Rubidium and caesium aluminyls: synthesis, structures and reactivity in C-H bond activation of benzene
Thomas X Gentner1, Matthew J Evans2, Alan R Kennedy1
1Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK. r.e.mulvey@strath.ac.uk.
Abstract:
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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