Zinc(II) 2D Coordination Polymer With Terephthalate and 4,6‐Bis(Imidazol‐1‐yl)‐2,1,3‐Benzoxadiazole Linkers as a Selective Luminescent Probe for Gallium(III) Cations

A two‐dimensional (2D) zinc(II) coordination polymer CP‐1, [Zn(im2bod)(bdc)]n (im2bod = 4,6‐bis(imidazol‐1‐yl)‐2,1,3‐benzoxadiazole, bdc2− = 1,4‐benzenedicarboxylate), was synthesized and fully characterized. CP‐1 crystallizes in the monoclinic crystal system, space group P21/n. Zn2+ ions adopt a four‐coordinated distorted tetrahedral geometry. The structure of CP‐1 comprises a two‐dimensional layer consisting Zn2+ cations connected by im2bod and bdc2− ligands. The adjutant layers participate in π‐π stacking interactions via the benzene and 2,1,3‐benzoxadiazole rings. CP‐1 demonstrated a blue emission with the maximum at 490 nm and a photoluminescence quantum yield 24%. Luminescent sensing properties of CP‐1 in aqueous suspension toward metal cations were evaluated, and selective emission quenching response was observed toward Ga3+ cations with the limit of detection 10 μM.