Synthesis, Structure And Luminescence Of Rare Earth Complexes Of L - 2 - Thiophenyl Tartaric Acid

A series of L-di-2-thenoyltartaric acid(L-Di-2-TTA) lanthanide coordination polymers with similar structure, namely, {[Ln2L3(CH3OH)x(H2O)7-x]·aCH3OH·bH2O}n(Ln = La(1), Ce(2), Nd(3), Sm(4), Pr’(12), Nd’(13), Sm’(14)), {[Ln2L3(CH3OH)x(H2O)6-x] aCH3OH·bH2O}n(Ln = Eu(5), Gd(6), Tb(7), Dy(8) Ho(9), Er(10), Yb(11)), {[Ln2L3(bpy)(CH3OH)(H2O)5] aCH3OH·bH2O}n(Ln = Nd(15), Sm(16)) have been synthesized by facile reactions of H2L(H2L = L-Di-2-TTA) with LnCl3·6H2O under ambient temperature. Futher, three series of two-component lanthanide complexes {[(Smx Gd1-x)2L3(CH3OH)3(H2O)3]·aCH3OH·bH2O}n(17a-17j), {[(Sm0.20Ln0.80)2L3(CH3OH)x(H2O)y]·aCH3OH·bH2O}n(18-24), {[(EuxTb1-x)2L3(CH3OH)2(H2O)4]·CH3OH·2.75H2O}n(25, 25a-25i), and two three-component lanthanide complexes {[(Eu0.051Tb0.406La0.543)2L3(CH3OH)2(H2O)4]·0.5CH3OH·2H2O}n(26), {[(Eu0.068Tb0.363Gd0.569)2L3(CH3OH)4(H2O)2]·0.5CH3OH·H2O}n(27) have been synthesized through the doping of lanthanide ions. All complexes have been characterized by ememental adnlysis, IR, UV, PXRD, TG-DSC. X-ray diffraction and PXRD power diffraction analysis reveals that these complexes are one-dimensional ladder-like chain structure.The luminescent spectra for single-lanthanide complexes reveal that complexes 3, 13 and 15 exhibit Near-infrared emission of Nd3+ ions; complexes 1 and 6 display the intense ligand-centered blue emission; complexes 5 and 7 show characterized red and green emission, respectibely; complexes 4, 14, 16 and 8 exhibit co-luminescence of the ligand and the lanthanide ions. The magnetic analysis indicates that complex 8 has slow magnetic relaxation characteristics.The luminescent spectra for lanthanide-mixed complexes suggest that the characterized emission intensity from Sm3+ ion of complexes Sm-Ln show obvious increase by the doping of Ln3+ ions; complexes Eu-Tb exhibit color-tunable luminescence from green to yellow and red by changing the molar ratio of lanthanide ions; complexes 25–27 display color-tunable luminescence from yellow, white to blue under variation of excitation wavelength, notably, high-purity white light emission have been obtained. Such doped lanthanide complexes can be a strategy for obtaining color-tunable and white-emitting materials.