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It is shown by angle-resolved x-ray photoelectron spectroscopy that cavitands derived from resorcin[4]arenes provided with four dialkylsulfide chains form stable monolayers on gold surfaces that are well organized by self-assembly. The cavitand headgroups at the surface of the resorcin[4]arene monolayer act as molecular recognition sites for small organic molecules with remarkable selectivity for perchloroethylene ([C.sub.2][Cl.sub.4]). Comparati thermal desoption experiments indicate binding sites with high interaction energies of [C.sub.2][Cl.sub.4] at the surface of the resorcin[4]arene monolayers. Fast and reversible 'host-gue nanogram range) with a quartz microbalance oscillator provided with gold electrodes coated by resorcin[4]arene monolayers., Molecular recognition is an essential feature of many biological processes in living cells, for example, during the specific 'host-guest' coupling of compounds at receptors in lipid membranes. During the last [...]