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Double Concave Cesium Encapsulation by Two Charged Sumanenyl Bowls.
Title Double Concave Cesium Encapsulation by Two Charged Sumanenyl Bowls.
Authors Spisak, S.N.; Wei, Z.; Rogachev, A.Yu; Amaya, T.; Hirao, T.; Petrukhina, M.A.
Journal Angew Chem Int Ed Engl
DOI 10.1002/anie.201610696
Abstract

The controlled reaction of Na and Cs, two alkali metals of different ionic sizes and binding abilities, with sumanene (C21 H12 ) affords a novel type of organometallic sandwich [Cs(C21 H11(-) )2 ](-) , which crystallized as a solvent-separated ion pair with a [Na(18-crown-6)(THF)2 ](+) cation (where THF=tetrahydrofuran). The unprecedented double concave encapsulation of a metal ion by two bowl-shaped sumanenyl anions in [Cs(C21 H11(-) )2 ](-) was revealed crystallographically. Evaluation of bonding and energetics of the remarkable product was accomplished computationally (B2PLYP-D/TZVP/ZORA), providing insights into its formation.