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Group II metal complexes of the germylidendiide dianion radical and germylidenide anion

Chia, Siew-Peng, Carter, Emma ORCID:, Xi, Hong-Wei, Li, Yongxin and So, Cheuk-Wai 2014. Group II metal complexes of the germylidendiide dianion radical and germylidenide anion. Angewandte Chemie International Edition 53 (32) , pp. 8455-8458. 10.1002/anie.201404357

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The two-electron reduction of a Group 14-element(I) complex [RË⋅] (E=Ge, R=supporting ligand) to form a novel low-valent dianion radical with the composition [RË:]. 2− is reported. The reaction of [LGeCl] (1, L=2,6-(CH[DOUBLE BOND]NAr)2C6H3, Ar=2,6-iPr2C6H3) with excess calcium in THF at room temperature afforded the germylidenediide dianion radical complex [LGe]. 2−⋅Ca(THF)32+ (2). The reaction proceeds through the formation of the germanium(I) radical [LGe⋅], which then undergoes a two-electron reduction with calcium to form 2. EPR spectroscopy, X-ray crystallography, and theoretical studies show that the germanium center in 2 has two lone pairs of electrons and the radical is delocalized over the germanium-containing heterocycle. In contrast, the magnesium derivative of the germylidendiide dianion radical is unstable and undergoes dimerization with concurrent dearomatization to form the germylidenide anion complex [C6H3-2-{C(H)[DOUBLE BOND]NAr}Ge-Mg-6-{C(H)-NAr}]2 (3).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Wiley
ISSN: 1433-7851
Last Modified: 31 Oct 2022 10:58

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