Sonochemical syntheses of a new fibrous-like nano-scale strontium(II) 3D coordination polymer; precursor for the fabrication of a strontium carbonate nanostructure

Nanostructures of a new three-dimensional Sr(II) coordination polymer, {[Sr(H2IDC)2(H2O)]·(H2O)}n (1) (H3IDC = 4,5-imidazoledicarboxylic acid), have been synthesized by a sonochemical process and characterized by field emission scanning electron microscopy (FESEM), X-ray powder diffraction (XRPD), FT-IR spectroscopy and elemental analyses. The effect of the concentration of the starting reagents on the size and morphology of nanostructured compound 1 has also been investigated. Structural determination of compound 1 reveals the Sr(II) ion is eight coordinated, bonded to one nitrogen atom and six oxygen atoms from the H2IDC− ligand and a water molecule. The thermal stability of compound 1 has been studied by thermal gravimetric (TG) and differential thermal analyses (DTA). Compound 1 polymerizes on heating the solid at 210 °C under a reversible crystal-to-crystal transformation, to form a new compound that is suggested to be the water-free compound, [Sr(H2IDC)2]n (2), that was characterized by powder X-ray diffraction techniques. SrCO3 nanostructures were simply synthesized by the solid-state transformation of compound 1 at 500 °C under an air atmosphere.

Nanostructures of a new 3D Sr(II) coordination polymer, {[Sr(H2IDC)2(H2O)]·(H2O)}n (1) (H3IDC = 4,5-imidazoledicarboxylic acid), have been synthesized by a sonochemical process and characterized by scanning electron microscopy, X-ray powder diffraction and FT-IR spectroscopy. SrCO3 nanostructures were simply synthesized by the solid-state transformation of compound 1 at 500 °C under an air atmosphere.Figure optionsDownload as PowerPoint slide