Raman Spectroscopic Investigation of the Physical State of para-Nitroaniline in 
Channels of the AIPO4-5 Molecular Sieve

Hill, W.; Marlow, F.; Kornatowski, J.

doi:10.1366/0003702944028515

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Raman Spectroscopic Investigation of the Physical State of para-Nitroaniline in Channels of the AIPO₄-5 Molecular Sieve

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Marlow, F.
Zentrum für heterogene Katalyse, Rudower Chaussee 5, 12489 Berlin, Germany ;
Research Group Marlow, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Kornatowski, J.
Institut für Kristallographie und Mineralogie, J. W. Goethe Universität Frankfurt, Senckenberganlage 30, 60325 Frankfurt/Main, Germany ;
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Hill, W., Marlow, F., & Kornatowski, J. (1994). Raman Spectroscopic Investigation of the Physical State of para-Nitroaniline in Channels of the AIPO₄-5 Molecular Sieve. Applied Spectroscopy, 48(2), 224-227. doi:10.1366/0003702944028515.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-243F-A

Abstract

The physical state of para-nitroaniline (p-NA) adsorbed in the channels of AIPO₄-5 molecular sieves has been investigated by means of Raman spectroscopy. The Raman spectra show that the p-NA molecules within the channels form either a phase of head-to-tail chains similar to that in the solid crystaline p-NA with a characteristic ω₃ band at 1282 cm^-1 or a second phase, which is characterized by the similarly strong band around 1295 cm^-1. This second phase consists of weakly interacting p-NA molecules in a similar pseudo-quinonoidic state as molten p-NA. Despite the missing formation of solid-like chains, molecules in the second phase are also highly orientated. However, their mean nutation angle with respect to the crystal axis z is about 16°, and, thus, it is larger than that of the chains.