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Updated: Jun 13, 2026

Synthesis of Zeolites Using the ADOR (Assembly-Disassembly-Organization-Reassembly) Route
Published on: April 3, 2016
Localization of p-nitroaniline chains inside zeolite ZSM-5 with second-harmonic generation microscopy
Monique A van der Veen1, Bert F Sels, Dirk E De Vos
1Department of Microbial and Molecular Systems, Centre for Surface Chemistry and Catalysis, Kasteelpark Arenberg 23, Belgium.
Abstract:
For the first time, second-harmonic generation microscopy (SHGM) has been employed to study zeolites. Large ZSM-5 crystals filled with p-nitroaniline (PNA) dipoles have been visualized. It is shown that SHGM can discriminate between the straight b-pores and the sinusoidal a-pores of this zeolite, thus revealing the intergrown structure of these crystals. Moreover, it is shown that dipole chains are formed not only in the b-pores but also in the a-pores. PNA only assembles into dipole chains of parallel orientation in those pores that are directly accessible from the outer surface. The area in which this PNA ordering prevails is limited to a strip near the outer surface of the zeolite crystal. A rationalization for these two observations is offered.
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