Guo-Hua Wei

A series of 2D and 3D metal–organic frameworks based on different polycarboxylate anions and a flexible 2,2′-bis(1H-imidazolyl)ether ligand

Eight new coordination polymers, namely [Ni(L1)(BIE)] (1), [Cu(L1)(BIE)] (2), [Cu(L2)(BIE)] (3), [Co(L3)(BIE)] (4), [Cu(L4)0.5(BIE)] (5), [Co2(L4)(BIE)2]·H2O (6), [Cu5(L5)4(μ3-O)2(BIE)2(H2O)2] (7) and [Cu3(L6)2(BIE)2(H2O)3] (8), where L1 = p-phthalate, L2 = o-phthalate, L3 = oxalate, L4 = 1,2,4,5-benzenetetracarboxylate, L5 = m-phthalate, L6 = 1,3,5-benzenetricarboxylate and BIE = 2,2′-bis(1H-imidazolyl)ether, were successfully synthesized under hydrothermal conditions. Polymers1–4 display 2D layer structures. 1, 2 and 3 hold the similar 4-connected 44-sql nets, while 4 exhibits a 3-connected 63-hcb net. 5 possesses an unusual 4-connected Kagome net with two kinds of connected nodes. 6 shows a rare 3,4-connected (83)2(85·10) topology with 3-connected nodes and square-planar 4-connected nodes. 7 exhibits an α-Po topology based on pentanuclear Cu(II) cluster. 8 is a unique self-penetrating 2D network with 3,4-connected (6·72)(6·7·8)(62·7·82·9) topology. The structural differences of 1–8 suggest the importance of polycarboxylate ligands and central metals in the network construction of the coordination polymers.

9‐(Methoxymethyl)anthracene

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3,7,11,19,23,27-Hexaaza­tricyclo­[27.3.1.113,17]tetra­triaconta-1(32),13,15,17(34),29(33),30-hexa­ene hexa­chloride tetra­hydrate

The title compound, C28H52N6 6+·6Cl−·4H2O, is a dinucleating 28-membered centrosymmetric hexaazamacrocyclic complex. The macrocyclic ligand adopts a chair-like conformation, with the crystallographic inversion center located in the macrocyclic cavity. The six chloride ions and four water molecules are situated symmetrically outside the macrocyclic cavity. The crystal structure is stabilized by N—H⋯Cl, N—H⋯O and O—H⋯Cl hydrogen bonds.

1,1′-(4-Oxoheptane-1,7-di­yl)bis­(2-methyl-1H-benzimidazole) penta­hydrate

The title compound, C23H26N4O·5H2O, has noncrystallographic twofold rotation symmetry in the solid state. It crystallizes with five solvent water molecules in the asymmetric unit. Four of these water molecules are connected with each other via hydrogen-bonding interactions to form two types of centrosymmetric hexameric (H2O)6 rings. Via edge sharing of the hexamers, the water clusters thus build infinite chains that stretch parallel to the a axis. The fifth water molecule provides an additional connection between the two hexameric (H2O)6 units via hydrogen bonds to both rings. The water molecules in the channels along the a axis are also bonded via O—H⋯N hydrogen bonds to the organic units, and face-to-face π–π interactions [with centroid-to-centroid distances of 3.656 (1) Å and average face-to-face distances of 3.431 (5) Å] between the aromatic rings of adjacent molecules complete the intermolecular interactions in this structure.