Abstract
We have investigated the spin-crossover behavior for one-dimensional complexes [Fe(trz) 3 (RSO 3 ) 2 (trz= triazole) and two-dimensional mixed-valence complexes (C n H 2n+1 ) 4 N[Fe II Fe III (dto) 3 ](dto=C 2 O 2 S 2 ). For the case of [Fe(4-NH 2 trz) 3 ](RSO 3 ) 2 , we have controlled Tc and the thermal hysteresis width of spin transition by using the isomerization of counter anion or the fastener effect between the alkyl chains of counter anions C n H 2n+1 SO 3 − . Moreover, we have synthesized a [Fe(Htrz) 3 ] film by using an ion-exchange film having SO 3 − , which shows the spin transition around room temperature. For the case of (C n H 2n+1 ) 4 N[Fe II Fe III (dto) 3 ](n=3,4), we have found a charge transfer phase transition between Fe II and Fe III around 120 K.
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