We have investigated the reactions of various organic and inorganic molecules on semiconductor and metal oxide surfaces and have identified dative bonding between Lewis acids and bases as a key process for many surface reactions. These Lewis acid-base complexes mediate various surface reaction mechanisms and lead to trapped intermediates which play a signficant role in the reaction kinetics of many processes. The author will provide various examples including self-assembling adsorption, reactions of amino acids on semiconductors and reaction of organo metalics on metal oxide surfaces.