2btd)(bpdc)]∙DMF}n is a promising probe for sensitive fluorescent Al3+ detection.
Highlights
Detection of metal cations is an important task in a broad range of human activities.Their presence can cause interferences in materials processing, pose an environmental threat and danger to the public health
The tr2btd ligand was synthesized in a moderate yield by the reaction of Br2btd with 2
1H-1,2,4-triazole in a superbasic medium K3PO4–DMSO (Scheme 1), the pure product was Synthesis obtained by simple recrystallization, which presents an advantage compared to the pre2.1
Summary
Detection of metal cations is an important task in a broad range of human activities Their presence can cause interferences in materials processing, pose an environmental threat and danger to the public health. Due to its wide spread throughout general population’s lives, an extensive research into aluminum physicochemical characteristics in relation to its uptake, buildup, and systemic bioavailability has been carried out [6]. This metal was confirmed as potentially toxic to the skeletal and hematopoietic systems [7,8].
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