A (3,8)-Connected Metal-Organic Framework with Bending Dicarboxylate Linkers for C2H2/CO2 Separation.

Herein, by replacement of the linear terephthalate linker with the bending 2,5-thiophenedicarboxylate (tdc2-) linker in the typical (3,9)-connected metal-organic framework, with a reduced 8-connected hydroxyl-centered trinuclear cluster, a new (3,8)-connected network, [Ni3(µ3-OH)(tdc)3(tpp)] [DZU-1; tpp = 2,4,6-tris(4-pyridyl)pyridine], was synthesized. The modified pore environment enables DZU-1 to selectively adsorb C2H2 over CO2 in an efficient manner.

Poly[(µ(4)-biphenyl-3,3'-dicarboxyl-ato)bis[µ(2)-1,1'-(butane-1,4-di-yl)diimidazole](µ(2)-oxalato)dimanganese(II)].

In the title coordination compound, [Mn(2)(C(14)H(8)O(4))(C(2)O(4))(C(10)H(14)N(4))(2)](n), the biphenyl-3,3'-dicarboxyl-ate and oxalate anions, both situated on inversion centres, function in a bridging mode, linking the dinuclear Mn(II) atoms into wave-like layers. Each 1,1'-(1,4-butane-1,4-di-yl)diimidazole ligand coordinates to two Mn(II) atoms located in adjacent layers via Mn-N coordination bonds, giving a three-dimensional network. As the methyl-ene groups can bend freely relative to each other due to the C atoms connected via single bonds, the 1,1'-(butane-1,4-di-yl)diimidazole ligand forms an S-shaped conformation, which makes the void in the three-dimensional network distorted.

Ethyl 3-[2-(p-toluene-sulfonamido)phen-yl]acrylate.

In the title compound, C(18)H(19)NO(4)S, the two benzene rings form a dihedral angle of 52.2 (7)°. The crystal struture is stabilized by N-H⋯O hydrogen bonds, which link the molecules into dimers.

Melaminium sulfate.

In the title compound, C(3)H(8)N(6) (2+)·SO(4) (2-), the melaminium cations and sulfate anions are inter-connected by N-H⋯N and N-H⋯O hydrogen bonds, forming a layer in the (101) plane. The layers are connected through multiple hydrogen bonds and π-π stacking inter-actions (centroid-centroid distance of about 3.4 Å).

Bis(µ-3-carb-oxy-2-oxidobenzoato)-κO,O:O;κO:O,O-bis-[aqua-(2,2'-bipyridine-κN,N')copper(II)].

In the centrosymmetric dinuclear complex, [Cu(2)(C(8)H(4)O(5))(2)(C(10)H(8)N(2))(2)(H(2)O)(2)], the Cu(II) ion is coordinated by two N atoms from a bipyridine ligand, three O atoms from two 3-carb-oxy-2-oxidobenzoate dianions and the O atom of the water mol-ecule in a distorted octa-hedral geometry. The Cu--O(H) coordination [2.931 (3) Å] is very weak. In the crystal structure, the dinuclear units are linked into a two-dimensional network parallel to (010) by O-H⋯O hydrogen bonds.