complexes 1 and 2 contain three O,N-coordinated o-iminobenzosemiquinonate(1-) radical anions with ferric centers in high-spin and low-spin configurations. The crystal structures of 1 and 2 were determined by X-ray diffraction at 100 and 293 K, and the electronic structures were established by various physical methods including Mossbauer (4-290 K) and variable-temperature (2-290 K) susceptibility measurements
据报道,有两个新的
铁(III)配合物,Fe(III)(LF *)3(1)和FeIII(L(t-Bu *))3(2),是取代的基于邻
氨基苯酚的
配体。配合物1和2包含三个O,N配位的o-亚
氨基苯并半醌酸(1-)自由基阴离子,其
铁心在高旋转和低旋转配置中。通过X射线衍射在100和293 K上确定1和2的晶体结构,并通过各种物理方法建立电子结构,包括Mossbauer(4-290 K)和可变温度(2-290 K)磁化率测量。电
化学测量(循环伏安法和方波伏安法)主要表明以
配体为中心的氧化还原过程。具有更多吸电子
氟取代基的配合物1在研究的整个温度范围(2-290 K)内均保持了三价
铁离子的高自旋特性,并表现出:如预期的那样,在三个自由基(SR = 1/2)与高自旋Fe(III)中心(SFe = 5/2)之间起作用的强反
铁磁耦合产生了St = 1作为基态。相反,对于配合物2 FeIII(L(t-Bu *