Author/Authors :
Sato، نويسنده , , Osamu and Miura، نويسنده , , Satoshi and Maruyama، نويسنده , , Hiroyuki and Zhang، نويسنده , , Yanjuan and Wu، نويسنده , , Dayu and Zhang، نويسنده , , Wen and Xu، نويسنده , , Haitao and Matsuda، نويسنده , , Ryotaro and Sun، نويسنده , , Haoling and Tao، نويسنده , , Jun، نويسنده ,
Abstract :
The magnetic and photo-magnetic properties of Co dinuclear compounds were studied. The Co compounds, [{Co(tpa)}2(dhbq)](BF4)3 · 2H2O and [{Co(tpa)}2(dhbq)](ClO4)3 · 2H2O, have the structure [(tpa)CoIII-LS–(μ-dhbq)3−–CoIII-LS(tpa)]3− (where LS, H2dhbq, tpa denote low-spin, 2,5-di-hydroxy-1,4-benzoquinone and tris(2-pyridylmethyl)amine, respectively) at room temperature. On heating, these compounds exhibit valence-tautomeric inter-conversion; [(tpa)CoIII-LS–(μ-dhbq)3−–CoIII-LS(tpa)]3− ⇆ [(tpa)CoII-HS–(μ-dhbq)2−–CoIII-LS(tpa)]3− (where HS denotes high-spin). Furthermore, both of these compounds exhibit photo-induced valence tautomerism at low temperature (<60 K). These results show that the electronic structures of these complexes can be controlled by modifying the counter anions.
