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Abstract
Hydrothermal reactions of Pb(NO3)2 and 3-fluorophthalic acid (H2Fpht) in the absence or presence of 2,2′-bipyridine (bpy) gave two coordination polymers: Pb5(Fpht)4(Fba)2 (1) and [Pb2(Fpht)2(bpy)(H2O)]·3H2O (2). The 3-fluorobenzoic acid (HFba) results from an in situ decarboxylation of H2Fpht. Solid 1 displays a 2-D structure, comprising center-related hexanuclear [Pb3(COO)6]2 units. There are three crystallographically different Pb(II) ions and two different ligands, Fpht and Fba. The Fpht ligands adopt μ6 : η5η3 and μ6 : η3η4 unusual bridging coordination modes. A 3-D supramolecular architecture is formed via C–H⋯F hydrogen bonds. Solid 2 possesses a 1-D chain structure, comprising center-related tetranuclear [Pb2(COO)4]2 units. There are two crystallographically different Pb(II) ions. The Fpht ligands adopt μ3 : η2η3 and μ4 : η3η3 bridging coordination. The free water molecules form (H2O)3 clusters to link the 1-D chain by hydrogen bonds. A 3-D supramolecular assembly is constructed via hydrogen bonds between the free water and the F of Fpht ligands. Fluorescence of the complexes originates from π*–π transitions of the ligands.
Graphical Abstract
Hydrothermal reactions of Pb(NO3)2 with 3-fluorophthalic acid (H2Fpht) in the absence or presence of bpy yielded 2-D network Pb5(Fpht)4(Fba)2 (Fba = 3-fluorobenzoate) and 1-D chain [Pb2(Fpht)2(bpy)(H2O)]·3H2O.