Abstract：Nine different proportional complexes of different nuclear rare earth perchlorate (Dy3+ and Tm3+ are mixed) with phenyl-phenacyl sulfoxide (L=C6H5COCH2SOC6H5) have been synthesized and characterized. Element analysis and coordination titration studies suggest that the complexes have the composition of (DyxTmy)L5(ClO4)3·2H2O(x∶y=1.000∶0.000, 0.999∶0.001, 0.995∶0.005, 0.990∶0.010, 0.900∶0.100, 0.800∶0.200, 0.700∶0.300, 0.600∶0.400, 0.500∶0.500). IR studies indicate that the ligand is bonded with RE(Ⅲ) through one oxygen atom in sulfoxyl group，and the oxygen atom in carbonyl group did not bond.The molar conductivities measured in the DMF solution indicate that three inorganic anions ClO-4 are non-coordinated. The fluorescence emission intensity of Dy3+ complexes would be enhanced strongly by mixing Tm3+. Tm3+ has the best sensitization to the fluorescence of Dy3+ in the ratio of 0.990∶0.010. The fluorescence intensity can be increased to 246%.
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