Syntheses and Crystal Structures of a Series of Coordination Complexes Derived from the Fluorescein Ligand

Solvothermal reaction of lanthanide(Ⅲ)salts with fluorescein(2-(6-hydroxy-3-oxo-3H-xanthen-9-yl)benzoic acid)led to a series of new coordination polymers {Ln(C20H11O5)-(C20H10O5)(H2O)]·DMF}n(Ln = Er,Eu,Gd,Tb,Tm,Yb)．The PXRD patterns of the complexes indicate they are isomorphous.The structure of complex {Er(C20H11O5)(C20H10O5)(H20)]·DMF}n has been determined by single-crystal X-ray diffraction,revealing a 2D framework in which DMF molecules were filled between the layers.The crystal structure belongs to the triclinic system,space group Pī,with α = 12.107(4),b = 12.232(4),с = 13.273(4)(A°),α = 68.005(7),β = 88.024(11),γ =77.451(8)°,V= 1776.7(9)(A°)3,Z= 2,Dc= 1.720 g/cm3,μ = 2.434 mm-1,F(000)= 918,Rint= 0.0584,T= 293(2)K,the final R = 0.0621 and wR = 0.1501.