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A novel metal-organic nanotube is synthesized and characterized using mixed organic ligands. The new nanotubular material can keep crystalline even after heating to 280 degree celsius for 1 hr.

To assemble metal-organic supramolecules such as a metallamacrcocycle and metal-organic coordinaifon cage (MCCC), a series of flexible dicarboxylate ligands with the appropriate angle, 2,2'-(2,3,5,6-tetramethyl-1,4-phenytene)-bis(methylene)bis(sulfanediyl)dibenzoic acid (H2L1), 2,2'-(2,5-diniethyl-1,4-phenylene)bis(methylene)bis(sulfanediyl)-dibenzoic acid (H2L2), 2,2'-(2,4,6-trimethyl-1,3-phenylene)bis(methylene)bis(sulfanediyl)dinicotinic acid (H2L3), and 2,2'-(2,4,6-trrmethyl-1,3-phenylene)bis(methylene)bis(sulfanediyl)dibenzoic add (H2L4), have been designed and synthesized. Using these flexible ligands to assemble with metal ions, six metal-organic supramolecules, Cd2(L1)2(dmf)4-(H2O)2∙H2O (1), Mn3(L2)2(2L2)(dmf)2(H2O)2∙5dmf (2), Cu4(L3)4(H2O)4∙3dmf (3), Cu4(L4)4(dmf)2(EtOH)2∙8dmf∙6H2O (4), Mn4(L4)4(dmf)4(H2O)4∙6dml∙H2O (5), and Mn3(L4)3(dmf)4∙2dmf&3x2219;3H2O (6), possessing a rectangular macrocycle, MOCCs or their extensions, and 1D or 2D coordination polymers, have been isolated. All complexes have been characterized by single-crystal X-ray diffraction, elemental analysis, and thermogravimetric analysis. Complex lisa discrete rectangular macrocycle, while complex 2 is a 20 macrocycle-based coordination polymer in which the L2 ligand adopts both syn and anti conformations. Complexes 3-5 are discrete MOCCs in which two binuclear metal dusters are engaged by tour organic ligands. The different geometries of the secondary building units (SBUS) and the axial coordinated solvates on the SBUS result in their different symmetries. Complex 6 is a 1 D coordination polymer, extended from a MCCC made up of two metal ions and three L4 uganda. All of the flexible dicarboxylate ligands adopt a syn conformation except that in complex 2, indicating that the syn conforniationat ligand is helpful for the formation of a metallamacrocycle and a MOCC. The magnetic properties of complexes 5 and 6 have also been studied. [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]