Syntheses, Structures and Properties of Two Mn(II) Clusters Based on 1,10-Phenanthroline-2,9-dicarbaldehyde Dioxime Ligand

Two novel clusters [Mn-3(III)(mu(3)-O)(phendox)(3)]X center dot 13H(2)O (X = Cl (1), Br (2]) have been obtained from the solvothermal reactions of 1,10-phenanthroline-2,9-dicarbaldehyde dioxime (H(2)phendox) with MnCl2 center dot 4H(2)O or anhydrous MnBr2, and their structures were characterized by elemental analysis, FT-IR, XRD, TGA, MS and single-crystal X-ray diffraction. It crystallizes in trigonal, space group P3(1)/c. X-ray analysis reveals that the neighbouring [Mn-3(mu(3)-O)(phendox)(3)](+) cores are linked by C-H center dot center dot center dot Cl hydrogen bonds and form an infinite supramolecular chain along the c-axis. Neighbouring chains are packed with each other by off-set p-p interactions of the aromatic rings on phenox(2-). A 3D supramolecular architecture in a honeycomb topology is formed with 1D hexagonal channel in the dimensions of 13 angstrom x 13 angstrom along the c-axis. The gas adsorption studies show that compound 1 center dot 13H(2)O is stable upon the removal of guest molecules and the desolvated compound absorbed considerable amount of CO2.