abstract49
Inorg. Chem., 41 (17), 4567 -4573, 2002. 10.1021/ic025730h S0020-1669(02)05730-0
Web Release Date: July 27, 2002
Copyright © 2002 American Chemical Society
Solution and Solid-State Structure of the Anion [Ag2{closo-CB11H12}4]2-
Mark A. Fox, Mary F. Mahon,* Nathan J. Patmore, and Andrew S. Weller*
Department of Chemistry, University of Bath, Bath BA2 7AY, U.K., and Department of Chemistry, University Science Laboratories, South Road, Durham DH1 3LE, U.K.
Received May 20, 2002
Abstract:
Addition of the carbene 1,3-dimesitylimidazol-2-ylidene (IMes) to a toluene solution of Ag[closo-CB11H12] results in the formation of the complex [(IMes)2Ag]2[Ag2{closo-CB11H12}4], the anionic component of which contains two silver(I) centers bridged by two carboranes in addition to one terminally bound carborane on each metal, in the solid-state. Comparison of the observed 11B{1H} NMR chemical shifts of [(IMes)2Ag]2[Ag2{closo-CB11H12}4] or Ag[closo-CB11H12] with [NBu4][closo-CB11H12] in CD2Cl2 demonstrates that the silver ion interacts significantly with the cage in solution. Theoretical investigations using the ab initio/GIAO/NMR method of [closo-CB11H12]– and Na[closo-CB11H12] as model geometries for the silver salts support experimental evidence for these Ag···{BH} interactions in solution.