Department of Chemistry, University at Albany, State University of New York, Albany, NY 12222 (USA).
Angew Chem Int Ed Engl. 2014 Jan 3;53(1):140-5. doi: 10.1002/anie.201308090. Epub 2013 Nov 8.
The first members of a new class of supramolecular organometallic compounds with mixed-alkali-metal cluster cores, LiK5 and Li3 K3 , sandwiched between two four-fold reduced corannulene decks are prepared and fully characterized. The triple-decker supramolecular anions, (C20 H10 (4-) )(LiK5 )(6+) (C20 H10 (4-) ) and (C20 H10 (4-) )(Li3 K3 )(6+) (C20 H10 (4-) ) , illustrate a record ability of bowl-shaped and highly charged corannulene to provide all its sites, five benzene rings fused to a central five-membered ring, for binding of six alkali-metal ions. The previously unseen engagement of the hub-site of C20 H10 (4-) in lithium binding is accompanied by unprecedented shifts up to -24 ppm in (7) Li NMR spectra. The discussion of product formation mechanism, augmented by calculations, is provided.
首次制备并充分表征了具有混合碱金属簇核的新型超分子有机金属化合物的首批成员，LiK5 和 Li3 K3 夹在两个四价还原的corannulene 甲板之间。三夹层超分子阴离子 (C20 H10 (4-) )(LiK5 )(6+) (C20 H10 (4-) ) 和 (C20 H10 (4-) )(Li3 K3 )(6+) (C20 H10 (4-) ) 表明，碗状和高电荷 corannulene 具有前所未有的能力，可以提供其所有位点，即 5 个苯环融合到中心的 5 元环上，用于结合 6 个碱金属离子。以前未见的 C20 H10 (4-) 中心位点在锂结合中的参与伴随着 (7)Li NMR 光谱中高达 -24 ppm 的前所未有的位移。提供了对产物形成机制的讨论，计算结果增强了讨论。
