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A series of lanthanide(Ⅲ)metal-organic coordination polymers [Ln(L)(H2O)2]·Solvent {Ln =Pr(1),Sm(2),Eu(3),Gd(4),Tb(5),Dy(6),Ho(7)} {H3L=5-(6-carboxynaphthalen-2-yl)isophtahalic acid} have been synthesized by reacting the corresponding rare earth salts with 5-(6-carboxynaphthalen-2-yl)isophtahalic acid under solvothermal reaction.