Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 19 August 1994:
Vol. 265. no. 5175, pp. 1065 - 1067
DOI: 10.1126/science.265.5175.1065
Prev | Table of Contents | Next

Articles

Stable High-Order Molecular Sandwiches: Hydrocarbon Polyanion Pairs with Multiple Lithium Ions Inside and Out

Ari Ayalon 1, Andrzej Sygula 2, Pei-Chao Cheng 3, Mordecai Rabinovitz 1, Peter W. Rabideau 2, and Lawrence T. Scott 3

1 Department of Organic Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
2 Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-1802, USA.
3 Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02167-3860, USA.

Stable ten-component sandwich compounds have been characterized in which four lithium ions reside between two tetraanions derived from corannulene or its alkyl-substituted derivatives and four additional lithium ions decorate the exterior. In tetrahydrofuran solution, the four lithium ions inside the sandwich can exchange environments with the four external lithium atoms, but the two tetraanion decks of the sandwich never separate from one another on the time scale of nuclear magnetic resonance. Theoretical calculations point to a "stacked bowl" conformation and a low energy barrier for synchronous double inversion of the tetraanion bowls in the solvated sandwich compounds.

Submitted on March 11, 1994
Accepted on June 3, 1994


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Discrete sandwich compounds of monolayer palladium sheets..
T. Murahashi, M. Fujimoto, M.-a. Oka, Y. Hashimoto, T. Uemura, Y. Tatsumi, Y. Nakao, A. Ikeda, S. Sakaki, and H. Kurosawa (2006)
Science 313, 1104-1107
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)