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A Zwitterionic Heterobimetallic Gold–Iron Complex Supported by Bis(N-Heterocyclic Imine)Silyliumylidene
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-08-19 , DOI: 10.1002/anie.202108146
Franziska Hanusch 1 , Dominik Munz 2, 3 , Jörg Sutter 3 , Karsten Meyer 3 , Shigeyoshi Inoue 1
Affiliation  

The facile synthesis of the first bis-N-heterocyclic imine-stabilized chlorosilyliumylidene 1 is reported. Remarkably, consecutive reaction of 1 with PPh3AuCl and K2Fe(CO)4 gives rise to the unique heterobimetallic complex 1,2-(MesNHI)2-C2H4-ClSiAuFe(CO)4 (4). The overall neutral complex 4 bears an unusual linear Si−Au−Fe structure and a rare anagostic interaction between the d10-configured gold atom and a CH bond of the mesityl ligand. According to the computational analysis and 57Fe Mössbauer spectroscopy, the formal Fe-oxidation state remains at −II. Thus, the electronic structure of 4 is best described as an overall neutral—yet zwitterionic—heterobimetallic “Si(II)+-Au(I)+-Fe(-II)2−”-silyliumylidene complex, derived from double anion exchange. The computational analysis indicates strong hyperconjugative back donation from the gold(I) atom to the silyliumylidene ligand.

中文翻译:


双(N-杂环亚胺)亚硅基负载的两性离子异双金属金铁配合物



报道了第一个双-N-杂环亚胺稳定的氯甲硅烷基亚基1的简便合成。值得注意的是, 1与 PPh 3 AuCl 和 K 2 Fe(CO) 4的连续反应产生了独特的异双金属配合物 1,2-( Mes NHI) 2 -C 2 H 4 -ClSiAuFe(CO) 4 ( 4 )。整体中性配合物4具有不寻常的线性Si−Au−Fe结构以及d 10配置的金原子和异丙叉基配体的CH键之间罕见的抑制相互作用。根据计算分析和57 Fe 穆斯堡尔谱,Fe 的形式氧化态保持在 -II。因此, 4的电子结构最好描述为整体中性的两性离子异双金属“Si(II) + -Au(I) + -Fe(-II) 2− ”-silyliumylidene络合物,源自双阴离子交换。计算分析表明金(I)原子对亚硅基配体有强烈的超共轭回馈作用。
更新日期:2021-10-12
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