4,4′′-Bis(4,4,5,5,6,6,6-heptafluoro-1,3-dioxohexyl)-o-terphenyl-4′-sulfonylchloride (BHHCT) is a sensitive label for time-resolved fluoroimmunoassays via the europium chelate. Ligand for TRF-complexes (with Eu3+) used for preparing Silica-Nanoparticles. Very large Stoke′s shift, broad exitation and narrow emission bands.Sensitive label for time-resolved fluoroimmunoassay via the europium chelate. Ligand for TRF-complexes (with Eu3+) used for preparing Silica-Nanoparticles. Very large Stoke′s shift, broad exitation and narrow emission bands.