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Four lanthanide complexes with a general formula [Ln(3,5-DmeoxBA)3(phen)]2(Ln =Tb(1)Dy(2),Er(3),Yb(4); 3,5-DmeoxBA =3,5-Dimethoxybenzoic acid; phen = 1,10-phenanthroline)were synthesized and characterized by elemental analysis,infrared spectra(IR),and thermogravimetric,differential scanning calorimetry techniques combine Fourier transform infrared(TG/DSC-FTIR)technology.