Abstract
Two different alkaline earth metal coordination polymers (AE-CPs) {[Ca3L2(H2O)6]·2H2O}n (1) and [Sr(H2L)2]n (2) were constructed from using 5-(ethyl oxamate)-isophthalic acid (H2EtL) ligand with alkaline earth metal ions Ca2+ and Sr2+ under solvothermal conditions, respectively. Among them, L and H2L are formed by in-situ hydrolysis of H2EtL, which display multiple kinds of coordinated modes through oxamate and carboxylate groups. 1 and 2 both show three-dimensional coordination frameworks possessing unprecedented (3,4,5)-connected skg1 topology and (3,6)-connected ant topology, respectively. The solid-state fluorescence properties of 1 and 2 were studied, and 1 with bright blue luminescence reveals selective sensing toward Fe3+ ion in water with the low detection limit (LOD) of 1.04 × 10−3 M.
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