Synthesis and characterization of silver(I) derivatives containing acylpyrazolonate and phosphino ligands: X-ray crystal structures of monomeric [Ag(QnPe)(PPh3)2] and of dimeric [{Ag(QnPe)(PiBu3)}2] (QnPe = 1-phenyl-3-methyl-4-tert-butylacetylpyrazolon-

New silver(I) acylpyrazolonate derivatives have been synthesized and characterized in the solid state and solution. They are polymeric, dimeric or monomeric, depending on the presence of phosphine ligands and molar ratios employed.