Through partial deligandation of metal-organic frameworks (MOFs),quasi-MOFs with a transition structure between MOFs and metal compounds (such as metal oxides,nitrides,sulfides,and phosphides) can be fabricated.Quasi-MOFs can not only retain the porous structure of MOFs to a certain extent,but also expose the inorganic nodes to the guest species (e.g.,metal nanoparticles) to show enhanced metal-support interaction for synergistic catalysis.This concept was first demonstrated by our group through calcining Au/MIL-101 at different temperatures under Ar flow to adjust the interface between Au nanoparticles and the inorganic Cr-O nodes.The obtained Au/quasi-MIL-101 showed superior enhanced catalytic activity in the oxidation of carbon monoxide.This study has inspired further research interest to fabricate other quasi-MOFs through controlled deligandation of mono-and bimetallic MOFs and their composites for the design of efficient catalysts.