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  • Title: Calix[4]pyrrole Aluminate: A Planar Tetracoordinate Aluminum(III) Anion and Its Unusual Lewis Acidity.
    Author: Ebner F, Wadepohl H, Greb L.
    Journal: J Am Chem Soc; 2019 Nov 13; 141(45):18009-18012. PubMed ID: 31665601.
    Abstract:
    Tetracoordinate aluminum(III) anions are generally tetrahedral and non-Lewis acidic. Herein, we describe the first planar tetracoordinate aluminum anion. The anion is isolated in its free form, representing a new "anti-van't Hoff/Le Bel" case. Despite its negative charge, it remains Lewis acidic and permits the formation of various unique adducts, e.g., a dianionic p-block metal hydride. Turning an inert spectator anion into a Lewis acid by planarization verifies theoretical predictions made 40 years ago, ultimately connects "anti-van't Hoff/Le Bel" structure with reactivity, and pushes further the field of geometrically enhanced p-block element reactivity.
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