MOFs with Metal Active Sites
The catalytic activity observed for these materials is
directly related to their metallic components, either as isolated
metal centers or as clusters104 (dimers,36 trimers,105 tetramers,12
etc.), chains,106 or sheets,107,108 connected through the
organic linkers. This group of MOFs includes materials with
only one type of metal center (M), which simultaneously
acts as a structural building component and a catalytic active
site. Other MOFs contain two different types of metals: one
of them (M1) is responsible for the catalytic activity, while
the second metal (M2) has only a structural role and is not
directly involved in catalysis. Whereas M1 is commonly a
single metal site, M2 can be either a single metal ion or a
cluster. A representation of the general structure of these
materials is shown in Scheme 7.
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