X-ray absorption spectroscopy study of the In-solution structure of Ni2+, Co2+, and Ag+ solvates in acetonitrile including multiple scattering contributions

Citation
S. Diaz-moreno et al., X-ray absorption spectroscopy study of the In-solution structure of Ni2+, Co2+, and Ag+ solvates in acetonitrile including multiple scattering contributions, J PHYS CH B, 104(49), 2000, pp. 11794-11800
Citations number
56
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
15206106 → ACNP
Volume
104
Issue
49
Year of publication
2000
Pages
11794 - 11800
Database
ISI
SICI code
1520-6106(200012)104:49<11794:XASSOT>2.0.ZU;2-L
Abstract
An X-ray absorption spectroscopy study of the in-solution structures of the acetonitrile solvates of Ni2+, Co2+ and Ag+ cations has been performed. Fo r the first two cations an octahedral arrangement of the acetonitrile molec ules around the central metal atom has been found, while in the case of the Ag+ a tetrahedral arrangement has been found. In all cases the acetonitril e molecules were bonded to the central cation through, the nitrogen atom at distances R(Co2+-N) = 2.11 Angstrom, (Ni2+-N) 2.07 Angstrom, R(Ag+-N)= 2.2 7 Angstrom. The unusual high amplitude of the second peak in the radial dis tribution function, corresponding to the carbon atom of the cyanide group, for the three studied solvates, indicated that the angle formed by M-N-C wa s very close to 180 degrees. The quantitative analysis of the most intense multiple scattering contributions among those involving N atoms, C atoms fr om the cyanide group and C atoms form the methyl group provided values of M n+-C-1 and Mn+-C-2 coordination distances as well as an estimate of coordin ation angles.