NDLI: Synthesis of Superacid-Functionalized Mesoporous Nanocages with Tunable Pore Diameters and Their Application in the Synthesis of Coumarins

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Synthesis of Superacid-Functionalized Mesoporous Nanocages with Tunable Pore Diameters and Their Application in the Synthesis of Coumarins

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kalita, Pranjal Zaidi, S. M. Javaid Chari, Murugulla A. Sathyaseelan, B. Mano, Ajayan Vinu, Ajayan
Description	Author Affiliation: Kalita P ( International Center for Materials Nanoarchitectonics, World Premier International (WPI) Research Initiative, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.)
Abstract	Here we demonstrate for the first time the preparation of a triflic acid (TFA)-functionalized mesoporous nanocage with tunable pore diameters by the wet impregnation method. The obtained materials have been unambiguously characterized by XRD, $N_{2}$ adsorption, FTIR spectroscopy, and $NH_{3}$ temperature-programmed desorption (TPD). From the characterization results, it has been found that the TFA molecules are firmly anchored on the surface of the mesoporous supports without affecting their acidity. We also demonstrate the effect of the pore and cage diameter of the KIT-5 supports on the loading of TFA molecules inside the pore channels. It has been found that the total acidity of the materials increases with an increase in the TFA loading on the support, whereas the acidity of the materials decreases with an increase in the pore diameter of the support. The acidity of the TFA-functionalized mesoporous nanocages is much higher than that of the zeolites and metal-substituted mesoporous acidic catalysts. The TFA-functionalized materials have also been employed as the catalysts for the synthesis of 7-hydroxy-4-methylcoumarin by means of the Pechmann reaction under solvent-free conditions. It has been found that the catalytic activity of the TFA-functionalized KIT-5 is much higher than that of zeolites and metal-substituted mesoporous catalytic materials in the synthesis of coumarin derivatives. The stability of the catalyst is extremely good and can be reused several times without much loss of activity in the above reaction.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	9
Volume Number	16
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2010-03-01
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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