Polydentate tertiary amine aluminium hydride adducts: monomeric versus polymeric species

Abstract

Treatment of H₃AlNMe₃ with 1,3,5-trimethylhexahydro-1,3,5-triazine (tmtz) yields trigonal bipyramidal, monomeric [H₃Al(tmtz)₂], 1, or polymeric [H₃Al(tmtz)]_∞, 2, which undergo N–CH₂ cleavage at ca. 123 °C; nitrogen-atoms in 1 and 2 are in apical positions, as also established for polymeric [H₃Al(N,N,N′,N′-tetramethylpropylenediamine)]_∞, in accordance with ab initio molecular orbital calculations on the model system H₃Al(NH₃)₂.