I.r. absorption bands near 1500 and 3000 cm–1 indicate the presence of π-bonded species from ethylene chemisorbed on silica-supported Pd and Pt catalysts; these co-exist with σ-bonded M-CH2CH2-M species but are more readily removed than the latter by hydrogen.
J. D. Prentice, A. Lesiunas and N. Sheppard, J. Chem. Soc., Chem. Commun., 1976, 76 DOI: 10.1039/C39760000076
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