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.
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Bjørgen et al. (2005) studied this question.
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