chlorocarbonyl thiophene with the corresponding amino acid ester in the presence of NEt3. The coordination behaviour of these new ligands towards Ag(I) and Au(I)/Au(III) complexes has been studied. In the case of the methionine ester conjugate the coordination of the gold or silver fragments takes place through the sulfur atom of the methionine, and for the silver species [Ag(OTf)(PPh3)] coordination as HN^S