Matrix Infrared Spectra of the NH3--HCN and NH3--(HCN)2 Complexes in Solid Argon

Article abstract of DOI:10.1021/j100347a022

The NH3--HCN complex has been observed and characterized in an argon matrix.It is a strongly bonded complex with C_3v geometry.New absorptions attributable to perturbed vibrations in each submolecule have been observed, especially a new red-shifted absorption ν^c₃(CH) for the perturbed C-H stretching fundamental with blue-shifted absorptions assigned to ν^c₁(CN), ν^c₂(HCN), and ν^c₂(NH3).A low-frequency absorption assigned to the librational motion of HCN in the complex was also observed and agrees well with calculated results.Comparison with the gas-phase spectrum shows that the matrix interaction stabilizes the complex.Spectra for the higher order 1:2 NH3--(HCN)2 complexes are presented, assigned, and compared to NH3--HCN and (HCN)2.