Various pH-Dependent Copper(II) Coordination Architectures Constructed from N,N′-Di(3-pyridyl)succinamide and Two Different Dicarboxylates

Using a bis-pyridyl-bis-amide N,N′-di(3-pyridyl)succinamide (L) and two dicarboxylates as mixed ligands, four 2D copper(ii) metal–organic networks, formulated as [Cu(1,4-chdc)(L)]·3H2O (1), [Cu(1,4-chdc)(L)]·H2O (2), [Cu(2,5-tdc)(L)]·H2O (3), and [Cu(2,5-tdc)(L)]·2H2O (4) (L = N,N′-di(3-pyridyl)succinimide; 1,4-H2chdc = 1,4-cyclohexanedicarboxylic acid; 2,5-H2tdc = thiophen-2,5-dicarboxylic acid) have been hydrothermally synthesized under different pH conditions, and characterized by IR spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. Compound 1, formed at pH 5.4, contains two rare types of left-, right-handed [Cu-L]n helix chains, which are further connected by [Cu-1,4-chdc]n zigzag chains, affording a 2D wave-like polymeric network. Compound 2 was obtained at pH 5.9, and shows a 2D square-grid layer constructed from zigzag [Cu-L]n chains and linear [Cu-1,4-chdc]n chains. Compounds 3 and 4 possess a similar 2D grid layer to that of 2 with 44-sql topology, formed at pH 4.8 and 5.4 respectively, and are constructed from zigzag [Cu-L]n chains and linear [Cu-2,5-tdc]n chains. The effects of pH and secondary dicarboxylates on the diversity of structures are discussed. In addition, the thermal stabilities, photoluminescence properties, and photocatalytic activity of compounds 1–4 were also studied.

Aminopyridine derivatives controlled the assembly and various properties of Cu–BTC metal–organic frameworks

Three Cu(ii) MOFs based on three aminopyridine derivatives and 1,3,5-benzenetricarboxylic acid have been synthesized and characterized. The electrocatalytic and photocatalytic properties of complexes 1–3 have been investigated in detail.

Three Coordination Polymers Built by Methoxyphenyl Imidazole Dicarboxylate: Solvothermal Syntheses, Crystal Structures, and Properties

Three coordination polymers [Sr(p-H2MOPhIDC)2]n (1) (p-H3MOPhIDC = 2-p-methoxyphenyl-1H-imidazole-4,5-dicarboxylic acid), {[Cd2(p-HMOPhIDC)2(4,4′-bipy)]⋅H2O}n (4,4′-bipy = 4,4′-bipyridine) (2), and [Zn(p-HMOPhIDC)(4,4′-bipy)]n (3) have been solvothermally synthesized, and structurally characterized by single-crystal X-ray diffraction. Polymer 1 indicates a three-dimensional framework, which can be simplified as a 6-connected lattice. Polymer 2 is also a three-dimensional framework, and contains mixed bridging ligands HMOPhIDC2– and 4,4′-bipy. Polymer 3 exhibits a sheet structure bearing infinite rectangles. The coordination modes of the p-H3MOPhIDC ligand, and the thermal and solid-state photoluminescence properties of the polymers have been investigated as well.