14696-82-3Relevant articles and documents
The [ICNI]+ cation: A combined experimental and theoretical study. Reaction of [ICNI]+[AsF6]- with CsN3
Klapoetke, Thomas M.
, p. 553 - 557 (2007/10/03)
(Iodocyano)iodine hexafluoroarsenate, [ICNI]+[AsF6]-, containing the linear 22-valence-electron [ICNI]+ cation was synthesized either by the reaction of iodine cyanide with [I3]+[AsF6]- or directly from ICN, I2 and AsF5 and characterized by chemical analysis, IR, Raman and 19F NMR data. A combined vibrational (IR, Raman) and theoretical study revealed the [ICNI]+ cation to be linear, the preference of the linear over the bent structure can easily be understood in terms of hyperconjugative interactions in the cationic species [natural bond order (NBO) analysis]. The molecular structure of the [ICNI]+ cation was computed semiempirically (Austin Model 1, AMI; reparameterization of AM1, PM3) and ab initio at the Hartree-Fock (HF/6-31G*) and correlated RMP2 (RMP, restricted Moller-Plesset) and RMP4(SDQ) levels of theory using quasi-relativistic pseudo-potentials (LANL2DZ) for the icdine atoms. The computed structural parameters at the highest level applied are: Cx, symmetry, RMP4(SDQ), d(I-C) = 2.001, d(C≡N) = 1.167, d/(N-I) = 2.021 A. The N-I bond dissociation enthalpy for [ICN-I]+ was calculated ab initio at the electron-correlated RMP2 level of theory as 207.4 kJ mol-1. The metathetical reaction of [ICNI]+[AsF6]- with CsN3 in SO2ClF afforded IN3, Cs+[AsF6]- and ICN.