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Hydrothermal reactions of Bi_2O_3 with pyridine-2,6-dicarboxylic acid(2,6-H_2pdc) and trimesic acid(H3btc)/pyromellitic acid(H4pyr) lead to two bismuth-organic frameworks, namely, [Bi(2,6-pdc)(H_2btc)(H_2O)2]n(1) and [Bi_2(2,6-pdc)2(H2pyr)(H_2O)_2]n(2). Compound 1 crystallizes in the space group P2_1/c. The dimeric {Bi_2} units are linked by 2,6-pdc2-ligands to form 1D chains; Compound 2 exhibits a 2D layered structure with 44 network topology by using dimeric {Bi_2} as secondary building units(SBUs). The chains and layers in 1 and 2 are further arranged into 3D supramolecular structures via hydrogen bonding interactions. The compounds emit blue luminescence. Furthermore, the PXRD, TGA, UV-visible and IR spectra were also studied. Compounds 1, 2 represent good examples of using mixed-ligand approach to construct diversity of luminescent bismuth-organic frameworks.
Hydrothermal reactions of Bi_2O_3 with pyridine-2,6-dicarboxylic acid (2,6-H_2pdc) and trimesic acid (H3btc) / pyromellitic acid (H4pyr) lead to two bismuth-organic frameworks, namely, (H_2btc) (H_2O) 2] n (1) and [Bi_2 (2,6-pdc) 2 (H2pyr) (H_2O) _2] n (2). Compound 1 crystallizes in the space group P2_1 / c. The dimeric {Bi_2} units are linked by 2,6-pdc2-ligands to form 1D chains; Compound 2 exhibits a 2D layered structure with 44 network topology by using dimeric {Bi_2} as secondary building units (SBUs). The chains and layers in 1 and 2 are further arranged into 3D supramolecular structures via hydrogen bonding interactions. Furthermore, the PXRD, TGA, UV-visible and IR spectra were also studied. Compounds 1, 2 represent good examples of using mixed-ligand approach to construct diversity of luminescent bismuth-organic frameworks.