A Defect-Rich Photocatalytic Titanium MOF

  • Author: Angewandte Chemie International Edition
  • Published Date: 26 June 2019
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: A Defect-Rich Photocatalytic Titanium MOF

Metal–organic frameworks (MOFs) are porous materials with many applications. Titanium-based MOFs are rare within this class of materials. TiIV tends to form ill-defined oxyhydroxides, and consequently, titanium MOFs are difficult to synthesize.

Bart Bueken, KU Leuven, Belgium, and colleagues, have synthesized a MOF called COK-47, which is the first titanium carboxylate featuring inorganic sheets of TiIVO6 octahedra pillared by organic 4,4'-biphenyldicarboxylate linkers. Each linker connects with one carboxylate to an edge-sharing pair of octahedra, while the other carboxylate binds to a corner sharing TiO6 pair in the next sheet. Depending on the synthesis conditions, the material can be prepared as well-defined rod-shaped crystals or highly defective nanoparticles.

The defective form of COK-47 is a promising catalyst because it contains a high density of coordinatively unsaturated titanium atoms and a large pore volume. The researchers discovered that COK-47 can oxidatively desulfurize dibenzothiophene in the presence of tert-butylhydroperoxide. Moreover, COK-47 photocatalytically degrades the organic dye rhodamine 6G under UV light.



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