pyridines relative to pyrazoles. In the cobalt series, the Co(III/II) redox potential measured an average anodic shift of 0.16 V for each pyridine coordination site replaced by pyrazole, while only a slight shift was observed for the Fe(III/II) couple. Solution magnetic susceptibility measurements showed a general shift toward a high-spin ground state as pyridine was replaced by coordinated pyrazoles. The
摘要两个具有通式[Co(L)2] 2+和[Fe(L)2] 2+的配合物,其中L表示三齿
配体2,2':6'; 2''-叔
吡啶(L 1),6-(N-
吡唑基)-
2,2'-联吡啶(L 2); 制备并表征了2,6-双(N-
吡唑基)
吡啶(L 3)。研究了这两个系列化合物的电子性质,它们是配位
吡啶相对于
吡唑的逐步变化的函数。在
钴系列中,Co(III / II)氧化还原电势测得每个被
吡唑取代的
吡啶配位位点的平均阳极位移为0.16 V,而Fe(III / II)对仅观察到轻微的位移。溶液的磁化率测量结果表明,随着
吡啶被配位
吡唑取代,大体上向高自旋基态转变。
钴系列的μeff为3.2 B. 对双自旋(L 1)的M.接近自旋交越点,而[Co(L 2)2] 2+和[Co(L 3)2] 2+的μeff分别在4.5和4.6下测得BM,分别。对于
铁系列,[Fe(L 1)2] 2+和Fe(L 2)2] 2+表现出稳定的抗磁低自旋态。但是,[Fe(L