Crystal structure and properties of terbium o-methylbenzoate complex with 1,10-phenanthroline Tb(o-CH_3C_6H_4COO)_3(C_(12)H_8N_2)_2

摘要

A terbium o-methylbenzoate complex with 1,10-phenanthroline, Tb(o-MBA)3phen (where o-MBA=o-methylbenzoate and phen = 1,10-phenanthroline) was prepared from ethanol solution and its crystal structure was determined by X-ray diffraction. The crystal of the complex Th(o-MBA)3phen belongs to triclinic crystal system and P 1 (#2)space group. The crystal data are as follows: a = 1.4371(4) nm, b = 1.7387(2) nm, c = 1.3109(2) nm, α = 96.37(1)°, β =107.21 (2)°, γ= 82.78(2)°, V = 3.094(1) nm3, Z = 2, Mr = 1489.12, Dc = 1.598 g.cm-3,μ = 2.330 rnm-1 and F(000) = 1488.00.The final R and Rw are 0.038 and 0.047 for 8668 [Ⅰ＞2σ(Ⅰ)] unique reflections, respectively. In the complex each Tb3+ ion is eight-coordinated by one 1,10-phenanthroline molecule, one bidentate carboxylate group and four bridging carboxylate groups. The carboxylate groups are bonded to the terbium ion in two modes: the chelating bidentate and the bridging bidentate. Excitation and luminescence data observed at room temperature show that the title complex emits strong green fluorescence under ultraviolet light. The results of thermal analysis indicate that the complex Tb(o-MBA)3phen is quite stable to heat.