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Rubidium and caesium aluminyls: synthesis, structures and reactivity in C-H bond activation of benzene.

Thomas X GentnerMatthew J EvansAlan R KennedySamuel E NealeClaire L McMullinMartyn P ColesRobert E Mulvey
Published in: Chemical communications (Cambridge, England) (2022)
Expanding knowledge of low valent aluminium chemistry, rubidium and caesium aluminyls are reported to complete the group 1 (Li-Cs) set of metal aluminyls. Both compounds crystallize as a contacted dimeric pair supported by M⋯π(arene) interactions with a pronounced twist between aluminyl units. Density functional theory calculations show symmetrical bonding between the M and Al atoms, with an Al centred lone-pair donating into vacant Rb and Cs orbitals. Interestingly, despite their structural similarity the Cs aluminyl enables C-H bond activation of benzene, but not the Rb aluminyl reflecting the importance of the alkali metal in these heterobimetallic systems.
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