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Solvothermal reaction of lanthanide(Ⅲ) salts with fluorescein (2-(6-hydroxy3-oxo-3H-xanthen-9-yl)benzoic acid) led to a series of new coordination polymers {[Ln(C 20 H 11 O 5)(C 20 H 10 O 5)(H 2 O)]·DMF} n (Ln=Er,Eu,Gd,Tb,Tm,Yb).The PXRD patterns of