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Crystal structure, thermal, electric and magnetic study of [(CH2)7(NH3)2]CoCl2Br2

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Abstract

1,7-Heptanediammonium-dichlorodibromo-cobaltate (II), with molecular formula [(CH2)7(NH3)2]CoCl2Br2, has been synthesized. It is triclinic \( {\text{P}}\bar{1} \), a = 7.4042 (4) Å, b = 10.3484 (5) Å, c = 11.3554 (6) Å, α = 66.289 (3)° β = 78.425 (2)°, γ = 86.546 (3)°. Its crystal structure contains distorted tetrahedral [CoCl2Br2]2− anions and zigzag [(CH2)7(NH3)2]2+ cations which are connected via a network of hydrogen bonds. The largest difference in Co–Cl and Co–Br bond lengths are 0.081 Å and largest difference in Br–Co–Cl angles is 8.1°. The compound has been studied by thermal analysis, impedance spectroscopy and magnetic susceptibility. Thermal studies show three phase transitions at T 1 = 378 K, T 2 = 355 K, associated with solid–solid phase change and T 3 = 333.8 K ascribed to chain conformation and reorientation. Permittivity and ac conductivity as a function of temperature (300–395 K) and frequency (0.06 kHz < f < 100 kHz) is presented. AC conductivity is thermally activated in different phases. Conduction is mainly due to Cl− and Br− ion hopping in the high temperature range. Magnetic susceptibility yields an effective magnetic moment μ eff  = 4.43 BM and Curie–Weiss temperature, Θ = −4.7 K which confirm tetragonal symmetry of [CoCl4]2− and weak antiferromagnetic interaction at low temperatures.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, University of Cairo, Giza, Egypt

    M F Mostafa, S Abd-elal & A K Tammam

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  1. M F Mostafa
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  2. S Abd-elal
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  3. A K Tammam
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Correspondence to M F Mostafa.

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Mostafa, M.F., Abd-elal, S. & Tammam, A.K. Crystal structure, thermal, electric and magnetic study of [(CH2)7(NH3)2]CoCl2Br2 . Indian J Phys 88, 49–57 (2014). https://doi.org/10.1007/s12648-013-0371-8

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  • DOI: https://doi.org/10.1007/s12648-013-0371-8

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