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Issue 43, 2011
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Hierarchically structured biphenylene-bridged periodic mesoporous organosilica

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Novel composites of highly ordered and stable biphenyl-bridged periodic mesoporous organosilica (PMO) materials confined within the pores of anodic alumina membranes (AAM) were successfully synthesized by evaporation-induced self-assembly (EISA). 4,4′-Bis(triethoxysilyl)biphenyl (BTEBP) was used as a precursor in combination with the ionic surfactant cetyltrimethylammonium bromide (CTAB) or triblock-copolymer F127 as structure-directing agents. The resulting mesophases were characterized by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). With ionic CTAB as a structure directing agent, samples with a mixture of the 2D-hexagonal columnar and a lamellar mesophase were obtained within the AAM channels. When using the nonionic surfactant F127, mesophases with a 2D-hexagonal circular structure were formed in the AAM channels. Additionally, a cubic Im[3 with combining macron]m phase could also be obtained with the same nonionic surfactant after the addition of lithium chloride to the precursor solution. The stability of both the circular and cubic biphenylene-bridged PMO against calcination temperatures of up to 250 °C was confirmed by NMR spectroscopy. Nitrogen sorption in the porous composite membrane shows typical type IV isotherms and narrow pore size distributions. All the biphenyl PMO/AAM composites show fluorescence due to the existence of biphenyl chromophores in the stable organosilica framework.

Graphical abstract: Hierarchically structured biphenylene-bridged periodic mesoporous organosilica

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Publication details

The article was received on 08 May 2011, accepted on 05 Aug 2011 and first published on 06 Oct 2011

Article type: Paper
DOI: 10.1039/C1JM12023A
Citation: J. Mater. Chem., 2011,21, 17338-17344
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    Hierarchically structured biphenylene-bridged periodic mesoporous organosilica

    Y. Li, A. Keilbach, M. Kienle, Y. Goto, S. Inagaki, P. Knochel and T. Bein, J. Mater. Chem., 2011, 21, 17338
    DOI: 10.1039/C1JM12023A

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