Four coordination polymers luminescent materials for selectively detection of Fe3+/Cr2O72−/nitrobenzene in solution phase

Fe 3+ , Cr 2 O 7 2− and nitrobenzene play an indispensable role in the field of life environment, industrial and agricultural production. However, their abnormal presence in the environment will seriously affect the ecological balance and human health. Therefore, it is very important to construct a simple, rapid, sensitive and effective Fe 3+ , Cr 2 O 7 2− and nitrobenzene probe. Herein, Cd(TDPA)(TIB)] n (1), [Zn 3 (TDPA) 3 (TIB) 2 (H 2 O)] n (2), {[Cd(TDPA)(TPA)]·(H 2 O)} n (3), and {[Cd(TDPA) 0.5 (Cl)(TPA)]·(H 2 O)} n (4) with a high stability and strong fluorescence were fabricated (H 2 TDPA ​= ​3,3′-Thiodipropionic acid, TPA ​= ​Tris[4-(imidazole-lyl)pheny]amine, TIB ​= ​1,3,5-tris(1- imidazolyl)benzene). CP-1 shows a 2D structure, and CPs 2–4 presents a unique and novel 3D structure features. Further, CPs 1–4 as fluorescent probe exhibits distinguished performance for Fe 3+ , Cr 2 O 7 2− and nitrobenzene detection, and which not subjects to environmental interference and have high selectivity and accuracy. The excellent quenching percentage and detection limits are approximate to or exceed the permissible limits allowed by the USEPA, which proves its practical application value in the environment systems. Taking advantages of flexible carboxylic acids and triangular containing nitrogen ligands to design and synthetic four novel CPS with ideal stability and strong fluorescence properties. We demonstrate herein how to exploit the advantages of CPS, and develop a series of fluorescence sensing probe materials with excellent selectivity, sensitivity and quenching rates to identify Fe 3+ /Cr 2 O 7 2− /nitrobenzene in aqueous solutions. • Design and construction of four novel Zn/Cd-CPs employ flexible carboxylic acid and triangular rigid nitrogen ligands. • Novel Zn/Cd-CPs with ideal stability and strong fluorescence properties can be suitable as fluorescence sensing probe materials. • Four Zn/Cd-CPs sensors showed excellent selectivity, sensitivity quenching rate, and successfully applied for monitoring Fe 3+ /Cr 2 O 7 2− /nitrobenzene in sewage samples.