Effect of the type of metal on the electrical conductivity and thermal properties of metal complexes: The relation between ionic radius of metal complexes and electrical conductivity

• Published in: Journal of molecular structure Vol. 1160; pp. 227 - 241
• Main Authors: Morgan, Sh.M., El-Ghamaz, N.A., Diab, M.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-05-2018
• Subjects: Co(II) and Ni(II) complexes; Conduction mechanism; Dielectric properties; Electrical conductivity; Thermal properties; Thermal properties; Conduction mechanism; Electrical conductivity; Co(II) and Ni(II) complexes; Dielectric properties
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2018.01.079

Co(II) complexes (1–4) and Ni(II) complexes (5–8) were prepared and characterized by elemental analysis, IR spectra and thermal analysis data. Thermal decomposition of all complexes was discussed using thermogravimetric analysis. The dielectric properties and alternating current conductivity were investigated in the frequency range 0.1–100 kHz and temperature range 300–660 K. The thermal activation energies of electrical conductivity (ΔE1 and ΔE2) values for complexes were calculated and discussed. The values of ΔE1 and ΔE2 for complexes (1–8) were found to decrease with increasing the frequency. Ac electrical conductivity (σac) values increases with increasing temperatures and the values of σac for Co(II) complexes are greater than Ni(II) complexes. Co(II) complexes showed a higher conductivity than other Ni(II) complexes due to the higher crystallinity as confirmed by X-ray diffraction analysis.
X-Ray diffraction patterns of powder forms for Co(II) and Ni(II) complexes. [Display omitted]
•Co(II) and Ni(II) complexes were prepared and characterized.•X-Ray diffraction of Co(II) complexes show polycrystalline phase.•Thermal activation energy of electrical conductivity for complexes were calculated.•The values of ac electrical conductivity increases with increasing temperatures.•The thermal activation energy of decomposition of complexes were calculated.