Ultrasonic synthesis of a 3D Ni(II) Metal–organic framework at ambient temperature and pressure: New precursor for synthesis of nickel(II) oxide nano-particles

Nano-particles of a Ni(II) metal–organic framework (MOF) with cubic building blocks and 1D open channels, i.e. {[Na16(Ni8L12)(H2O)20(H3O)4](CH3CN)(H2O)18.5}∞ (1) (H3L = 4,5-imidazoledicarboxylic acid) were synthesized by using ultrasonic method and characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), IR spectroscopy and elemental analysis. The effect of concentration of starting reagents on size and morphology of nano-structured compound 1 has also been investigated. Calcination of the bulk powder and nano-sized compound 1 at 700 °C under air atmosphere yields NiO nano-particles. Results show that the size and morphology of the NiO nano-particles are dependent upon the particles size of compound 1.

Graphical abstractNanoparticles of a Ni(II) metal–organic framework were synthesized by using ultrasonic method and characterized by scanning electron microscopy, X-ray powder diffraction, IR spectroscopy and elemental analyses. The effect of concentration of initial reagents on size and morphology has also been investigated. NiO nanoparticles were obtained by calcination of bulk powder and nanosized Ni(II) metal–organic framework at 700 °C.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Nanoparticles of a 3D Ni(II) metal–organic framework was synthesized. ► Particle sizes of the nanoparticles depend on the concentration of initial reagents. ► High concentrations of initial reagents increased particles size of compound 1. ► Calcination of the compound 1 at 700 °C yields NiO nanoparticles.