Discrimination of Octahedral versus Trigonal Bipyramidal Coordination Geometries of Homogeneous Ti
<sup>IV</sup>
, V
<sup>V</sup>
, and Mo
<sup>VI</sup>
Amino Triphenolate Complexes through Nitroxyl Radical Units
作者:Elena Badetti、Vega Lloveras、Francesco Romano、Rosalia Di Lorenzo、Jaume Veciana、José Vidal‐Gancedo、Cristiano Zonta、Giulia Licini
DOI:10.1002/ejic.201600649
日期:2016.11
radicals in the corresponding metal complexes. In these systems, dipolar interactions among the organic radicals are strongly dependent on the geometry assumed in solution: a |Δms| = 2 transition is observed when the geometry of the complexes is octahedral, whereas no signal is detected with trigonal bipyramidal geometries.
通过电子顺磁共振(EPR)光谱合成并研究了一种新的稳定的含自由基配体以及相应的V V,Ti IV和Mo VI配合物。为了实现此目标,已开发出一种新的三酚胺(TPA)配体衍生化的策略。这允许在相应的金属络合物中有效嵌入三个TEMPO(2,2,6,6-四甲基-1-哌啶基氧基)自由基。在这些系统中,有机基团中偶极相互作用强烈地依赖于几何形状在溶液中假定:一个|Δ米小号| 当配合物的几何形状为八面体时,观察到= 2跃迁,而对于三角双锥体几何,则未检测到信号。