Cobalt(II) Metal-organic Framework as Scintillating Material

  • Idongesit Justina Mbonu Department of Chemistry, Federal University of Petroleum Resources, Nigeria
  • Charles Chisom Mbonu Department of Physics, University of Uyo, Nigeria
Keywords: Cobalt (II), Metal-organic framework, Scintillator


Novel cobalt(II) metal-organic framework was grown by the reaction of a methanol solution of 8-hydroxyquinoline and benzoic acid with aqueous solution of cobalt(II) chloride hexahydrate using slow solvent evaporation. The X-ray luminescence of the synthesized compound showed vibronic peaks: one with λmax at 489 nm and shoulders at 424 and 531 nm, respectively, which compare favorably with best  organic scintillators such as anthracene –447 nm and stilbene –410 nm currently in application.  The elemental analysis of the metal complex suggests a metal to ligands ratio of 1:1:1. Conductance measurement shows a nonelectrolytic nature of the synthesized compound. The SEM studies give the surface morphology of the complex. The observed emission bands with different dynamics in response to temperature change suggest that the Co-MOF exhibits scintillation properties. Electronic spectrum and magnetic moment studies were used to determine the geometry of the Co-MOF molecule. Thermal analysis data reported displayed the extent of stability of the Co-MOF compound. PXRD data revealed the nanocrystalline nature of the complex. Energy resolution peak observed at 2535 KeV, suggest the synthesized compound can be used as a scintillator.


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Three-dimensional optimization network of mononuclear Co-MOF incorporating 8-hydroxyquinoline and benzoic acid with high stability and strong luminescence emission was synthesized and characterized. (A) Showing an optimized  3D mode of Co-MOF (B) shows the ball and stick X-ray molecular structure of Co-MOF (C) Co-MOF molecule showing different binding sites with surface.
How to Cite
Mbonu, I. J., & Mbonu, C. C. (2020). Cobalt(II) Metal-organic Framework as Scintillating Material. Journal of the Indonesian Chemical Society, 3(2), 87.