Coordination and ligand exchange dynamics of solvated metal ions

✍ Scribed by B.M. Rode; C.F. Schwenk; T.S. Hofer; B.R. Randolf

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 559 KB
• Volume: 249
• Category: Article
• ISSN: 0010-8545
• DOI: 10.1016/j.ccr.2005.03.032

✦ Synopsis

but an unusually large second solvation shell such as Au(I). Investigations of metal ions coordinated to ammonia ligands have shown that coordination to hetero-atoms can accelerate the ligand exchange reaction rates by several orders of magnitude, e.g. for Cu(II) and Ni(II). Simulations of ions in aqueous ammonia gave a very detailed picture of the complexity of species almost simultaneously present and illustrate the enormous difficulties encountered when trying to fit X-ray or neutron diffraction data for such systems. In general, ligand exchange rates situated in the picosecond range are far below the NMR scale, and as femtosecond laser pulse spectroscopy could not be applied so far to ionic solutions, accurate simulations have become a very important tool to access structure and dynamics of solvated ions. A number of video clips supplied on the Web as supporting material illustrates the processes occurring in solutions of the metal ions.