Crystal Structure and Properties of Europium m-Chlorobenzoate Complex with 1, 10-Phenanthroline

A europium m-chlorobenzoate complex with 1,10-phenanthroline Eu(m-ClBA)3(phen)]2 single crystal, where m-ClBA=m-chlorobenzoate and phen=1,10- phenanthroline,was prepared and structurally characterized by X-ray diffraction. It crystallizes in triclinic, space group P1- with a=1.10138(8)nm, b=1.18606(9) nm, c=1.32516(10) nm, α=112.5390(10)°, β=92.1700(10)°, γ=101.6220(10)°,C66H40N4O12Cl6Eu2, Mr=1597.64, V=1.5533(2) nm3, Z=1, Dc=1.708 g·cm-3, μ(Mo Kα)=2.325 mm-1, F(000)= 788, the final R=0.0424 and wR=0.0899 for 6856 independent reflections with Rint=0.0776.The crystal consists of binuclear molecules of the title compound. Each Eu3 ion is nine-coordinated to one 1,10-phenanthroline molecule, one bidentate carboxylate group and four bridging carboxylate groups. The carboxylate groups are bonded to the europium ion in three modes: the chelating bidentate, the bridging bidentate and bridging-chelating thridentate. Excitation and luminescence data observed at room temperature show that the title complex emits very intensive red fluorescence under ultraviolet light. The results of thermal analysis indicate that the complex ［Eu(m-ClBA)3(phen)］2 is quite stable to heat.

Crystal Structure and Properties of Europium m-Chlorobenzoate Complex with 1,10-Phenanthroline