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A new terbium 2-isopropylimidazole-4,5-dicarboxylic acid complex was prepared and incorporated into titanium dioxide matrix by mild sol-gel method. Then we fabricated a terbium luminescent hybrid material, which displayed striking green emission even in pure water. It was interesting to find that this target material exhibited highly selective and fast (1 s) quenching effect to F(-) compared with CH(3)COO(-), Cl(-), Br(-), I(-). We recognized that the hydrogen bonding interactions between fluoride and ligand resulted in the recognition process. More significantly, this hybrid titania material prepared under low temperature (80 °C) could be used in photodegradation of methyl orange in aqueous environment.

In the title coordination polymer, [Ag(C14H8NO2)]n, the AgI cation is coordinated by two O atoms and one N atom from two symmetry-related acridine-9-carboxyl­ate ligands in a distorted trigonal-planar geometry. The metal atoms are connected by the ligands to form chains running parallel to the b axis. π–π stacking inter­actions [centroid-to-centroid distances 3.757 (2)–3.820 (2) Å] and weak Ag⋯O inter­actions further link the chains to form a layer network parallel to the ab plane. The AgI cation is disordered over two positions, with refined site-occupancy factors of 0.73 (3):0.27 (3).

Symmetry codes: (i) Àx; Ày; Àz; (ii) x À 1; y; z; (iii) Àx; Ày þ 1; Àz; (iv) Àx þ 1; Ày þ 1; Àz; (v) x þ 1; y; z; (vi) Àx; Ày; Àz À 1; (vii) x þ 2; y þ 1; z þ 1; (viii) Àx þ 1; Ày þ 1; Àz þ 1.