Two novel organic amine templated lanthanide sulfates: Layer H3DETA · [Nd(H2O)(SO4)3] and chain-like H3DETA · [Ho(H2O)2(SO4)3

Abstract

Two novel organic amine templated lanthanide sulfates, layer (H3DETA)[Nd(H2O)(SO4)3] (I) and chain-like (H3DETA)[Ho(H2O)2(SO4)3] (II), are hydrothermally synthesized by using diethylenetriamine (DETA) as template, and are structurally characterized by ICP, elemental analysis, X-ray single-crystal diffraction, X-ray powder diffraction, IR, and TG. Compound I is monoclinic with space group P21 and data of unit cell: a = 6.6518(13), b = 10.373(2), c = 11.091(2) A, β = 93.61(3)°, V = 763.7(3) A3, ρc = 2.421 g/cm3, μ(MoKα) = 3.885 mm−1, Z = 2, R1 = 0.0194 for 3312 reflections with Fo > 2σ(Fo). The Nd ions are nine-coordinated by one oxygen atom of coordinated water and eight oxygen atoms of sulfates. Compound I displays the layer structure constructed by linking Nd ions with three-linkage SO4 tetrahedra as the bridge (affording one coordinated vertex and coordinated edge). Compound II crystallizes in the monoclinic space group P21/c with unit cell data: a = 6.594(13) A, b = 14.783(3) A, c = 16.599(3) A, β = 93.47(3)°, V = 1614.2(6) A3, ρc = 2.454 g/cm3, μ(MoKα) = 5.37 mm−1, Z = 4, R1 = 0.0259 for 1815 reflections with Fo > 2σ(Fo). The Ho ions are eight-coordinated by two oxygen atoms of coordinated water and six oxygen atoms of sulfates. The straight chain-like structure of II is attained by alternatively arranging HoO8 polyhedra and two-linkage SO4 tetrahedra (affording two coordinated vertices). The TG results indicate that the two compounds experience three weight losses and lead to distinct residues: Nd2O3 for I and HoO(SO4)0.5 for II.