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