Novel one-dimensional lanthanide acrylic acid complexes: An alternative chain constructed by hydrogen bonding

Novel one-dimensional (1D) chains of three lanthanide complexes La(L ¹) ₃(CH ₃OH)]·CH ₃OH (L ¹=(E)-3-(2-hydroxyl-phenyl)-acrylic acid) 1, La(L ²) ₃(H ₂O) ₂]·2.75H ₂O (L ²=(E)-3-(3-hydroxyl-phenyl)-acrylic acid) 2, and La(L ³) ₃(CH ₃OH) ₂(H ₂O)] ·CH ₃OH (L ³=(E)-3-(4-hydroxyl-phenyl)-acrylic acid) 3 are reported. The crystal structure data are as follows for 1: C ₂₉H ₂₉LaO ₁₁, monoclinic, P2 ₁/n, a=15.4289(12) Å, b=7.9585(6) Å, c=23.041(2) Å, β=99.657(2)°, Z=4, R ₁=0.0637, wR ₂=0.0919; for 2: C ₂₇H _30.50LaO _13.75, triclinic, P-1, a=8.4719(17) Å, b=13.719(3) Å, c=14.570(3) Å, α=62.19(3)°, β=99.657(2)°, γ=78.22(3)°, Z=2, R ₁=0.0384, wR ₂=0.0820; and for 3: C ₃₀H ₃₅LaO ₁₃, monoclinic, P2(1)/c, a=9.5667(6) Å, b=24.3911(15) Å, c=14.0448(9) Å, β=109.245(2)°, Z=4, R ₁=0.0374, wR ₂=0.0630. All the three structure data were collected using graphite monochromated molybdenum Kα radiation and refined using full-matrix least-squares techniques on F ². These structures show that four kinds of the carboxylato bridge modes are included in these chains to link the La(III) ions. It is the first time that it has been found that the intra-chain hydrogen bonding can construct an alternative chain even, when the coordination bridge mode is the same along the chain (complex 2). There are 2D and 3D hydrogen bonding in the crystal lattices of complexes 1-3. Three kinds of 1D lanthanide complexes with acrylic acid ligands have been studied. The crystal structures show that four kinds of the carboxylato bridge modes are included in these chains. It is the first time that it has been found that the intra-chain hydrogen bonding can construct an alternative chain even when the coordination bridge mode is the same along the chain. There are 2D and 3D hydrogen bonding in the crystal lattices of the three complexes.