Organically templated rare earth sulfates with three-dimensional and layered structures

Abstract

Amine-templated rare earth sulfates of the compositions: [Ln₂(H₂O)₂(SO₄)₅][C₂N₂H₁₀]₂, I, with Ln=La, Pr or Nd, [Nd₂(SO₄)₄(H₂O)₂][C₄N₂H₁₂], II, [Ln₂(SO₄)₄][C₂N₂H₁₀], III, with Ln=La or Nd, [La₂(SO₄)₄][C₃N₂H₁₂], IV and [Ln₂(SO₄)₄(H₂O)₄][C₆N₂H₁₄]₂[C₂N₂H₈][SO₄][H₂O]₃, with V, Ln=La, Pr or Nd, have been synthesized under hydrothermal conditions. Both I and II have three-dimensional architectures with I possessing eight-membered apertures surrounding 16-membered apertures, and II having 12 membered apertures. Both III and V have interesting layered structures with LnO₃ layers possessing (6, 3) net topology and the amine located in between the layers. V has a layered structure wherein the SO₄ tetrahedra and the LnO₉ polyhedra join together to form (4, 4) net sheets, with two different amines as well as the sulfate ions residing in the interlamellar space.