The conducting spin-crossover compound combining Fe(II) cation complex   with TCNQ in a fractional reduction state
  The radical anion salt [Fe{HC(pz)3}2](TCNQ)3 demonstrating conductivity and spin-crossover transition (SCO) associated with Fe(II) complex cation subsystem has been synthesized and structurally characterized. A pronounced change of the dc resistivity and a robust broadening of the EPR signal triggered by the SCO transition are found. Enhanced EPR line broadening is interpreted in terms of cross relaxation between the TCNQ and Fe(II) spin subsystems 
Yuri N. Shvachko, Denis V. Starichenko, Aleksander V. Korolyov, Eduard   B. Yagubskii, Alexander I. Kotov, Lev I. Buravov, K...
cond-mat.mtrl-sci