Structural and magnetic characterization of [Fe(Cp∗)2]DR-DCNQI, R=Me and Ph

The synthesis and magnetic properties of [Fe(Cp * ) 2 ]DR-DCNQI, R=Me and Ph, are presented and discussed. The crystal structure for the [Fe(Cp * ) 2 ]DMe-DCNQI compound consists of an array of parallel stacks of alternating cations [Fe(Cp * ) 2 ] + and anions DMe-DCNQI', ..D + A - D + A - D + A - ... Strong intrachain DA FM interactions dominate the magnetic behavior of [Fe(Cp * ) 2 ]DMe-DCNQI and the competition between those interactions and weak AFM interchain interactions results in the observation of a metamagnetic behavior at low temperatures, with T N =3 K and H C =2.5 kG, at 1.8 K. In the case of [Fe(Cp * ) 2 ]DPh-DCNQI, weak AFM interactions dominate the magnetic behavior of this compound.