{[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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The rational design and synthesis of novel coordination polymers (CPs) or metal-organic frameworks (MOFs) is of great interest in modern inorganic chemistry not only for their potential applications as functional materials in fields such as gas storage, luminescence, catalysis, ion exchange, and so on, but also for their intriguing variety of topologies. 1In particular, topology focuses on the network connectivity generated via the reduction of periodic nets into node-andlinker/vertex-and-edge representations, which helps greatly the understanding of structural complexity, variety and entanglements of the coordination architectures.2,3 It is no doubt that the discovery of artificial MOFs with predicted subnet topologies is of great significance in understanding supernet-subnet relations based on the knowledge of the chemical properties of the components (metals and ligands). Therefore, tiny variation of nodes may generate huge differences on topologies since the network topology is reflected by the symmetry of nodes and nature of edges. 2gFrom both zeolite chemistry and crystal engineering points of view, the nets built from 4-coordinated (4-c) centers capture much attention both for their inherent interest (all zeolites are 4-c nets) and from a theoretical point of view: many 4-c nets have been deduced and summarized firstly by Wells 2a followed by several comprehensive discussions.

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Two new cobalt(II) coordination polymers, namely [Co 1.5 (PhCOO) 3 (bbbm) 1.5 (H 2 O)] n (1) and [Co(chdc)-(bbbm)] n (2) (bbbm = 1,1 0 -(1,4-butanediyl)bis-1H-benzimidazole, H 2 chdc = 1,4-cyclohexanedicarboxylic acid), have been synthesized and structurally characterized by single crystal X-ray diffraction. The cobalt(II) centers display different environments, with trigonal-bipyramidal and octahedral geometries in 1 and a tetrahedral geometry in 2. The 1D linear chains of complex 1 and ladder-like chains of complex 2 are bridged by bbbm in bis-monodentate coordination mode; the variation of the carboxylate co-ligand effectively tunes the resulting framework architecture. The degradation of methyl orange in a photochemical Fenton-like process using complexes 1 and 2 as catalysts was investigated.