title: A Stable Neutral Radical in the Coordination Sphere of Aluminum.
abstract: 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 KC8in 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.
authors.affiliation: Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany.|State Key Laboratory of Physical Chemistry of Solid Surface, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P.R. China.
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.affiliation: Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany.
authors.forename: Subrata
authors.initials: S
authors.lastname: Kundu
authors.affiliation: Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany.
authors.forename: A Claudia
authors.initials: AC
authors.lastname: Stückl
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surface, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P.R. China.
authors.forename: Hongping
authors.initials: H
authors.lastname: Zhu
authors.affiliation: Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany.
authors.forename: Helena
authors.initials: H
authors.lastname: Keil
authors.affiliation: Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany.
authors.forename: Regine
authors.initials: R
authors.lastname: Herbst-Irmer
authors.affiliation: Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany.
authors.forename: Dietmar
authors.initials: D
authors.lastname: Stalke
authors.affiliation: Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany.
authors.forename: Brigitte
authors.initials: B
authors.lastname: Schwederski
authors.affiliation: Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Kaim
authors.affiliation: Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032, Marburg, Germany.
authors.forename: Diego M
authors.initials: DM
authors.lastname: Andrada
authors.affiliation: Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032, Marburg, Germany.|Donostia International Physics Center (DIPC), P.K. 1072, 20080, Donostia, Euskadi, Spain.
authors.forename: Gernot
authors.initials: G
authors.lastname: Frenking
authors.affiliation: Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany.
authors.forename: Herbert W
authors.initials: HW
authors.lastname: Roesky
keywords: aluminum radicals; bonding analysis; cyclic alkyl(amino) carbenes; theoretical calculations