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Dinickelaferrocene: A Ferrocene Analogue with Two Aromatic Nickeloles Realized by Electron Back‐Donation from Iron
Author(s) -
Huang Zhe,
Zheng Yu,
Zhang WenXiong,
Ye Shengfa,
Deng Liang,
Xi Zhenfeng
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202007222
Subject(s) - ferrocene , aromaticity , metallocene , chemistry , crystallography , atomic orbital , redox , crystal structure , computational chemistry , inorganic chemistry , electron , molecule , organic chemistry , electrochemistry , polymerization , physics , electrode , quantum mechanics , polymer
The first example of ferrocene analogues with two transition‐metal metallole ligands of the general formula ( η 5 ‐C 4 R 4 M) 2 Fe in a sandwich structure are reported. Specifically, dinickelaferrocene 2 , a type of dimetallametallocene, is efficiently synthesized from the reaction of dilithionickelole 1 with FeBr 2 or FeCl 2 , presumably via a redox process, and is subjected to detailed experimental (single‐crystal X‐ray structural analysis, ICP‐OES, magnetometry, 57 Fe Mössbauer, XPS) and theoretical (MOs, CDA, NICS, ICSS, and AICD) characterizations. Unlike ferrocene and its Cp ligands, the aromaticity of dinickelaferrocene and its nickelole ligands is accomplished by electron back‐donation from the Fe 3d orbitals to the π* orbitals of nickelole. Taken together, this work describes a new class of metallaferrocene sandwich complexes and provides a novel approach to effect aromaticity that will contribute to further development of metallocene chemistry.