Exposing elusive cationic magnesium-chloro aggregates in aluminate complexes through donor control

Etienne V. Brouillet, Alan R. Kennedy, Konrad Koszinowski, Ross McLellan, Robert E. Mulvey, Stuart D. Robertson

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The cationic magnesium moiety of magnesium organohalo aluminate complexes, relevant to rechargeable Mg battery electrolytes, typically takes the thermodynamically favourable dinuclear [Mg2Cl3]+ form in the solid-state. We now report that judicious choice of Lewis donor allows the deliberate synthesis and isolation of the hitherto only postulated mononuclear [MgCl]+ and trinuclear [Mg3Cl5]+ modifications, forming a comparable series with a common aluminate anion [(Dipp)(Me3Si)NAlCl3]. By pre-forming the Al-N bond prior to introduction of the Mg source, a consistently reproducible protocol is reported. Usage of the green solvent 2-methyltetrahydrofuran in place of THF in the context of Mg/Al battery electrolyte type complexes is also promoted.
Original languageEnglish
Pages (from-to)5590-5597
Number of pages8
JournalDalton Transactions
Issue number13
Early online date22 Feb 2016
Publication statusPublished - 7 Apr 2016


  • post-lithium ion batteries
  • magnesium
  • inorganic metal salt

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