Syntheses and Characterization of Two Isonicotinic Acid-Containing Lanthanide Complexes With Different 1-D Polycationic Chains

Abstract

Two new isonicotinic acid-containing lanthanide complexes, [Eu(HL)3(H2O)2]2n·(nH5O2)(nHgCl5)(2nHgCl4)·(2nH2O) (1) and [GdL2(H2O)4]nnCl (2) (HL = isonicotinic acid), have been synthesized via hydrothermal reactions and structurally characterized by X-ray single-crystal diffractions. Complex 1 crystallizes in the space group C2/c of the monoclinic system with four formula units in a cell: a = 24.2129(9), b = 20.7750(8), c = 15.2980(6) Å, β = 128.32°, V = 6037.1(4) Å3, C36H47Cl12Eu2Hg3N6O20, Mr = 2214.89, Dc = 2.437 g/cm3, S = 0.994, μ(MoKα) = 10.253 mm–1, F(000) = 4140, R = 0.0425 and wR = 0.0800. Complex 2 crystallizes in the space group Pbcn of the orthorhombic system with four formula units in a cell: a = 8.947(4), b = 19.616(9), c = 10.086(5) Å, V = 1770.1(14) Å3, C12H16ClGdN2O8, Mr = 508.97, Dc = 1.910 g/cm3, S = 1.009, μ(MoKα) = 3.938 mm–1, F(000) = 988, R = 0.0276 and wR = 0.0674. Both complexes are characteristic of infinite one-dimensional (1-D) polycationic chain-like structures.