Functionalized mesoporous ordered

The mesoporous ordered silicas of different type represent the new generation of materials with unique properties. The discovery of these materials became basis for creation of new catalysts, adsorbents, sensors and supporter for other molecules. The most important way of the modifying physical and chemical properties of mesopurous silicas consist in organic components incorporation on the silica surface as part of the silicate walls or their insertion within channels of the mesopores. This ensured that interest in synthesis and study of functionalized mesoporous materials shai ply grew. In spite of it, these materials are studied insufficiently. 

Sulfonic Acid Functionalization of Ordered Mesoporous Materials and Periodic Organosilicas... 

SBA-15 is a mesoporous ordered silica with promising properties as a catalyst support [1], where functionalization of the siliceous carrier with an active component can be achieved through a number of methods [2]. In this study we describe the use of the deposition-precipitation technique (DP) employed to functionalize the SBA-15 with Pt. The use of the DP method on the SBA class of materials has not been studied so far, excluding a few studies dealing with deposition of gold on titania-modified SBA-15 [3, 4]. The method... 

Zhang, X., Wu, W., Wang, J., and Tian, X. 2008. Direct synthesis and characterization of highly ordered functional mesoporous silica thin films with high amino-groups content. Appl. Surf. Sci. 254 2893-2899. 

Domansky K, Liu J, Wang L-Q, Engelhard MH, Baskaran S (2001) Chemical sensors based on dielectric response of functionalized mesoporous silica films. J Mater Res 16 2810-2816 Falcaro P, Bertolo JM, Innocenzi P, Amenitsch H, Bearzotti A (2004) Ordered mesostmctured silica films effect of pore surface on its sensing properties. J Sol-Gel Sci Technol 32 107-110 Flanigen EM, Broach RW, Wilson ST (2010) Introduction. In Kulprathipanja S (ed) Zeolites in industrieil separation and catalysis. Wiley-VCH, Weinheim... 

TABLE 24-1. FUNCTIONALIZATION OF ORDERED MESOPOROUS SILICA FILMS... 

P. Kahta et al. have reported the synthesis of triflic acid (TFA)-functionalized mesoporous nanocage 40 having tunable pore diameters applying wet impregnation method as an effective catalyst, under solventless system. The surface of the highly ordered, three-dimensional, cage-type mesoporous... 

Vila, N., Ghanbaja, J., Aubert, E., and Walcarius, A. (2014) Electrochemically assisted generation of highly ordered azide-functionalized mesoporous silica for oriented hybrid films. Angew. Chem., Int Ed., 53 (11), 2945 2950. 

Zhu, L Zhang, C., Liu, Y., Wang, D., and Chen, J. (2010) Direct synthesis of ordered JV-methylimidazolium functionalized mesoporous silica as highly efficient anion exchanger of Cr (VI)./, Mater. Chem., 20,1553-1559. 

Li Z, Yan W, Dai S (2005) Surface functionalization of ordered mesoporous carbons. A comparative study. Langmuir 21 11999-12006... 

A chiral bis(oxazoline) ligand was covalently functionahzed onto a hierarchically ordered mesocellular mesoporous silica and applied to the asymmetric Henry reaction between various aldehydes and nitromethane at ambient temperature. As a chiral heterogeneous catalyst, this functionalized mesoporous material showed excellent enantioselectivity in the asymmetric Henry reaction when the free silanol groups of the mesoporous silica were capped by trimethylsilyl groups. And also this catalyst could be magnetically separated from the reaction mixture without significant loss of reactivity or enantioselectivity [94]. 

In order to overcome these problems, attention was focused on the use of heterogeneous catalysis. We have found that functionalized solid materials, e.g., ionic liquids or tin triflates immobilized into mesoporous materials, can be used in N-acylation reactions as environmentally friendly replacements for traditional homogeneous acids which are useful but environmentally unacceptable catalysts [17, 18]. They had comparable activity to homogeneous reagents but can offer greater stability, safer and easier handling and can be... 

---