Hydrothermal synthesis and crystal structure of a novel three-dimensional mixed-valence iron coordination polymer [(Fe2FeO2)-Fe-III-O-II(IN)(2)(ox)] (IN = isonicotinate, ox = oxalate)

摘要

A novel three-dimensional (3D) mixed-valence iron coordination polymer [(Fe2FeO2)-Fe-III-O-II(IN)(2)MOX)] (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) Angstrom, b = 18.528(2) Angstrom, c = 7.71117(9) Angstrom, beta = 103.168(2)A, V = 817.69(17) A(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 degreesC. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 18]