Title
Probing framework-guest interactions in phenylene-bridged periodic mesoporous organosilica using spin-probe EPR Probing framework-guest interactions in phenylene-bridged periodic mesoporous organosilica using spin-probe EPR
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Sciences. Physics
Publication type
article
Publication
Cambridge ,
Subject
Physics
Chemistry
Source (journal)
Physical chemistry, chemical physics / Chemical Society [London] - Cambridge, 1999, currens
Volume/pages
16(2014) :41 , p. 22623-22631
ISSN
1463-9076
ISI
000342766500023
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The pore walls of phenylene-bridged periodic mesoporous organosilicas (B-PMOs) can be crystal-like or amorphous depending on the synthesis conditions. Here, spin-probe electron paramagnetic resonance (EPR) is used to monitor the adsorption of nitroxide radicals on three types of B-PMO with varying pore size and wall characteristics. Nitroxide radicals with varying polarity are chosen as probes to mimic guest molecules with different properties. The study shows that the B-PMO materials with amorphous walls allow an overall better adsorption of the spin probes than the one with crystalline walls, independent of the nature of the spin probe. The effect of hydration of the guest-host system on the mobility of the spin probe molecule depends more on the nature of the spin probe than on the B-PMO material. Comparison of the spin-probe adsorption on B-PMOs and ethylene-bridged PMO materials shows the sensitivity of the mobility of the guest molecule to the nature of the organic group.
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