| Abstract: Two new lanthanide coordination polymers [Er(dpa)(pya)(H2O)]n (H2dpa=1,1′-biphenyl-2,2′-dicarboxylate; Hpya=isonicotinic acid) and [Nd2(pya)6(H2O)4]n have been hydrothermally synthesized and characterized by elemental analysis, IR, and single crystal X-ray diffraction. Both crystals of the title compounds crystallized in the monoclinic system, space group P21/n with lattice parameters of compound 1: a=0.8830(3) nm, b=1.058 5(3) nm, c=2.089 1(6) nm, β=98.429(4)°, Dc=1.883g·cm-3, V=1.931 4(10) nm3, Z=4 and those of compound 2: a=0.968 9(4) nm, b=1.978 3(9) nm, c=1.164 2(6) nm, β=112.106(7)°, Dc=1.756 g·cm-3, V=2.067 5(17) nm3, Z=4. The result of the X-ray crystallography analysis exhibits that the metal La3+ ion centers of the compounds occupy a distorted square anti-prism coordination site. Carboxylic groups of the ligands present chelate and bridging modes. The structures of the two compounds exhibit a novel alternating La (Ⅲ) chain. CCDC: 1: 225278, 2: 225274. |
