| Abstract: Two novel two-dimensional lanthanide-based coordination polymers {(H2prz)[Ln2(pzdc)4(H2O)2]·5H2O}n(Ln=Eu(1), Tb(2)) were obtained by the hydrothermal reactions of Ln(NO3)3, 2,3-pyrazinedicarboxylic acid (H2pzdc), and piperazine (prz) with 1∶1∶2 mole ratio. Single-crystal X-ray diffraction analysis reveals that 1 and 2 are isostructural, and its crystallizes in triclinic, space group P1. For 1, a=0.850 39(5) nm, b=1.032 08(5) nm, c=1.158 97(8) nm, α=66.913(5)°, β=84.216(5)°, γ=81.259(4)°, V=0.923 91(9) nm3, Z=1, Dc=2.125 Mg·m-3, F(000)=582, the final R1=0.028 1, and wR2=0.050 5 for 3 137 observed reflections with I>2σ(I). For 2, a=0.845 59(4) nm, b=1.029 51(6) nm, c=1.155 52(7) nm, α=66.781(6)°, β=84.243(4)°, γ=81.170(5)°, V=0.912 62(9) nm3, Z=1, Dc=2.177 Mg·m-3, F(000)=586, the final R1=0.027 9, and wR2=0.051 1 for 3 120 observed reflections with I>2σ(I). Two coordination polymers display a two-dimensional anionic layer structure of [Ln2(pzdc)4(H2O)2]2-. The adjacent two-dimensional anionic layers are further linked by hydrogen bonding interactions between the H2prz2+, coordinated water molecules and lattice water molecules to form three-dimensional supramolecular structures. 1 and 2 exhibit intense corresponding characteristic luminescence for Eu(Ⅲ) and Tb(Ⅲ) in the solid state at room temperature. CCDC: 752631, 1; 752632, 2. |
