Effect of secondary bis-pyridine-bis-amide ligand on the construction of Zn-based coordination polymers and the enhancement of ultrasensitive luminescent sensing properties

The design of luminescent coordination polymers (LCPs) as sensors for the detection of molecules and ions constitutes an active area of research. Through the introduction of a secondary bis-pyridine-bis-amide ligand, two 3D unique LCPs [Zn(H 2 bpta)] ( 1 ) and [Zn(3-bpcha)(bpta) 0.5 ]·H 2 O ( 2 ), where 3-bpcha denotes N , N′ -bis(3-pyridyl)cycloheximide and H 4 bpta represents 2,2′,4,4′-biphenyltetracarboxylic acid, were successfully synthesized via the hydrothermal method. Both of these LCPs were characterized by single-crystal X-ray diffraction, FT-IR, and powder X-ray diffraction patterns, which reveal that these LCPs possess two different 3D frameworks. Furthermore, a series of luminescence recognition tests proved that 1 and 2 can act as potential sensing materials for the detection of Fe 3+ ions and nitro compounds in aqueous environments. (I) Two 3D unique LCPs were successfully synthesized via the hydrothermal method. (II) The effect of secondary ligand on LCPs had been investigated in detail. (III) The detection limits of Fe 3+ ion were 10 3 ​ μ M for LCP 1 and 10 ​μM for LCP 2. (IV) The detection limits of NB were found to be 10 3 ​ μ M for 1 and 10 ​μM for 2. (V) LCPs can act as fluorescent sensors for Fe 3+ ions and nitro compounds. Two Zn-based LCPs have been synthesized and characterized, which display remarkable luminescent sensing properties The LCPs can be served as outstanding candidates in the selective sensing of Fe 3+ , NB and NM under low detection limits.