Dinuclear aminotroponiminate compounds containing two dialkyl aluminum substituents

Reaction of the n-propyl-bridged bis (aminotroponimine) H-2[(iPr)TP] with v arious dialkylaluminum hydrides R2AlH, in hexane, led to novel bimetallic c ompounds of composition [(R2Al)(2){(iPr)TP}] (R = Me, Et, iBu). Depending o n the size of the substituents R bound to the Al centers the complexes crys tallize either in a cisoid (R = Me) or a transoid (R = iBu) conformation. T he steric crowding at the aluminum centers is also observed in solution.