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Three novel metal–organic frameworks, Cu4(OH)2(SO4)(HBTC)2(bpy)·bpy (1), Cu1.5(H2O)(TMBTC)(bpy)·1/2H2O (2) and Cd2(H2O)5(TMBTC)(bpy)2·NO3·3H2O (3), constructed from mixed organic ligands, have been synthesized and characterized. Complex 1 crystallizes in monoclinic space group C2/c and possesses a 3D three-fold interpenetrating framework. The copper ions were first connected by HBTC and SO42− to generate a 1D ladder, which was further linked by a 4,4′-bipyridine ligand to give rise to a 3D interpenetrating framework. Complex 2 crystallizes in monoclinic space group P2/c and possesses a 3D two-fold interpenetrating framework. Similar to 1, the copper ions were first connected by TMBTC to generate a 1D tubular unit, which can be considered as the assembly block. The 1D tubular unit was further linked by 4,4′-bipyridine ligands to result in the formation of the 3D framework. Complex 3 crystallizes in monoclinic space group Cc and has a three-dimensional structure. Different from 1 and 2, the cadmium ions were first connected by a 4,4′-bipyridine ligand to form a 1D chain as the assembly unit, which was further linked by TMBTC ligand to generate the final 3D framework. The photoluminescence measurement of 3 in the solid state at room temperature showed that complex 3 exhibits luminescence, which can be assigned to an intraligand π→π* transition. [ABSTRACT FROM AUTHOR]

Biphasic solvothermal reaction of Cu(NO3)2·6H2O and 2,3,5,6-tetramethyl-1,4-benzenedicarboxylic acid (H2TBDC) resulted in the formation of a novel coordination polymer, [Cu(TBDC)1/2]·H2O (BPS-1). BPS-1possesses a 3D framework containing 1D Cu(i)–COO helical chains. The use of an organic solvent with a high boiling point and an extension of the reaction time play important roles in the reduction of Cu(ii) ions to Cu(i) ions and the formation of BPS-1. [ABSTRACT FROM AUTHOR]

A three-dimensional porous Zn metal-organic framework (UPC-12) with high thermal and chemical stability was isolated in high yield and purity from a hydrothermal reaction. UPC-12 exhibits high selectivity for CO2 due to the formation of hydrogen bonds between CO2 molecules and the −COOH groups exposed inside the channels and the effective π-π interactions between CO2 molecules and the pillared bipyridine moieties of the MOF. The adsorption-desorption process was studied, for the first time, by both 13C CP-TOSS NMR spectroscopy and in situ DRIFTS. [ABSTRACT FROM AUTHOR]