The preparation of CdO nanowires from solid-state transformation of a layered metal-organic framework

A new coordination polymer formulated as [C8H10CdO7]n·4H2O has been prepared via a hydrothermal procedure by using 1,4-benzenedicarboxylic (p-BDC) and CdII salt as starting materials. The structure was determined by single-crystal X-ray diffraction and the result shows that the complex crystallizes in orthorhombic system, space group Pcca, with Mr=402.62, a=7.293(2) Å, b=9.980(3) Å, c=19.889(6) Å, V=1447.6(8) Å3, Z=4, Dc=1.847 g/cm3, F(000)=808, μ(MoKα)=1.559 mm−1, R=0.0478, wR=0.1150, GOF=1.199. It displays a neutral layered framework along ab plane constructed by hydrogen-bonding interaction through infinite zigzag chains. Its thermal decomposition and solid-state transformation course between 30 and 550 °C was recorded by TG curve and XRD pattern, respectively. Interestingly, it is found that at higher temperature the crystal material was converted to uniform CdO nanowires, suggesting an effective and reasonable complex-precursor procedure for preparing one-dimensional crystalline nanomaterials.