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Ligand substitution effects on the charge transport properties of the spin crossover complex [Fe(Htrz)1+y−x (trz)2−y (NH2trz) x ](BF4)y·nH2O

Soroceanu, Ion and Lupu, Simona-Lacramioara and Rusu, Ionela and Piedrahita-Bello, Mario and Salmon, Lionel and Molnár, Gábor and Demont, Philippe and Bousseksou, Azzedine and Rotaru, Aurelian Ligand substitution effects on the charge transport properties of the spin crossover complex [Fe(Htrz)1+y−x (trz)2−y (NH2trz) x ](BF4)y·nH2O. (2020) Journal of Physics : Condensed Matter, 32 (26). 264002. ISSN 0953-8984

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Official URL: https://doi.org/10.1088/1361-648X/ab7ba2

Abstract

The complex dielectric permittivity of a series of spin crossover complexes, with variable ligand stoichiometry [Fe(Htrz)1+y−x (trz)2−y (NH2trz) x ](BF4) y centerdotnH2O, has been investigated as a function of temperature in a wide frequency range. In each compound, a substantial drop of the conductivity and permittivity is evidenced when going from the low spin to the high spin state, albeit with decreasing amplitude for increasing ligand substitution (i.e. for increasing x). The deconvolution of the dielectric spectra using the Havriliak–Negami equation allowed to extract the dipole and conductivity relaxation times, their distributions as well as the dielectric strengths in both spin states. Remarkably, no clear correlation appears between the conductivity changes and the lattice properties (Debye temperature) in the dilution series. We rationalize these results by considering the dimensionality of the system (1D), wherein the charge transport occurs most likely by hopping along the [Fe(Rtrz)3] n n+ chains.

Item Type:Article
HAL Id:hal-02570870
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Universitatea Stefan cel Mare Suceava - USU (ROMANIA)
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Funders:
European Commission - Federal Univeristy of Toulouse and the Occitanie Region
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Deposited On:03 Jul 2020 08:59

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