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Enantiomerically pure lanthanide(Ⅲ)-based phosphonates are successfully synthesized by using (R)-or (S)-(1-phenylethylamino)-methylphosphonate acid (pempH2),namely,R-or S-[Tb3(pempH2)2(pempH)7]-Cl2·H2O (R-Tb or S-Tb),crystallizing in chiral space group P212121.Compound R-Tb shows a one-dimensional homochiral triple-stranded helical chain structure where the Tb(Ⅲ) atoms are bridged by O-P-O units and μ3-O(P) bridge.The thermal analysis,photoluminescence as well as optically active properties of compounds R-Tb and S-Tb have also been investigated.