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The chapter discusses whether the high-frequency band of the C= N vibration is really due to the species formed as a result of acetonitrile interaction with the products of propene adsorption or should it belong to the nitrile molecules coordinated to A13+ Lewis acid sites. It is known for the complexes of acetonitrile with BHal3 compounds that the C=N stretching fundamental band reveals small but detectable shifts from about 1 up to 3 cm−1 after 10B by 11B substitution. This means that upon using isotopically substituted propene, a shift of the nitrile band should be expected due to the strong interaction of the C= N group with carbocations. For this purpose, in the study described in the chapter the infrared (IR) spectra of CD3CN adsorbed on HZSM-5 zeolite pretreated with both normal propene and propene-d6 were investigated at 300 K. The observed sensitivity of the CN frequency to isotopic substitution in propene leads to the conclusion that the nitrile C=N group of the resulting product is really bound to the positively charged C atom of propene but not to the Al3+ ion of the zeolite framework.
Original language | English |
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Pages (from-to) | 1623-1624 |
Number of pages | 2 |
Journal | Studies in Surface Science and Catalysis |
Volume | 75 |
Issue number | C |
DOIs | |
State | Published - 1 Jan 1993 |
ID: 41681468