2,5-Disubstituted tetrazoles are obtained in good yields by the reaction of phenylsulfonylhydrazones of aromatic aldehydes (and cinnamaldehyde) with arenediazonium salts. From the synthetic viewpoint for tetrazoles, this method may be of high synthetic utility on account of the availability of starting materials, the simplicity of procedure, and higher yields.

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ZIF-8 is a flexible zeolitic imidazole-based metal–organic framework and has been extensively studied because of its high structural stability. However, ZIF-8 is hydrolyzed in water at higher temperature, resulting in degradation of its crystalline and porous structure. In order to prevent ZIF-8 from structural collapse due to the hydrolysis reaction of the metal–ligand bond and/or ligand substitution reaction, it is effective to shield the metal–ligand bond from the attack of water molecules. This work reports on the thermal and hydrothermal stability of mechanochemically synthesized ZIF-8 and presents an incredibly simple step to modify the outermost surface of ZIF-8, improving the hydrothermal stability. The partial carbonization resulting in the formation of a carbon-rich outermost layer endowed ZIF-8 with not only high hydrothermal stability but also a high adsorption rate on liquid phase adsorption.

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