Amine-Templated One-Dimensional Metal Sulfates Including a Mixed-Valent Fe Compound with a Half-Kagome Structure

Organically templated metal sulfates are relatively new. Six amine‐templated transition‐metal sulfates with different types of chain structures, including a novel iron sulfate with a chain structure corresponding to one half of the kagome structure, were synthesized by hydro/solvothermal methods. Amongst the one‐dimensional metal sulfates, [C 10 N 2 H 10 ][Zn(SO 4 )Cl 2 ] ( 1 ) is the simplest, being formed by corner‐linked ZnO 2 Cl 2 and SO 4 tetrahedra. [C 6 N 2 H 18 ][Mn(SO 4 ) 2 (H 2 O) 2 ] ( 2 ) and [C 2 N 2 H 10 ][Ni(SO 4 ) 2 (H 2 O) 2 ] ( 3 ) have ladder structures comprising four‐membered rings formed by SO 4 tetrahedra and metal–oxygen octahedra, just as in the mineral kröhnkite. [C 4 N 2 H 12 ][V III (OH)(SO 4 ) 2 ]⋅H 2 O ( 4 ) and [C 4 N 2 H 12 ][VF 3 (SO 4 )] ( 5 ) exhibit chain topologies of the minerals tancoite and butlerite, respectively. The structure of [C 4 N 2 H 12 ][H 3 O][Fe III Fe II F 6 (SO 4 )] ( 6 ) is noteworthy in that it corresponds to half of the hexagonal kagome structure. It exhibits ferrimagnetic properties at low temperatures and the absence of frustration, unlike the mixed‐valent iron sulfate with the full kagome structure.