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Fac vs Mer Selection in Octahedral Complexes of the N-Benzyl-Substituted Triazolylpyridine Diad with Labile Metal Ions (Zinc(II), Iron(II), and Nickel(II))
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-02-08 00:00:00 , DOI: 10.1021/acs.cgd.7b01495
Mona AshrafKhorasani 1 , Nan Wu 1 , Olivier Fleischel 1 , Gabriele Schatte 1 , Anne Petitjean 1
Affiliation  

Pseudo-octahedral complexes built on chelating ligands offer valuable isomeric properties such as the formation of fac vs mer isomers, and Λ vs Δ enantiomers. This article discusses factors guiding the fac vs mer selection of complexes built from the triazolyl-pyridine platform bearing a benzyl substituent, in conjunction with labile metal ions such as zinc(II), iron(II), and nickel(II). Critical parameters that are explored include the geometrical flexibility of the individual metal ion, and the nature of the counteranion. In essence, it was observed that ions which can withstand significant distortions in their first coordination sphere, such as zinc(II), generally prefer forming the mer isomer irrespective of the counteranion, whereas ions with more restricted geometry, such as iron(II), are directed either to a fac arrangement by small, tetrahedral anions such as tetrafluoroborate or perchlorate or to a mer organization by counteranions of lower symmetry, such as triflate. The molecular interactions operating the selection are discussed. Interestingly, such iron(II) complexes are prime candidates for spin crossover behavior; hence, understanding their isomeric selection may assist in guiding the design of solid-state magnetic materials.

中文翻译:

Fac vs MerN-苄基取代的三唑基吡啶二烯与不稳定金属离子(锌(II),铁(II)和镍(II))的八面体配合物中的选择

建立在螯合配体上的伪八面体络合物提供了有价值的异构特性,例如fac vs mer异构体和ΛvsΔ对映异构体的形成。本文讨论的因素引导FAC VS聚体从三唑基-吡啶平台带有苄基取代基内置络合物的选择,在具有不稳定的金属离子,例如锌(II),铁(II)和镍(II)一起使用。探索的关键参数包括单个金属离子的几何柔性以及抗衡阴离子的性质。本质上,可以观察到离子,其可以承受显著失真在他们的第一配位圈,如锌(II),一般喜欢在形成聚体异构体,而不考虑抗衡阴离子,而具有更局限性的离子(例如铁(II))则通过小的四面体阴离子(例如四氟硼酸根或高氯酸根)直接导向fac排列,或者通过较低对称性的平衡阴离子(例如,正离子)指向mer结构。琐事。讨论了操作选择的分子相互作用。有趣的是,这类铁(II)络合物是自旋交叉行为的主要候选物。因此,了解它们的异构体选择可能有助于指导固态磁性材料的设计。
更新日期:2018-02-08
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