A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Recommanded Product: 52093-25-1, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 52093-25-1, Name is Europium(III) trifluoromethanesulfonate, molecular formula is C3EuF9O9S3. In a Conference Paper, authors is Pietraszkiewicz, Marek，once mentioned of 52093-25-1
Novel ligands incorporating diphenylphosphinoxide groups form very stable and extremely luminescent complexes with Eu(III) and Tb(III) ions, when excited with UV radiation. Their luminescence is very stable in water media, indicating that water has no influence on vibronic OH quenching of the luminescence. Ligand 1, based on cyclotriphosphazene, contains six Ph2PO groups, whereas the ionisable compound 2 contains a bidentate model ligand (N-diphenylphosphinoxide-p-toluenesulphonamide). Both ligands form lanthanide complexes very poorly soluble in water. The complex luminescence characteristics were investigated in aqueous media, but due to their incomplete solubilisation only qualitative data were obtained.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI