A molecular picture of metal ion solvation: Infrared spectroscopy of Cu+(NH3)n and Ag+(NH3)n in the gas phase

Kazuhiko Ohashi, Kazuya Inoue, Takuro Iino, Jun Sasaki, Ken Judai, Nobuyuki Nishi, Hiroshi Sekiya

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Infrared spectroscopy is applied to mass-selected Cu+(NH3)n and Ag+(NH3)n in the gas phase for investigating coordination chemistry of ammonia solvated noble-metal ions. The Cu+(NH3)3 ion prefers a three-coordinated structure but two-coordinated isomers are of growing importance until becoming predominant at n = 8 and 9. The first shell of the Ag+ ion is filled with four NH3 molecules and the resulting tetrahedral Ag+(NH3)4 complex is solvated by subsequent NH3 molecules through hydrogen bonding. A coordination number of 2 for Cu+ can be ascribed to extensive 4s-3d hybridization in Cu+, which causes the twofold linear coordination. A larger coordination number of 4 for Ag+ can be attributed to its larger ionic size and more importantly to inefficient 5s-4d hybridization in Ag+.

Original languageEnglish
Pages (from-to)71-76
Number of pages6
JournalJournal of Molecular Liquids
Issue number1-2
Publication statusPublished - Jul 20 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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