Monovalent atom bond exchange

The VBSCD serves also as a model for understanding the status of electronic delocalization in isoelectronic series. Consider, for example, the following exchange process between monovalent atoms, which exchange a bond while passing through an X3 cluster in which three electrons are delocalized over three centers. 

O—C02) are formed together with carbonate ions in some cases. The interaction is believed to result from the chemisorption of C02 in a bent configuration on surface oxygen atoms. Since the stable species are not formed on the monovalent cation zeolites, the divalent cations must promote the chemisorption. Furthermore, since the frequencies observed are a function of the exchanged cation, the adsorption must occur in the vicinity of the cations. Adsorption of water and ammonia removed the 1575 and 1380 cm-1 bands and formed bands at 1620 and 1450 cm"1, respectively. The carbonate bands were restored by evacuation at 300°C. Benzene had no effect. The observations are believed to reflect hydrogen bonding. 

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