Syntheses,Crystal Structures and Thermal Stability of Two Complexes of La（Ⅲ）/Ce（Ⅲ） Assembled by H2TBTA and Phen

Two 2D layer complexes {La(TBTA)1.5(phen)2H2O]·3H2O}n (1) and {Ce(TBTA)1.5(phen)2H2O]·3H2O}n (2) (H2TBTA = 2,3,5,6-tetrabromoterephthalic acid, phen = 1.10-phenanthroline) have been synthesized and characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra and thermogravimetric analyses. Both crystals belong to monoclinic, space group P21/n. Crystal data for 1: a = 8.7097(11), b = 34.276(4), c = 13.7281(17) , β = 95.397(2)o, V = 4080.1(9) 3, Z = 4, LaC36H24Br6N4O10, Mr = 1290.96, Dc = 2.102 g/cm3, μ(MoKα) = 6.983 mm-1, F(000) = 2460.0, T = 296(2) K, the final R (I > 2σ(I)) = 0.0478 and wR (all data) = 0.0985 for 10127 independent (Rint = 0.0775) and 7137 observed reflections with I > 2σ(I). Crystal data for 2: a = 8.709(2), b = 34.202(9), c = 13.685(4), β = 95.714(4), V = 4055.9(19)3, Z = 4, CeBr6C36H24O10N4, Mr = 1292.17, Dc = 2.116 g/cm3, μ(MoKα) = 7.094 mm-1, F(000) = 2464.0, T = 296(2) K, the final R (I > 2σ(I)) = 0.0590 and wR (all data) = 0.1453 for 10014 independent (Rint = 0.1253) and 6081 observed reflections with I > 2σ(I). Both complexes are allomerism with the general molecular formula of {M(TBTA)1.5(phen)2H2O]·3H2O}n. In the structures, the H2TBTA ligands adopt a monodentate coordination mode. Both the 2D layer frameworks are further extended to be 3D layers via H-bonding interactions.