Persistent Methylbenzenium Ions in Protonated Zeolites: The Required Proton Affinity of the Guest Hydrocarbon

Protonated zeolites: Tetramethylbenzene (durene) forms a long‐lived mechanistically relevant carbenium ion within the micropores of zeolite H‐beta. Fourier transform infrared spectroscopy proved the existence of the cation by an absorption at 1604 cm−1. Also an electronic transition at 26 500 cm−1,...

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Bibliographic Details
Published in:Chemphyschem 2005-02, Vol.6 (2), p.232-235
Main Authors: Bjørgen, Morten, Bonino, Francesca, Arstad, Bjørnar, Kolboe, Stein, Lillerud, Karl-Petter, Zecchina, Adriano, Bordiga, Silvia
Format: Article
Language:English
Subjects:
carbocations
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Ion-exchange
IR spectroscopy
microporous materials
Porous materials
protonation
Surface physical chemistry
zeolites
Zeolites: preparations and properties
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Summary:Protonated zeolites: Tetramethylbenzene (durene) forms a long‐lived mechanistically relevant carbenium ion within the micropores of zeolite H‐beta. Fourier transform infrared spectroscopy proved the existence of the cation by an absorption at 1604 cm−1. Also an electronic transition at 26 500 cm−1, inherently linked to the tetramethylbenzenium cation, was observed. The cation was remarkably stable in the cavities of the zeolite, even at 400 K.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.200400422