Coadsorption electron acceptor

Thus, it may again be concluded, as in the case of alkali coadsorption with H, that chemisorbed H exhibits amphoteric, i.e. both electron donor and electron acceptor characteristics. 

The example given above is not an isolated phenomenon. Table 2.9 (p. 269) gives examples of several systems where the coadsorption of an electron donor and an acceptor leads to the formation of ordered structures, while the coadsorption of two electron donors or two electron acceptors yields disordered surface monolayers. Thus, in these systems at least, it is clear that the attractive forces arising from donor-acceptor interaction are crucially important in determining the stability and structure of the coadsorption system. With the coadsorption of benzene with CO on Rh(l 11), there is little change in the decomposition/desorption temperatures of either the CO or benzene. By contrast, the coadsorption of CO with alkali metals can have... 

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