Periodic mesoporous organosilicas (PMO) prepared by self-assembly of bissilylated organic bridge precursors in the presence of template molecules started to be developed in 1999.[1] In 2002, a phenylene PMO possessing both mesoporous and molecular-scale periodicity was synthesized using octadecyltrimethylammonium bromide surfactant.[2] We have shown that it was possible to preserve the 2D hexagonal arrangement of pores together with the order along the wall using alkyltrimethylammonium surfactants with alkyl chain from 14 to 18 as template, Scheme 1.[3]
Here, we present a study of the structural and morphological characteristics of phenylene-PMOs prepared using alkyltrimethylammonium or alkyl methyl-imidazolinium bromide, at different pH, temperature and in presence or absence of additives. PMOs were characterized using N2 isotherms, XRD, SEM and TEM, solid-state NMR and thermal analyses.
Acknowledgements: FCOMP-01-0124-FEDER-015644 (PTDC/QUI-QUI/113678/2009) and FCOMP-01-0124-FEDER-037271 (PEst-C/CTM/LA0011/2013) co-financed by FCT, FEDER, QREN-COMPETE. Cost CM1101. PF holds an Investigador FCT position. MAOL acknowledges a PhD grant SFRH/BD/80883/2011.
[1] a) Asefa, T.; MacLachlan, M. J.; Coombs, N.; Ozin, G. A., Nature 1999, 402 867. b) Inagaki, S.; Guan, S.; Fukushima, Y.; Ohsuna, T.; Terasaki, O., J. Am. Chem. Soc. 1999, 121, 9611. c) Melde, B. J.; Holland, B. T.; Blanford, C. F.; Stein, A., Chem. Mater. 1999, 11, 3302.
[2] Inagaki, S.; Guan, S.; Ohsuna, T.; Terasaki, O. Nature 2002, 416, 304.
[3] N. Bion, P. Ferreira, A. Valente, I. S. Gonçalves, J. Rocha, J. Mater. Chem.2003, 13, 1910.
pcferreira@ua.pt
