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An alkoxide cluster with 18 Li+ ions encapsulating two borate anions, [(tBuO)12Li18(Bo3)2]

Lookup NU author(s): Dr John ErringtonORCiD, Emeritus Professor Bill CleggORCiD


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The title compound, bis(borato)dodeca(tert-butoxo)octadecalithium, [Li18(BO3)2(C4H9O)12 ], is formulated conveniently as [{(tBuOLi)3(Li3BO3)}2( tBuOLi)6]. A central 12-membered ring and two outer six-membered rings are formed by alternating Li+ cations and alkoxide O atoms. Sandwiched between the central ring and each of the outer rings is a planar array of three further Li+ cations surrounding a [BO3]3- anion. Thus, the molecule consists of a cationic [Li18(OtBu)12]6+ cage encapsulating two borate anions. This compound is the first example of a structurally characterized polynuclear lithium borate, and a rare case of a lithium alkoxide cage with nuclearity greater than eight. All the alkoxide ligands are triply bridging, and the lithium ions have trigonal-planar, trigonal-pyramidal and fourfold coordination, all with major distortions from regular coordination geometry.

Publication metadata

Author(s): Tombul M, Errington RJ, Coxall RA, Clegg W

Publication type: Article

Publication status: Published

Journal: Acta Crystallographica Section C: Crystal Structure Communications

Year: 2003

Volume: 59

Issue: 6

Pages: m231-m233

Print publication date: 01/06/2003

ISSN (print): 0108-2701

ISSN (electronic): 1600-5759

Publisher: Wiley-Blackwell Publishing


DOI: 10.1107/S0108270103009636


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