نبذة مختصرة : The aluminyl compounds [ M {Al(NON Dipp )}] 2 (NON Dipp = [O(SiMe 2 NDipp) 2 ] 2– , Dipp = 2,6- i Pr 2 C 6 H 3 ), which exist as contacted dimeric pairs in both the solution and solid states, have been converted to monomeric ion pairs and separated ion pairs for each of the group 1 metals, M = Li, Na, and K. The monomeric ion pairs contain discrete, highly polarized Al– M bonds between the aluminum and the group 1 metal and have been isolated with monodentate (THF, M = Li and Na) or bidentate (TMEDA, M = Li, Na, and K) ligands at M . The separated ion pairs comprise group 1 cations that are encapsulated by polydentate ligands, rendering the aluminyl anion, [Al(NON Dipp )] − “naked”. For M = Li, this structure type was isolated as the [Li(TMEDA) 2 ] + salt directly from a solution of the corresponding contacted dimeric pair in neat TMEDA, while the polydentate [2.2.2]cryptand ligand was used to generate the separated ion pairs for the heavier group 1 metals M = Na and K. This work shows that starting from the corresponding contacted dimeric pairs, the extent of the Al– M interaction in these aluminyl systems can be readily controlled with appropriate chelating reagents.
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