Electric properties and internal dynamics of the [C6H18N2] SbCl5[C6H18N2] Cl2in intermediate temperature phase (part II)
Hołderna-Natkaniec K.1, Ouled Mohamed Sghaier M.2, Ławniczak P.3, Zdanowska-Frączek M.3, Woźniak-Braszak A.1, Chaabouni S.2
- 1Faculty of Physics, Adam Mickiewicz University, ul.Umultowska 85, Poznań, Poland
- 2Laboratory of Materials Science and Environment, Faculty of Sfax, BP 1171, Sfax, Tunisia
- 3Institute of Molecular Physics PAS, ul. M. Smoluchowskiego 17, Poznań, Poland
Polyhedron, 85, pp.131-136, 2015
DOI:: 10.1016/j.poly.2014.08.044
Abstract:
The electric conductivity of the [C6H18N2] SbCl5[C6H18N2] Cl2crystals (abbreviated as DEDA) has been studied by means of impedance analysis in a high temperature regime. The results have been correlated with ones obtained by means of CW 1H NMR analysis and the crystal structure of [C6H18N2] SbCl5[C6H18N2] Cl2. It was found that conductivity increases at the temperature which corresponds to the onset of pseudo-C3reorientational motion of the N,N-diethylethylenediammonium cation. The cations reorientations are accompanied by a chemical exchange and proton diffusion in the hydrogen bridge bonds. These results have shown that below 393 K the conduction of the crystals studied is a cooperative process involving both molecular motions prior to the proton exchange and migration along the hydrogen bonded chain (the Grotthus type diffusion mechanism of proton transport). The microscopic model of conductivity as well as the proton transfer path is proposed. © 2014 Elsevier Ltd. All rights reserved.
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