Structures of Chemisorbed Benzene

Although in the earlier sections we have omitted mention of the chemisorption of benzene and other aromatic molecules so as not to muddy the waters unnecessarily, there have been a number of structure determinations of chemisorbed benzene that are conveniently described at this point. On surfaces of trigonal symmetry (i.e. fee (111) and eph (001)) the molecule sometimes forms disordered overlayers, which can be forced into long-range order by co-adsorbing carbon 

For further references to work on chemisorbed benzene, see the Further Reading section at the end of the chapter. 

TABLE 4.7. Average Bond Strengths (kJ mol ) Used for Calcnlating the C—M Bond Strengths Shown in Table 4.8 

TABLE 4.8. Initial Sticking Probabilities (ao) and Heats of Adsorption (-AH) of Ethene at 300 K Species Identified at Various Stages of Coverage and Corresponding C—M Bond Strengths  

Only reversible adsorption occurs on Pd(lOO), so the adsorbed state cannot be identified it may be either the tv or di-cr form or a mixture of the two. On the nickel surfaces, the species CCH could not be identified certainly it may be either 21 or 22. OnNi(llO) and Rh(lOO) no further species could be determined. 

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