Hydrothermal synthesis and crystal structure of a three-dimensional metal selenite containing double helical chains: Fe 3(H 2O)(SeO 3) 3

Abstract

A novel three-dimensional (3D) transition metal selenite Fe 3(H 2O)(SeO 3) 3 ( 1) has been hydrothermally synthesized and characterized by the elemental analyses, IR spectrum, TG analysis and the single-crystal X-ray diffraction. Compound 1 crystallizes in the triclinic system, space group P 1 ̄ , with a=8.0916(16) Å, b=8.2089(16) Å, c=8.5679(17) Å, α=69.21(3)°, β=62.74(3)°, γ=67.16(3)°, Z=2, and R 1[ I>2 σ( I)]=0.0379. Compound 1 exhibits an interesting 3D framework formed by {FeO 6} octahedra and {SeO 3} trigonal pyramids via the corner- and/or edge-sharing mode. Furthermore, compound 1 consists of left-handed and right-handed helical chains, which are further entangled to form the double helical chains.