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

Robert Mulvey, Thomas Gentner, Alan Kennedy, Martyn P Coles, Matthew J Evans, Claire McMullin, Sam E Neale

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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.
Original languageEnglish
Pages (from-to)1390-1393
Number of pages4
JournalChemical Communications
Issue number9
Publication statusPublished - 7 Jan 2022


  • rubidium
  • caesium
  • aluminyls
  • synthesis
  • structures
  • reactivity
  • C-H bond activation
  • benzene

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