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Three water-stable lanthanide coordination polymers(1-Ln,Ln(Ⅲ)= Tb,Eu,and Dy),[Ln(L)(HL)(H2O)2],where H2L = 4-(1H-1,2,4-triazol-1-yl)isophthalic acid,have been synthesized by solvothermal reaction and characterized by elemental analysis,FT-IR spectroscopy,powder X-ray diffraction(PXRD),and thermogravimetric analysis(TGA).