Synthesis, Structure and Luminescent Properties of a New Terbium（Ⅲ） Complex with 5-Bromoisophthalic Acid

摘要

The self-assembly of 5-bromoisophthalic acid （H2BIPA） with Tb（NO3）3·6H2O under hydrothermal conditions gives rise to a 3D coordination polymer, [Tb2（BIPA）3（CH3CH2OH）]n （1）, which was characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal is of monoclinic system, space group P21/c with a = 19.2591（17）, b = 8.2537（7）, c = 18.5663（17）, β = 104.4720（10）°, V = 2857.6（4）3, C26H15Br3O13Tb2, Mr = 1092.95, Dc = 2.540 g/cm3, F（000） = 2040, μ = 9.173 mm-1 and Z = 4. The final R = 0.0324 and wR = 0.0767 for 5299 observed reflections （I 〉 2σ（I））. Complex 1 displays an unusual three-dimensional （4,6）-connected network with （48.66.8）2（44.62）2（42.84） topology, which is different from [Tb（HBDC）（BDC）（H2O）4]·3.3H2O （BDC = isophthalate） because the -Br substituent of isophthalate results in different electronic effect and steric hindrance to change the coordination modes of carboxylate groups in the assembly process. Moreover, luminescent properties of 1 have also been investigated in the solid state.