Template-directed construction of conformational supramolecular isomers for bilayer porous metal-organic frameworks with distinct gas sorption behaviors.

A pair of supramolecular isomers of Co(II)-based metal-organic frameworks can be directionally constructed in virtue of solvent templates, which show diverse bilayer networks and lattice packing with the same Co3 SBUs and organic linkers. The two porous materials show distinct gas sorption behaviors at different temperatures, especially their CO2 sorption selectivity.

Study on the heterogeneous degradation of chitosan with H(2)O(2) catalyzed by a new supermolecular assembly crystal: [C(6)H(8)N(2)](6)H(3)[PW(12)O(40)].2H(2)O.

A new supermolecular assembly crystal, [C(6)H(8)N(2)](6)H(3)[PW(12)O(40)].2H(2)O (DMB-PWA), was synthesized with phosphotungstic acid (PWA) and 1,2-diaminobenzene (DMB) under hydrothermal conditions and was characterized by Fourier-transform infrared spectra (FTIR) and single-crystal X-ray diffraction analysis. DMB-PWA could effectively catalyze oxidative degradation of chitosan with H(2)O(2) in the heterogeneous phase. The optimum degradation conditions were determined by orthogonal tests as follows: amount of chitosan 1.00 g, 30% (wt %); H(2)O(2), 3.0 mL; dosage of catalyst, 0.06 g; reaction temperature, 85 degrees C; and reaction time, 30 min. The water-soluble chitosan with a viscosity-average molecular weight (M(v)) of 4900 was obtained under the optimum degradation conditions and was characterized by FTIR, ultraviolet-visible diffuse reflection spectra (UV-vis DRS), and X-ray powder diffraction analysis.

1,2-Di-2-pyridylethyl-ene-phenyl-succinic acid (1/1).

In the title 1:1 adduct, C(10)H(10)O(4)·C(12)H(10)N(2), the two components are linked by O-H⋯N hydrogen bonds to form a one-dimensional chain. The dihedral angle between the pyridine rings is 15.68 (8)° These chains are further inter-connected by weak inter-molecular C-H⋯O hydrogen bonds and weak C-H⋯π inter-actions to generate a three-dimensional network.