Beilstein J. Nanotechnol.2011,2, 284–292, doi:10.3762/bjnano.2.33
have been described for carboxylate complexes of Eu(III) [21]. The fluorescence spectrum of the modified silica shows a distinct shoulder at around λem.≈ 515 nm. This indicates a complex radiative relaxation of the formed transition metal species, the fluorescence originating from at least two