Abstract
Three hexasodium transition metal sulfates, Na6M(SO4)4·2H2O (M = Fe, Co, Ni) were obtained by a dissolution and precipitation route and by hydrothermal reactions. The compounds were characterized by single crystal X-ray diffractions, UV/vis and IR spectroscopy, thermal analyses, and magnetization measurements. The title compounds all crystallize in the triclinic space group P1‾ (No. 2) with Z = 1 and lattice parameters: a = 6.0679(8), b = 6.8658(8), c = 10.1508(12) Å, β = 92.557(4)° for Na6Fe(SO4)4·2H2O; a = 6.0595(5), b = 6.8446(6), c = 10.1149(8), β = 92.548(2)° for Na6Co(SO4)4·2H2O; a = 6.0490(4), b = 6.8265(5), c = 10.0793(7), β = 92.5470(10)° for Na6Ni(SO4)4·2H2O, respectively. [M(SO4)4]6- anions are interconnected by hydrogen bonds to form two-dimensional layers in these structures. The solid-state UV/vis/NIR diffuse reflectance spectroscopy indicates that Na6M(SO4)4·2H2O (M = Co, Ni) are insulators. Magnetization experiments show a nearly linear temperature dependence of the inverse susceptibility down to 2 K, which indicates a paramagnetic behavior for all three compounds.
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