AI Article Synopsis
- The radical anion salt [Fe{HC(pz)3}2](TCNQ)3 shows both conductivity and a spin-crossover transition linked to its Fe(II) complex structure.
- The compound was synthesized and analyzed at various temperatures, revealing unusual quasi-two-dimensional conductivity characteristics.
- Notable changes in resistivity and EPR signal intensity before the spin-crossover transition at 445 K indicate complex interactions between the TCNQ and Fe(II) spin subsystems.
Article Abstract
The radical anion salt [Fe{HC(pz)3}2](TCNQ)3 demonstrates conductivity and spin-crossover (SCO) transition associated with Fe(II) complex cation subsystem. It was synthesized and structurally characterized at temperatures 100, 300, 400, and 450 K. The compound demonstrates unusual for 7,7,8,8,-tetracyanoquinodimethane (TCNQ)-based salts quasi-two-dimensional conductivity. Pronounced changes of the in-plane direct-current resistivity and intensity of the electron paramagnetic resonance (EPR) signal, originated from TCNQ subsystem, precede the SCO transition at the midpoint T* = 445 K. The boltzmannian growth of the total magnetic response and structural changes in the vicinity of T* uniquely show that half [Fe{HC(pz)3}2] cations exist in high-spin state. Robust broadening of the EPR signal triggered by the SCO transition is interpreted in terms of cross relaxation between the TCNQ and Fe(II) spin subsystems.
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| http://dx.doi.org/10.1021/acs.inorgchem.6b01829 | DOI Listing |
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