Two novel FeII-oxalate architectures: Solvent-free synthesis, structures, thermal and magnetic studies

•Two novel FeII-oxalate frameworks have been synthesized.•Heterometallic 1 features a 3D architecture with a pto topology.•Homometallic 2 exhibits a pillar-layered architecture with a hms topology.•Thermal and magnetic properties have been studied.

Two novel FeII-oxalate framework with the formulas of [NH4][FeIILi3(C2O4)3] (1) and [NH4]2[FeII(C2O4)2]·H2O (2) have been prepared by an oxalic acid flux approach and structurally characterized by IR, elemental analysis, thermogravimetric analysis, single-crystal and powder X-ray diffraction. Heterometallic compound 1 displays a three-dimensional (3D) framework with a pto topology, while homometallic compound 2 features a pillar-layer architecture with a hms topology. Thermal analysis indicates that the two compounds can be stable up to 300 °C and 200 °C, respectively. Magnetic investigations suggest that the FeII ions in 1 and 2 exhibit weak magnetic exchange interactions.

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