Materials that are organic-inorganic crystalline and porous are known as metal-organic frameworks (MOFs) . They have low density (0.2-1 g/cm 3 ), large specific surface areas (> 10,000 m 2 /g in some cases), and well-defined pore structures with high porosity up to 50% of the crystal volume . Reticular synthesis can be used to create them, resulting in framework structures or organized networks with solid connections connecting organic and organic moieties . By constructing secondary building units (SBUs) with appropriate organic linkers, the construction networks between the two moieties can adjust the geometry of MOFs . MOFs can have their functional groups and porosity altered using techniques like post-synthetic modification (PSM) . It is also possible to create multivariate MOFs (MTV-MOFs) with various metal nodes or clusters and additional organic functions .