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

【Author】

Wang Ruifen(~(1*),Wang Shuping~1,Zhang Jianjun~2(1.College of Chemistry, Hebei Normal University, Shijiazhuang 050091, China;2.Experimental Center, Hebei Normal University, Shijiazhuang 050016, China)

【Abstract】

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)°,(C_(66))H_(40)N_4O_(12)Cl_6Eu_2, M_r=1597.64, V=1.5533(2) nm~3, Z=1, D_c=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 R_(int)=(0.0776.)The crystal consists of binuclear molecules of the title compound. Each Eu~(3+) 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.

【Keywords】

europium; m-chlorobenzoic acid; 1,10-phenanthroline; crystal structure; luminescence; thermal decomposition; rare earths

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