HKUST-1

HKUST-1 (HKUST ⇒ Hong Kong University of Science and Technology),[1] which is also called MOF-199,[2] is a material in the class of metal-organic frameworks (MOFs).

Metal-organic frameworks are crystalline materials, in which metals are linked by ligands (so-called linker molecules) to form repeating coordination motives extending in three dimensions.

One water molecules is coordinated to each of the two metal centers at the axial position of the paddlewheel unit in the hydrated state, which is usually found if the material is handled in air.

After an activation process (heating, vacuum), these water molecules can be removed (dehydrated state) and the coordination site at the metal atoms is left unoccupied.

[3][4][5] oxidation state publication name CuBTC In addition to monometallic HKUST-1 analogs, several mixed-metal HKUST-1 materials were synthesized, in which two metals are incorporated into the framework structure at crystallographically equivalent positions.

Framework structure of desolvated HKUST-1. The spheres represent two different types of pores within the framework structure. Blue: metal, red: oxygen, black: carbon.
Paddlewheel unit (secondary building unit) of the HKUST-1 structure in the hydrated state. One water molecules is coordinated to each of metal center at the axial position.
Paddlewheel unit (secondary building unit) of the HKUST-1 structure in the dehydrated state. The axial positions at the metal centers are not occupied (= coordinatively unsaturated site, CUS).