Inorganic Chemistry, Vol.45, No.20, 8452-8458, 2006
Organically directed iron sulfate chains: Structural diversity based on hydrogen bonding interactions
Six organically directed 1-D iron sulfates hydrated and hydrolyzed to different extents have been prepared hydrothermally. [C2H10N2](1.5)[Fe(SO4)(3)]center dot 2H(2)O (I), [C2H10N2][Fe(SO4)(2)(OH)]center dot H2O (II), [C6H18N2](0.5)[Fe(SO4)(2)(H2O)(2)] (III), and [C6H18N2](0.5)[Fe-2(SO4)(H2O)(4)(OH)]center dot H2O (V) possess the linear topological structures observed in ferrinatrite, sideronatrite, krohnkite, and copiapite minerals, respectively. [C4H12N2][Fe-2(SO4)(3)(OH)(2)(H2O)(2)]center dot H2O (IV) shows a novel linear structure that can be regarded as a hybrid of the tancoite and butlerite types. [C6N4H22](0.5)[Fe(SO4)(2)-(OH)]center dot 2H(2)O (VI) adopts a cis configuration, compared with II, to give a rare inorganic helical iron sulfate chain which is a new member of the organically directed transitional metal sulfates. The results reveal that the starting molar proportion of the reactants and the type of amines are critical for the structural motif. There is an obvious relationship between the constitution of chains and the type of amino groups, involving the amount of N-H center dot center dot center dot O hydrogen bonds.