{[Cd 3 (btec)(btx) 0.5 (m 3 -OH)(H 2 O)]?H 2 O} n (1) and [Cu 2 (btec)(btx) 1.5 ] n (2), two novel cadmium(II) and copper(II)-based high-connected metal-organic frameworks, with both 1,2,4,5benzenetetracarboxylate (btec) and 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene (btx) as mixed ligands were hydrothermally synthesized and structurally characterized. Both MOFs have three-dimensional (3D) structures, but different framework topologies and ligand linkage modes. 1 possesses an unprecedented binodal (4,12)-connected topology structure, in which the ligand btec serves as a rare dodecadentate and ordinary octadentate in two types of coordination modes. Meanwhile, 2 exhibits a binodal (4,7)-connected topological network with an enneadentate coordination geometry of the btec ligand. Both MOFs provide novel examples of designing and synthesizing novel binodal MOFs, and demonstrate that the 1,2,4,5-benzenetetracarboxylic acid ligand with rich coordination chemistry information is useful in the construction of binodal highly-connected nets. In addition, the catalytic performance of 2 has also been checked. 2 is active as a catalyst for the degradation of methyl orange. Experimental section Materials and general methodsAll the solvents and reagents for synthesis were commercially available and used as received. The ligand btx was synthesized according to a literature method. 8 Elemental analysis of C, H, and N were performed on a Perkin-Elmer 240C analyzer. IR spectra were measured on an FT-IR AVATAR 360 (Nicolet) spectrophotometer with KBr pellets. Powder X-ray diffraction

Two coordination polymers, [Ag 2 (pydca)(bbbi) 2 ] n (1) and [Co 2 (pydca) 2 (bbbi) 3 ] n ·nH 2 O (2) [pydca = pyridine-2,6-dicarboxylate, bbbi = 1,1Ј-(1,4-butylene)bis-1H-benzimidazole)] were hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, TG, PXRD, and single-crystal X-ray diffraction. Compound 1 features a one-dimensional helical chain structure bridged by bbbi

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