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  Polarized IR Spectra of p-Nitroaniline-Loaded AlP04-5 Single Crystals

Marlow, F., Demuth, D., Stucky, G., & Schüth, F. (1995). Polarized IR Spectra of p-Nitroaniline-Loaded AlP04-5 Single Crystals. The Journal of Physical Chemistry, 99(4), 1306-1310. doi:10.1021/j100004a034.

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Marlow, F.1, 2, Author              
Demuth, D.3, 4, Author              
Stucky, G.5, Author
Schüth, F.3, 4, Author              
Affiliations:
1lnstitut fur Angewandte Chemie, Berlin-Adlershof FRG, ou_persistent22              
2Research Group Marlow, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445612              
3Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universitat Mainz, FRG, ou_persistent22              
4Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
5Department of Chemistry, University of Califomia, Santa Barbara, California 93106, ou_persistent22              

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 Abstract: Single crystals of the aluminophosphate AlP04-5 loaded with different amounts of p-nitroaniline (PNA) were investigated by polarized IR microspectroscopy. For a loading of 4 wt % the bands due to PNA were almost totally polarized. From the dicroic ratios a mean deviation of the long molecule axis from the crystal c-axis of around 12° can be inferred. At higher loading levels H bonding between adjacent PNA molecules reduces the symmetry, thus leading to dicroic ratios closer to unity. However, absorption bands related to the aromatic ring are less affected by the H bonding and show dicroic ratios comparable to those of the lowly loaded samples. This means that also in the high-loading situation the orientation of the molecules by the channel system is very high. Heating of the highly loaded sample to up to 573 K leads to a breaking of the H bonds, the spectrum changes from a solid like type to a solution type spectrum

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Language(s): eng - English
 Dates: 1995-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/j100004a034
 Degree: -

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Title: The Journal of Physical Chemistry
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: - Volume / Issue: 99 (4) Sequence Number: - Start / End Page: 1306 - 1310 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766_3