Synthesis, Crystal Structure and Thermal Stability of a Saturated Dimeric Ce（III）-chelated Complex Based on Benzoate and 1,10-Phenanthroline Ligands

The title complex, [Ce（BA）3phen]2 （BA = benzoate, phen = 1,10-phenanthroline）, was prepared by the reaction of Ce（NO3）3.6H2O, benzoic acid and 1,10-phenanthroline. The complex was characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra and TG-DTG techniques. The results show that the crystal is of triclinic, space group P1 with a = 10.912（2）, b = 11.962（3）, c = 12.474（3） A, α = 104.889（3）, β = 93.523（3）, γ = 113.332（3）^o, C66H46Ce2N4O12, Mr = 1366.90, V= 1420.2（6） ,A^3, Z = 1, Dc = 1.598 g/cm^3, μ = 1.652 mm^-1, S = 1.024 and F（000） = 682. The final R = 0.0391 and wR = 0.0947 for 4878 observed reflections with I 〉 2σ（I）. The structure of the title complex consists of two Ce（C6HsCOO）3（C12H8N2） units, forming a binuclear molecule. Each Ce（Ⅲ） is coordinated by two O atoms of one bidentate chelating carboxylate group, five O atoms of two bidentate bridging and two tridentate chelating-bridging carboxylate groups, and two N atoms of one 1,10-phenanthroline molecule to complete a distorted monocapped square antiprism geometry. Its thermogravimetric analysis was determined by TG-DTG techniques.