Periodic organosilicas

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

SYNTHESIS AND PROTOLYTIC PROPERTIES OF THE PERIODICALLY ORDERED MESOPOROUS ORGANOSILICAS WITH MCM-41-TYPE ARCHITECTURES FUNCTIONALISED... 

I2 as a probe for aromatic rings in phenylene-bridged periodic mesoporous organosilica... 

Phenylene-bridged periodic mesoporous organosilicas, with both amorphous and crystal-like walls, (referred to in the following as AW-Ph-HMM and CW-Ph-HMM, respectively) were synthesized and characterized as previously reported [6,7]. BTEB was used as a precursor for both solids the surfactant was Brij-76 (Ci8H37(OCH2CH2)nOH) in acidic media for AW-Ph-HMM and octadecyl-trimethylammonium bromide(ODTMA) in basic media for CW-Ph-HMM. A purely siliceous MCM-41 sample was also synthesised, the first step being the solution of octadecyltrimethylammonium bromide in a basic aqueous solution (NH3), kept a 333 K. Tetraethyl orthosilicate (TEOS) was then added in all cases dropwise, and the mixture stirred for 24h at room temperature (H20 34.2 g/ NH3 (15%) 8.52 g/ ODTMA 0.73 g TEOS 3.24 g). After further 24 hours in hydrothermal conditions at 368 K, the sample... 

Hoffmann, F. Cornelius, M. Morell, J. Froba, M. 2006. Periodic mesoporous organosilicas (PMOs) Past, present, and future. J. Nanosc. Nanotech. 6 265-288. 

W. J. Hunks and G. A. Ozin, Challenges and advances in the chemistry of periodic mesoporous organosilicas (PMOs), J. Mater. Chem., 2005, 15, 3716. 

B. D. Hatton, K. Landskron, W. Whitnall, D. D. Perovic and G. A. Ozin, Spin Coated Periodic Mesoporous Organosilica Thin Films Towards a New Generation of Low-Dielectric-Constant Materials, Adv. Fund. Mater., 2005, 15, 823. 

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],...

MULTI-SILYLATED COMPOUNDS FOR THE SYNTHESIS OF (PERIODIC) MESOPOROUS ORGANOSILICAS (PMOs) 72... 

Single-Source Precursor Method Using Bis- and Multi-Silylated Compounds for the Synthesis of (Periodic) Mesoporous Organosilicas (PMOs)... 

Meanwhile, there are many indications that the precursor must obey certain structural requirements for the realization of the periodicity at the mesoscale of organosilicas ... 

Since the discovery of this first benzene-bridged mesoporous hybrid material with crystal-like pore walls, the series of organosilica precursors that give PMOs exhibiting molecular-scale periodicity was considerably extended. Kapoor et al. demonstrated with the formation of PMO products from the precursor 1,3 -bis(triethox-ysilyl)benzene (10) that a crystal-like organization of the organic bridges within the pore walls is not restricted to linear-substituted precursors.264... 

Hybrid Mesoporous Frameworks Periodic Mesoporous Organosilicas... 

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