The trinuclear triangular Cu-ll complex [Cu-3(mu(3)-OH) (mu-pz)3(HC00)(2)(Hpz)(2)] (Hpz = pyrazole) reacts with 4,4'-bipyridine (bpy) yielding a two-dimensional (2D) waved sheets, two three-dimensional (3D) coordination polymers (CPs), as well as a hexanuclear Cu-11 cluster, depending on the reagent ratios and reaction conditions. Single crystal X-ray diffraction (XRD) determinations point out that, while CPs crystal structures are not porous, the hexanuclear Cu-ll clusters are packed in the solid state generating a stable porous 3D supramolecular network, where two kinds of perpendicular, hydrophobic channels (ca. 4.83 X 5.86 angstrom(2) and 4.99 X 4.79 angstrom(2), corresponding to the 24.7% of the total crystal volume) are present. In the "as-synthesized" compound, channels of one kind are empty, while the other ones are occupied by guest bpy molecules which can be removed by soaking the crystals in suitable solvents (benzene, toluene, c-hexane) maintaining intact the crystal skeleton. Moreover, two of the above complexes act as catalysts (or catalyst precursors) in the peroxidative oxidation of cyclohexane.
New Coordination Polymers and Porous Supramolecular Metal Organic Network Based on the Trinuclear Triangular Secondary Building Unit [Cu-3(mu(3)-0H)(mu-pz)(3)](2+) and 4,4 '-Bypiridine. 1 degrees
DI NICOLA, CORRADO;PETTINARI, Claudio;
2012-01-01
Abstract
The trinuclear triangular Cu-ll complex [Cu-3(mu(3)-OH) (mu-pz)3(HC00)(2)(Hpz)(2)] (Hpz = pyrazole) reacts with 4,4'-bipyridine (bpy) yielding a two-dimensional (2D) waved sheets, two three-dimensional (3D) coordination polymers (CPs), as well as a hexanuclear Cu-11 cluster, depending on the reagent ratios and reaction conditions. Single crystal X-ray diffraction (XRD) determinations point out that, while CPs crystal structures are not porous, the hexanuclear Cu-ll clusters are packed in the solid state generating a stable porous 3D supramolecular network, where two kinds of perpendicular, hydrophobic channels (ca. 4.83 X 5.86 angstrom(2) and 4.99 X 4.79 angstrom(2), corresponding to the 24.7% of the total crystal volume) are present. In the "as-synthesized" compound, channels of one kind are empty, while the other ones are occupied by guest bpy molecules which can be removed by soaking the crystals in suitable solvents (benzene, toluene, c-hexane) maintaining intact the crystal skeleton. Moreover, two of the above complexes act as catalysts (or catalyst precursors) in the peroxidative oxidation of cyclohexane.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
