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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Two d 10 metal coordination polymers with bis-benzimidazole ligands, [(Ag(L 1 have been synthesized hydrothermally and characterized by elemental analysis, IR spectroscopy, thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Compound 1 features a ribbon-like chain structure bridged by L 1 ligands, and is ultimately extended into a 2D supramolecular network through two kinds of π-π stacking interactions. Compound 2 displays a (6,3) wave-like layer in which [Cu 6 (µ-CN) 6 (L 2 ) 2 ] n double chains are interconnected by pairs of L 2 bridges. The fluorescence properties of the compounds in the solid state at room temperature were investigated.

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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.

Two metal-organic coordination polymers of Co II with the molecular formulae [Co(L 1 )(tp)(H 2 O) 2 ] n (1) and [Co(L 2 )(tp)·H 2 O] n (2) [L 1 = 1,4-bis(benzimidazole-1-ylmethyl)-benzene; L 2 = 1,1-(1,4-butanediyl)bis(5,6-dimethylbenzimidazole); tp = terephthalate] were synthesized and characterized by single-crystal X-ray diffraction studies, infrared spectroscopy (IR), thermogravimetric analysis (TGA), X-ray powder diffraction (XRPD), and elemental analysis.Supporting Information (see footnote on the first page of this article): ORTEP plots of the coordination environments; emission spectra; TG curves, and XRPD patterns of compounds 1 and 2.