The formation of the mesoporous material MCM-41 as studied by EPR line shape analysis of spin probes

Article Abstract:

Issues concerning the use of the spin-probe 5-doxyl stearic acid to reveal the mechanism of formation of the hexagonal mesoporous material MCM-41 are reported.

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The saddle form of cyclotriveratrylene

Article Abstract:

An attempt is made to show that the saddle form of CTV (and other peripherally hexa-substituted TBCN) can be obtained by rapidly quenching a hot solution or the high-temperature melt to below room temperature. The saddle form of CTV was quantitatively separated from the quenched material by column chromatography.

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Properties of the silica layer during the formation of MCM-41 studied by EPR of a silica-bound spin probe

Article Abstract:

The properties of the silica layer during the formation of the mesoporous material MCM-41 were investigated by electron paramagnetic resonance (EPR) experiments carried out on a specifically designed, organo(trialkoxy)-silane spin probe, SL1SiEt. It was found that the EPR spectra of hydrolyzed SL1SiEt throughout the room temperature part of the reaction are characteristic of a fast tumbling species, indicating that the silica is highly fluid before drying.

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