期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 49, 页码 15344-15346出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201609497
关键词
all-metal compounds; aromaticity; chemical bonding; structure elucidation; Zintl anions
资金
- National Natural Science Foundation of China [21171162, U1407101, 21573138]
- National Science Foundation [CHE-1361413]
- Spanish MINECO Project [CTQ2014-52525-P]
- Basque Country Consolidated Group [IT588-13]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1361413] Funding Source: National Science Foundation
Gas-phase clusters are deemed to be sigma-aromatic when they satisfy the 4n+2 rule of aromaticity for delocalized sigma electrons and fulfill other requirements known for aromatic systems. While the range of nvalues was shown to be quite broad when applied to short-lived clusters found in molecular-beam experiments, stability of all-metal cluster-like fragments isolated in condensed phase was previously shown to be mainly ascribed to two electrons (n=0). In this work, the applicability of this concept is extended towards solid-state compounds by demonstrating a unique example of a storable compound, which was isolated as a stable [K([2.2.2]crypt)](+) salt, featuring a [Au2Sb16](4-) cluster core possessing two all-metal aromatic AuSb4 fragments with six delocalized sigma electrons each (n=1). This discovery pushes the boundaries of the original idea of Kekule and firmly establishes the usefulness of the sigma-aromaticity concept as a general idea for both small clusters and solid-state compounds.
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