Periodic mesoporous phenylene-silicas

Bion et al [122] showed that the pore diameter of periodic mesoporous phenylene-silicas could be varied from 3.2 to 3.9 nm by changing the length of the hydrocarbon chain of the alkyltrimethylammonium halide surfactant (C TMAC1/Br) with n ranging from 14 to 18, respectively. 

Jung et al [145] reported for the first time the adsorption of hydrogen at 78 K and room temperature under moderate pressure by a periodic mesoporous phenylene-silica with crystal-like wall structure and by mesoporous silica. They observed a maximum hydrogen uptake of 0.9 wt% in the highly ordered crystallike mesoporous phenylene-silica material at room temperature and 20 atm. The hydrogen capacity of the mesoporous silica material at 20 atm and room temperature was 2.2 times lower than that of the crystal-like PMO. 

Gomes, A.C., Louren< o, M.A.O., Bruno, S.M., Ferreira, P., Valente, A.A., Pillinger, M., and Gonsalves, I.S. (2014) Postsynthetic modification of crystal-like periodic mesoporous phenylene-silica with ferrocenyl groups. /. Organomet Chem., 751, 501-507. 

I.S. (2013) Preparation of crystal-like periodic mesoporous phenylene-silica derivatized with ferrocene and its use as a catalyst for the oxidation of styrene. Dalton Trans., 42, 14612-14620. 

Lourenco et al. (2013) reported N-alkylation reaction of amine functionalized phenylene moieties in crystal-like mesoporous silica. A potassium iodide catalyzed method commonly used for the selective N-monoalkylation of aniline, was adapted and optimized to the N-monoalkylation reactions of the amine functionalized periodic mesoporous phenylene-silica (NH2-PMO) under microwave irradiation with conservation of the ordered mesostructure and the crystal-like molecular scale periodicity of the material. This functionalization opens a path for the preparation of new materials with different amino-alkyl groups specially designed for a desired application. 

Phenylen-silica 3730 60 2153 Ordered periodic mesoporous organosUica material (246)... 

Figure 3.7 Schematic of the incorporation of organic groups in the pore walls of mesoporous silica using bridged organosilane precursors (top). Schematic of the structure of a phenylene-bridged hybrid mesoporous organosilica with both atomic and mesoporous periodicity (bottom) [36],...

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