RESUMO
Embedding cubane [M4 (OH)4 ] (M=Ni, Co) clusters within the matrix of metal-organic frameworks (MOFs) is a strategy to develop materials with unprecedented synergistic properties. Herein, a new material type based on the pore-space partition of the cubic primitive minimal-surface net (MOF-14-type) has been realized. CTGU-15 made from the [Ni4 (OH)4 ] cluster not only has very high BET surface area (3537â m2 g-1 ), but also exhibits bi-microporous features with well-defined micropores at 0.86â nm and 1.51â nm. Furthermore, CTGU-15 is stable even under high pH (0.1 m KOH), making it well suited for methanol oxidation in basic medium. The optimal hybrid catalyst KB&CTGU-15 (1:2) made from ketjen black (KB) and CTGU-15 exhibits an outstanding performance with a high mass specific peak current of 527â mA mg-1 and excellent peak current density (29.8â mA cm-2 ) at low potential (0.6â V). The isostructural cobalt structure (CTGU-16) has also been synthesized, further expanding the application potential of this material type.
RESUMO
The use of bifunctional ligands with phenol and pyridyl groups has been found to promote the formation of lithium cubane clusters intrinsically coded with specific preference for various hydrogen-bonding geometries including tetrahedral, square-planar, and linear modes through double, or even quadruple hydrogen bonding between adjacent nodes.
RESUMO
Reported here is a lithium cubane based zeolitic framework possessing a multi-dimensional channel system. The unique design strategy of adopting the ditopic ligand 4-pyridinol leads to a rigid porous framework with high thermal stability. It has a BET surface area of 440.3 m(2) g(-1) and a H(2) uptake capacity of 108.7 cm(3) g(-1) at 77 K.