| Abstract: The binuclear cerium(Ⅲ) complex [Ce(Brapi)]2·2DMF with tripodal heptadentate Schiff base has been synthesized by solvothermal method, which the ligand H3Brapi is 1,3-bis[N-(5-bromo-2- hydroxylbenzylidene)-2-aminoethyl]-2-(5-bromo-2-hydroxyphenyl)imidazolidine. The crystal structure of the complex has been determined by X-ray single crystal diffraction method. Complex [Ce(Brapi)]2·DMF belong to monoclinic, space group P21/n, a=1.166 7(3) nm, b=1.348 29(3) nm, c=2.086 9(5) nm, β=96.314°, Z=2, V=3.263 0(14) nm3, Dc=1.849 Mg·m-3, R1=0.035 9, wR2=0.103 6. The structure of [Ce(Brapi)]2 reveals that the two ligands bridge the two metal ions forming a sandwich structure. The binuclear [Ce(Brapi)]2 has a square antiprismatic geometry around each cerium atom. Each Ce atom is coordinated by an N4O4 donor set, N2O from each ligand and two bridging phenolate O atoms, one from each heptadentate ligand with a Ce-Ce distance of 0.397 1(4) nm. The magnetic properties of the complex has been determined in the temperature range 2～300 K, indicating that the antiferromagnetic interaction between the central Ce<3+ ions. The analyzed result of fluorescent spectrum shows the complex has an emission at 503 nm, which could be assigned to intraligand fluorescence. CCDC: 733131. |
