Abstract
A novel three-dimensional (3D) mixed-valence iron coordination polymer [Fe 2 IIIFe IIO 2(IN) 2(ox)] (IN=isonicotinate, ox=oxalate) ( 1) has been hydrothermally synthesized by using two different anionic ligands and characterized by elemental analysis, IR spectrum, electron spin resonance (ESR), X-ray photoelectron spectrum (XPS), thermogravimetric analysis (TGA) and single crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic, space group P2(1)/ c with a=5.8774(7) Å, b=18.528(2) Å, c=7.7117(9) Å, β=103.168(2) A ̊ , V=817.69(17) Å 3, Z=2, and R 1=0.0321 ( wR 2=0.0777). The Fe(II) and Fe(III) centers in 1 both exhibit a distorted octahedral coordination geometry and are bridged by the IN and oxalate groups into a covalently bonded 3D metal–organic network. TGA showed that the 3D network possesses a good stability up to 291 °C.
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