Metal Organic Frameworks (MOFs) are constructed by metal ions/clusters and multidentate organic linkers via coordination bonds (reticular synthesis) have significantly enriched the domain of porous materials [ 1 , 2 ]. Based on the flexibility of the constituents, geometry, size and functionality, MOFs with a crystalline nature possess extremely high surface areas (typically ranging from 1000 to 10,000 m 2 g -1 ) and tunable pore sizes/characteristics. These aspects endow MOFs with fantastic functionalities/properties for a variety of applications such as gas adsorption, separation, catalysis, sensors, drug delivery, proton conduction etc [ 2 ]. In the de novo synthesis of MOFs, ligands with relatively high pKa (e.g. azoles) easily produce robust frameworks with low-valent metal ions, while linkers with relatively low pKa (e.g. carboxylic acids) tend to bind with high-valent metal ions to give stable structures. In general, dense and rigid frameworks are constructed by rigid and h...