Cyclic (Alkyl)(Amino)Carbene-Stabilized Aluminum and Gallium Radicals Based on Amidinate Scaffolds

Mujahuddin M Siddiqui; Samya Banerjee; Sanjoy Bose; Samir Kumar Sarkar; Sandeep K Gupta; Johannes Kretsch; Nico Graw; Regine Herbst-Irmer; Dietmar Stalke; Sayan Dutta; Debasis Koley; Herbert W Roesky

doi:10.1021/acs.inorgchem.0c01913

Cyclic (Alkyl)(Amino)Carbene-Stabilized Aluminum and Gallium Radicals Based on Amidinate Scaffolds

Inorg Chem. 2020 Aug 17;59(16):11253-11258. doi: 10.1021/acs.inorgchem.0c01913. Epub 2020 Aug 3.

Affiliations

¹ Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, Göttingen 37077, Germany.
² Department of Chemical Sciences, Indian Institute of Science Education and Research, Mohanpur, Kolkata 741246, India.

PMID: 32799492
DOI: 10.1021/acs.inorgchem.0c01913

Abstract

Neutral, mononuclear aluminum and gallium radicals, stabilized by cyclic (alkyl)(amino)carbene (cAAC), were synthesized. LMCl₂ upon reduction with KC₈ in the presence of cAAC afforded the radicals LMCl(cAAC), where L = PhC(N^tBu)₂ and M = Al (1), Ga (2). The radicals were characterized by X-ray crystallography, electron paramagnetic resonance (EPR) spectroscopy, and mass spectrometry. EPR, SQUID measurement, and computational calculations confirmed paramagnetism of the radicals with unpaired spin mainly on cAAC.