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Two Cd–Ln coordination polymers (CPs), with the open-chain ether Schiff base bis(5-bromine-3-methoxysalicylidene)-3-oxapentane-1,5-diamine (H 2 L), {[CdLnL(OAc)(NO 3 )(CH 3 OH)(isonicotinate)]·(3CH 2 Cl 2 )} n  (Ln = Gd ( 1 ) and Er ( 2 )), have been synthesized by the interfacial diffusion method. The structure analysis reveals that both CPs  1  and  2  are infinite one-dimensional zigzag coordination polymers, which are formed by isonicotinate bridging CdLnL cluster units. The fluorescence properties of H 2 L,  1  and  2  in the solid-state were studied. Compared with the free H 2 L, the fluorescence peaks of the two Cd–Ln CPs have undergone a significant blue shift (about 80 nm) and enhancement. This is due to the increased rigidity of the ligand after coordination of the metal ions with the ligand, which reduces the energy loss of thermal vibration. The fluorescence enhancement of  1  is greater than that of  2 , which may be caused by the lanthanide contraction. Moreover, the results of experiments  in vitro  indicate that H 2 L,  1  and  2  have good ability to scavenge superoxide radical and that  1  and  2  are higher than free H 2 L, where their IC 50  value is in the range 12.5–21.4 μM.

journal of coordination chemistry

Structures, fluorescence, and superoxide radical scavenging activities of two cd–Ln (Ln = Gd, Er) coordination polymers with an open-chain ether Schiff base and isonicotinate