Models of chemisorbed ethene and ethyne on Cu(111)

Studies of ethylene (ethene) and acetylene (ethyne) chemisorbed on Cu(111), a surface with which they interact relatively weakly, have led to the following proposed structures for the molecular adsorption complexes.

A. Plan view of the Cu(111) surface showing the adsorption geometry of athylene and acetylene molecules at low temperatures.

B. Perspective view of the Cu(111) surface with an adsorbed acetylene molecule, illustrating the re-hybridisation of the carbon centres to a geometry more closely associated with a C=C double-bond configuration.

Pictures adapted from the BALSAC Picture Gallery by K. Hermann, Theory Department, Fritz-Haber-Institut, Berlin

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