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Keywords:

  • carbocations;
  • IR spectroscopy;
  • microporous materials;
  • protonation;
  • zeolites
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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.