| Abstract: Two lanthanide complexes [M(tddc)(NO3)(H2O)4]·2H2O[M=Eu (1), M=Dy (2)], where tddc2-=2,3-Dihydro-thieno[3,4-b][1,4] dioxine-5,7-dicarboxylic acid anion, have been synthesized and characterized by elemental analysis, IR spectra, thermal analyses, powder X-ray diffraction and single-crystal X-ray analysis. Both the crystals belong to triclinic, space group P1. For complex 1: a=0.802 28(19) nm, b=0.985 3(2) nm, c=1.147 6(3) nm, α=67.107(3)°, β=89.694(4)°, γ=80.428(4)°, V=0.822 3(3) nm3, Z=2, Mr=550.24, Dc=2.222 g·cm-3, F(000)=540, the final R=0.039 4 and wR=0.094 7 for observed reflections 3 639 with I>2σ(I). For complex 2: a=0.798 71(10) nm, b=0.983 76(13) nm, c=1.143 93(15) nm, α=67.108 0(10)°, β=89.823(3)°, γ=80.283(2)°, V=0.814 22(18) nm3, Z=2, Mr=560.24, Dc=2.291 g·cm-3, F(000)=536, the final R=0.043 6 and wR=0.114 0 for observed reflections 2 182 with I>2σ(I). The single crystal structures show that the two complexes are isomorphic and have one-dimensional chains structures and hydrogen bonds result in three-dimensional supramolecular structures. The complex 1 shows intense luminescence in the solid state at room temperature. CCDC: 698267, 1; 698268, 2. |
