Metal-organic frameworks (MOFs) are porous crystalline materials with a high tunability. To improve the functionality of the original frameworks, several strategies, such as the use of different metal cations and organic ligands and post-synthetic modification, have been developed, enabling the use of MOFs in numerous practical applications in various fields. Recently, another approach, i.e., MOF-on-MOF architecturing, has been actively studied by combining two or more MOFs into a composite. MOF-on-MOF materials not only possess the intrinsic properties of each MOF but also exhibit unprecedented synergism within a single system, resulting in a considerable potential for various applications. This review summarizes the interesting areas of application of MOF-on-MOF architectures into three categories: separation, catalysis, and sensing. In particular, the synergism occurring within such MOF-on-MOF architectures is discussed.
New energetic materials are required to compensate for the shortcomings of the current ones. Especially secondary explosives are the ones with low-sensitivity, while maintaining energetic performance similar to those of primary ones, and particularly useful when safety must be ensured. Herein, we report two energetic metal-organic frameworks (eMOFs), eMOF-1, [Mn 5 (mtz) 6.1 (atz) 2.9 (NO 3 )] (mtz = 5-methyltetrazole, atz = 5-aminotetrazole) and eMOF-2, [Cu(mtz) 2 ], both of which have unique detonation and sensitivity properties. In particular, eMOF-1, firstly reported here, shows better energetic performance when compared with the previously reported material, Cd-based mtz MOF, an isostructural series. In addition, eMOF-2 synthesized in water shows a great detonation performance, whereas isotopological Zn-based mtz MOF did not show a meaningful performance as an explosive. Therefore, such reticular approach, i. e. replacing metal ions or ligands in isostructural frameworks, can be quite effective for the development of a new breed of energetic materials.
The Cover Feature shows the energetic metal‐organic framework‐1 (eMOF‐1) composed of manganese and two different tetrazole ligands (5‐methyltetrazole and 5‐aminotetrazole). eMOF‐1 possesses noticeable detonation properties and insensitivity as secondary explosive. In addition, eMOF‐1 has enhanced explosive performance relative to its isoreticular Cd counterpart, implying that a reticular MOF approach would provide the synthetic strategy to tune the explosive properties of framework solids. More information can be found in the Full Paper by H.‐W. Yoo, W. Choe, H. Ri Moon and co‐workers.
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