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A Stable Neutral Radical in the Coordination Sphere of Aluminum
Author(s) -
Li Bin,
Kundu Subrata,
Stückl A. Claudia,
Zhu Hongping,
Keil Helena,
HerbstIrmer Regine,
Stalke Dietmar,
Schwederski Brigitte,
Kaim Wolfgang,
Andrada Diego M.,
Frenking Gernot,
Roesky Herbert W.
Publication year - 2017
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.201609101
Subject(s) - carbene , electron paramagnetic resonance , chemistry , unpaired electron , adduct , intermolecular force , coordination sphere , bond length , crystallography , crystal structure , alkyl , radical , molecule , catalysis , organic chemistry , nuclear magnetic resonance , physics
The neutral radical (Me 2 ‐cAAC) 2 AlCl 2 ( 2 ) is stabilized by cyclic (alkyl)(amino)carbenes (cAACs). Complex 2 was synthesized by reduction of the Me 2 ‐cAAC:→AlCl 3 ( 1 ) adduct with KC 8 in the presence of another equivalent of Me 2 ‐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.