Synthesis, structure, and luminescent properties of neutral tris-complexes of Eu 3+ and Sm 3+ with 4,4,5,5,6,6,6-heptafluoro-1-(1-methyl-1 H -pyrazol-4-yl)hexane-1,3-dione

The reaction of 4,4,5,5,6,6,6-heptafluoro-1-(1-methyl-1 H -pyrazol-4-yl)hexane-1,3-dione (HPyrC 3 F 7 ) with freshly precipitated hydrated europium(ɪɪɪ) and samarium(ɪɪɪ) hydroxides in EtOH afforded crystalline complexes of the composition [Ln(PyrC 3 F 7 ) 3 (EtOH) 2 ], the features of their formation depending on the stoichiometric ligand/metal ratios were studied. The structure and composition of the complexes were characterized by physicochemical methods, including single-crystal X-ray diffraction. The luminescent properties of these compounds in the crystalline state and in solutions were studied in detail. Possible ways of transferring electronic excitation in the complex [Eu(PyrC 3 F 7 ) 3 (EtOH) 2 ] were considered.