27Al–13C coupling constants in trimethylaluminum dimer and its derivatives

Publisher Website
Google Scholar
Abstract
The 27Al–13C coupling constants in dimers of trimethylaluminum, dimethylaluminum chloride and bromide, and diethylaluminum chloride, and in the trimethylaluminum–diethylether complex were obtained by line shape analyses of the unresolved broadened signals of the proton‐decoupled 13C NMR spectra in a wide temperature range. There is a remarkable parallelism between 27Al–13C coupling constants in trimethylaluminum dimer and its derivatives and the 11B–1H coupling constants in diborane derivatives. This comes from the similarity in the electronic structure of the two types of electron deficient compounds, and can be accounted for in the framework of the Fermi contact mechanism for the spin coupling.