Formation of CuI—N2adducts at 298 and 77 K in CuI-ZSM-5: an FTIR investigation
- 1 January 1995
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 91 (18) , 3285-3290
- https://doi.org/10.1039/ft9959103285
Abstract
CuI-exchanged ZSM-5 contacted with N2 at room temperature or at 77 K exhibits a narrow IR band at 2295 cm–1. On the basis of 14N2/14N2 and 14N2/14N15N/15N2 isotopic substitution experiments this peak is assigned to the N—N stretching vibration of CuI—N2 end-on dinitrogen complexes formed on isolated CuI sites inside the zeolite channels. The problem of the location of the CuI ions and the role of surface heterogeneity in determining the FWHM (ca. 9 cm–1 at N2 coverage θ= 1) of the 2295 cm–1 band are discussed. Some hypotheses concerning the bonding structure are made by comparison with the spectra of the purely electrostatic M+–N2 and M+–CO adducts (where M+ is an alkali-metal ion) and of the CuI—CO complex formed on the same support.Keywords
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