Thermo-electrochemical generation capabilities of octahedral spin crossover complexes of Mn(II), Fe(II) and Co(II) with N-donor ligands and benzoate counter ion

Hasnan, Megat Muhammad Ikhsan and Abdullah, Norbani and Said, Suhana Mohd and Salleh, Faiz and Hussin, S.A. Mat and Shah, Noraisyah Mohamed (2018) Thermo-electrochemical generation capabilities of octahedral spin crossover complexes of Mn(II), Fe(II) and Co(II) with N-donor ligands and benzoate counter ion. Electrochimica Acta, 261. pp. 330-339. ISSN 0013-4686

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Official URL: https://doi.org/10.1016/j.electacta.2017.12.145

Abstract

Spin crossover ionic complexes have shown potential as efficient thermoelectrochemical materials which are capable of converting electrochemical energy into electrical potential in the presence of a temperature gradient. In this work, we have measured the Seebeck coefficient, ionic conductivity and the electrical power output of three proposed spin crossover ionic complexes. These three complexes are [Mn(cyclam)(L)2]2+, [Co(cyclam)(L)2]2+ and [Fe(cyclam)(L)2]2+ with transition metal core, N-donor ligands and benzoate counter ion. It was found that the Seebeck coefficients and ionic conductivities of the proposed ionic complexes are highly dependent on the choice of transition metal. This dependency is expected to be most likely due to the selective agglomeration formed by the complexes through the Jahn-Teller effect of the ionic complexes. The ionic conductivity of these ionic complexes with KI-KI3 in presence of TBATFB without optimization were already three order magnitude higher than a control redox solution of KI-KI3 in the presence of low molarity of TBATFB. Consequently, this new perspective of agglomeration formation may provide a molecular design tool for synthesising spin crossover metal complexes for high performance thermo-electrochemical electricity generation.

Item Type: Article
Uncontrolled Keywords: Thermo-electrochemical cells; Spin crossover; Seebeck; Ionic conductivity; Agglomeration
Subjects: Q Science > QD Chemistry
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Faculty of Science > Dept of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 08 Aug 2019 07:25
Last Modified: 08 Aug 2019 07:25
URI: http://eprints.um.edu.my/id/eprint/21916

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