Host- guest interactions in zeolite cavities
作者： A. Zecchina , R. Buzzoni , S. Bordiga , F. Geobaldo , D. Scarano
DOI: 10.1016/S0167-2991(06)81892-6
关键词:
摘要: Abstract When molecules of low-medium proton affinity (B = N2, CO, C2H4, C2H2, propene, methylacetylene, acetonitrile and H2O) are adsorbed on acidic zeolites, the resulting host-guest interactions in cavities channels dominated by hydrogen bonding neutral Z-H…B adducts between Bronsted groups Z-bH (Z zeolite framework) base. If interaction is sufficiently strong protonated products stable (ethylene, acetylene, propene methylacetylene) bonded precursors slowly consumed with formation olygomeric entrapped into cavities. Acetonitrile gives a stronger not followed protonation. Water initially complexes; however when more than one water molecule per protonic site present, H5O2+·nH2O species formed. high affinities (NH3 Py), B-H+···Z− ionic pairs readily appear. The modifications induced spectrum B-H+ Z− can be used to probe basicity negatively charged framework. At higher filling conditions B-H+···B dimers also observed. basic IR spectroscopy all these systems discussed detail.
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