Abstract：The quaternary mixed anion of rare earth with 2,3-dimethoxylbenzoic acid and 1,10-phenanthroline has been synthesized from the water-ethanol solution. Elemental analysis shows that the complexes general formula is RE(2,3-DMOBA)2NO3Phen(RE=La, Nd, Eu, Dy). The complexes are characterized by IR, UV, TG-DTA analysis. ν2+ν5，ν2+ν6 of NO-3 are observed in 1 772 and 1 737 cm-1 in IR spectra of complexes, it shows that NO-3 group is in a bridging-chelating mode in which two O atoms chelate to RE3+ ions. UV spectra of ligand and complexes are different, it shows that ligand 2,3-dimethoxylbenzoate and 1,10-phenanthroline coordinate to RE3+ ions. Visible absorption spectra of Nd(2,3-DMOBA)2NO3Phen show that hypersensitive transition of neodymium.
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