Terbium perchlorate reacted with isonicotinic acid （Hpya） and biphenyl-2,2′-dicarboxylic acid （H2dpa） under hydrothermal condition, a new ternary terbium complex [Tb（pya）（dpa）（H2O）]n （1） was synthesized. The structure of the ternary complex was determined by X-ray single crystal diffraction and characterized by elemental analysis, fluorescence measurement. The fluorescence spectrum shows the title complex emits strong green light. The crystal data for the complex: monoclinic, P21/n space group, a=0.8908（5） nm, b=1.0569（6） nm, c=2.0969（11） nm, β=98.446（8）°, V=1.9528（18） nm3, Z=4, R=0.0241, wR2=0.0534. The center Tb 3+ ion is eight coordinated. The coordination polyhedron around Tb 3+ ion can be described as a distorted square antiprism. The complex forms an infinite one-dimensional alternating chain polymer by bridging carboxyl groups of pya and dpa.
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