A method for encoding solid-phase split/mix combinatorial libraries using the chemical shift of synthetic fluoroarenes ('F-codes') has been developed. They have wide chemical shift dispersion and are detectable at the sub-μmol level. 19F NMR is used for decoding. Nine fluoroarenes bearing linkers for attachment to solid-phase synthesis supports through a photocleavable group were prepared. A library of 90 N-alkylglycines bearing substituted ...