Organically directed bimetallic sulfates based on the radii and coordination number: Synthesis, structure and characterization

A series of organically directed bimetallic sulfates with one- and two-dimensional structures have been synthesized hydrothermally. The 2D structures with formulas (C2H10N2)(2)[(Fe2FeII)-Fe-III(SO4)(6)(H2O)(4)]center dot 2H(2)O, I, (C2H10N2)(2)[(Fe2CdII)-Cd-III(SO4)(6)(H2O)(4)]center dot 2H(2)O, II, and (C2H10N2)(2)[(Fe2NiII)-Ni-III(SO4)(6)(H2O)(4)]center dot 2H(2)O, III, have identical brick-wall layers constructed from infinite ferrinatrite-type {Fe-2(SO4)(3)}(n) chains jointed by transition metal ions M2+ (M = Fe, Cd, Ni); the 1D structures with the compositions [C2N2H10][Fe3O(SO4)(6)La(H2O)(6)]center dot 3H(2)O, IV, [C2N2H10][Fe3O(SO4)(6)Ce(H2O)(6)]center dot 3H(2)O, V, and [C4N2H12](1.5)[Fe3O(SO4)(6)Cd(H2O)(5)]center dot 2H(2)O, VI, possess sulfated trinuclear iron oxo clusters that are interconnected by Ln(3+) or Cd(2+)cations to extended straight or zigzag chains. The assembly of iron sulfate, resulting from the increase of the radii and coordination numbers of second metal centers, was modulated to afford a 1D chain or 0D cluster and further extended to form distinct 2D layer or 1D cluster-containing chain. The magnetic measurements reveal the presence of ferromagnetism for I at low temperature and two paramagnetic regions for VI.