S u~S o i i o r y h l i l o m e r r s a s h & W C o m~A~t sCompounds 1 form mtrd metal wmpkxes, whicb are insoluble in water and extractable'with CHC13 Due to tbe high N-H acidity of 1, complexation occurs with more than 20 metals, even in strongly acidic solution.N-Monosubstituierte N'-Sulfonylthioharnstoffe 1 lassen sich in einer einstufigen Synthese aus leicht zuganglichen Sulfonamiden und Isothiocyanaten darstellen ').

N-Butyl-N'-dansylthiourea (2) [dansyl = 5-(dimethylamino)-lnaphthylsulfonyl] is obtained by the reaction of dansylamide (1) with butyl isothiocyanate. The compound is a stable, fluorescent complex agent for a broad spectrum of metal ions. The UV

The title compounds (III) form neutral metal complexes which are insoluble in H2O and extractable with CHCl3.

The title compound (III) is a stable, fluorescent complex agent for a broad spectrum of metal ions.