Electrical measurements and thermal kinetics study of phenothiazine and a few of its derivatives

Achar, B. N. and Ashok, M. A. (2008) Electrical measurements and thermal kinetics study of phenothiazine and a few of its derivatives. Materials Chemistry and Physics, 108 (1). 8 - 15. ISSN 0254-0584

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Official URL: https://doi.org/10.1016/j.matchemphys.2007.08.039

Abstract

Electrical conductivity and thermal degradation studies of phenothiazine (PTZ), acetophenzazine dimaleate (APM), methdilazine hydrochloride (MDH) and mepazine hydrochloride monohydrate (MH) are reported. The activation energies are evaluated based on their electrical conductivity study conducted over the temperature range 30–150°C. These energies for PTZ, APM, MDH and MH are found to be 0.44, 0.41, 0.34 and 0.47eV, respectively. MH showed unusual temperature dependence metallic and semiconducting electrical conductivity. The parent compound and other derivatives showed semiconducting behaviors. The materials are analyzed for the kinetic parameters like the activation energies for decomposition and the Arrhenius pre-exponential factors in their pyrolysis region using Broido's, Coats–Redfern and Horowitz–Metzger methods. Using these factors and the standard equations thermodynamic parameters such as enthalpy, entropy and free energies are calculated. Thermogravimetric study on these phenothiazine derivatives in air indicated that their stabilities are in the order APM>MDH>PTZ>MH.

Item Type: Article
Uncontrolled Keywords: Organic compounds, Semiconductors, Thermogravimetric analysis, Electrical conductivity
Subjects: C Chemical Science > Chemistry
Divisions: Department of > Chemistry
Depositing User: manjula User
Date Deposited: 23 Aug 2019 11:07
Last Modified: 23 Aug 2019 11:07
URI: http://eprints.uni-mysore.ac.in/id/eprint/6985

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