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Two new metal-organic frameworks (MOFs) {[Cu 3 (timb) 2 (chtc) 2 ]·14H 2 O} n , (I) and {[Co 3 (timb) 2 (chtc) 2 ]·6H 2 O} n , (II) were hydrothermally synthesized by corresponding metal salt with mixed organic ligands of 1,3,5-tris[(1H-imidazol-1-yl)methyl]benzene (timb) and cyclohexane-1,3,5-tricarboxylic acid (H3chtc). Crystal structural analysis reveals that they exhibit varied structures. In the MOFs (I), Cu II  adopts an four coordination geometry, timb and cyclohexane-1,3,5-tricarboxylate ligands bridge neighboring Cu II  centers to result in two different one-dimensional knotted chains along the [0 − 1 2] and [1 0 − 1] directions, respectively. The two kinds of chains intersect each other  vis  Cu II  centers, resulting in a two-dimensional layered structure running parallel to the (1 2 1) plane. Adjacent layers are further linked by water moleculars  via  classical O–H…O hydrogen-bonding interactions, giving rise to a three-dimensional supramolecular network structure in the solid state. While in MOFs (II), the cyclohexane-1,3,5-tricarboxylate anions link the Co II  cations to generate a two-dimensional sheeted metal-organic structure running parallel to the  bc  plane. Adjacent sheets are further bridged by timb ligands, forming a porous three-dimensional metal-organic framework with a rare (3, 4)-connected (6.8 2 ) 2 (6 2 .8 4 ) 3 (6 2 .8) 2  topology. The solvent water molecules guest in the micropores of porous framework  via  water-carboxylate O–H…O hydrogen bonds. In addition, their thermal stabilities have also been investigated.

molecular crystals and liquid crystals

Synthesis, crystal structure and characterization of two new metal-organic frameworks with 1,3,5-tris[(1H-imidazol-1-yl)methyl]benzene and cyclohexane-1,3,5-tricarboxylate ligands