A Stable Neutral Radical in the Coordination Sphere of Aluminum

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• 作者：Bin Li ; Dr. Subrata Kundu ; Dr. A. Claudia Stü ; ckl ; Prof. Hongping Zhu ; Helena Keil ; Dr. Regine Herbst-Irmer ; Prof. Dietmar Stalke ; Dr. Brigitte Schwederski ; Prof. Wolfgang Kaim ; Dr. Diego M. Andrada ; Prof. Gernot Frenking and Prof. Herbert W. Roesky
• 刊名：Angewandte Chemie International Edition
• 出版年：2017
• 出版时间：January 2, 2017
• 年：2017
• 卷：56
• 期：1
• 页码：397-400
• 全文大小：1443K
• ISSN：1521-3773

文摘

The neutral radical (Me₂-cAAC)₂AlCl₂ (2) is stabilized by cyclic (alkyl)(amino)carbenes (cAACs). Complex 2 was synthesized by reduction of the Me₂-cAAC:→AlCl₃ (1) adduct with KC₈ in the presence of another equivalent of Me₂-cAAC. The crystal structure of 2 shows that the Al−C bond lengths of the two carbenes bound to the Al center are considerably different, which is likely the result of intermolecular interactions. Quantum-chemical calculations from the gas phase give an equilibrium structure with identical Al−C bond lengths. Compound 2 exhibits monoradical character, which was confirmed by EPR measurements. A bonding analysis indicates that the unpaired electron resides mainly at the carbene carbon atoms. Compound 2 is an example for an unusual neutral Al radical.