Synthesis, Crystal Structures and Properties of Lanthanide Complexes [M(tddc)(NO3)(H2O)4]•2H2O (M=Eu, Dy)

Two lanthanide complexes [M(tddc)(NO3)(H2O)(4)]center dot 2H(2)O [M=Eu (1), M=Dy (2)], where tddc(2-)=2,3-Dihydrothieno [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 tniclinic, space group P (1) over bar. For complex 1: a=0.802 28 (19) nm, b=0.985 3 (2) nm, c=1.147 6(3) nm, alpha=67.107(3)degrees, beta=89.694(4)degrees, gamma=80.428(4)degrees, V=0.822 3(3) nm(3), Z=2, M-r=550.24, D-c=2.222 g.cm(-3), F(000)=540, the final R=0.0394 and wR=0.0947 for observed reflections 3 639 with I>2 sigma(I). For complex 2: a=0.79871 (10) nm, b=0.983 76(13) nm, c=1.143 93(15) run, alpha=67.108 0(10)degrees, beta=89.823(3)degrees, gamma=80.283(2)degrees, V=0.814 22(18) nm(3), Z=2, M-r=560.24, D-c=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>2 sigma(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.