Abstract
Solvothermal treatment of metal sulfate and oxalic acid in DMF solution generated three isostructural 3D homonchiral (10,3)-a metal oxalates {(Me2NH2)3(SO4)}2[MII2(ox)3] (M = Fe in 1, Co in 2, Ni in 3) in which D3-symmetric supramolecular cation {(Me2NH2)6SO4}4+ formed via electrostatic attractions and 24 N−H···O hydrogen bonds functions as template. The overall structure of 1−3 can be described as interpenetration of coordinate [MII2(ox)3]2− and supramolecular {(Me2NH2)3(SO4)}+ (10,3)-a nets. Thermal analyses reveal that compounds 1−3 show two-stepped decomposition via metal sulfate intermediates. The magnetic behavior of 1 and 2 exhibits antiferromagnetic coupling between M(II) ions, and magnetic ordering is observed in 2.
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