Vibrational analysis of the (VO(O2)2NH3)- ion

Abstract

The infrared spectra of the solid complex NH4 (VO(O2)2NH3) were obtained. Due to the complicated structure of the diperoxo (VO(O2)2NH3)− ion, normal coordinate analysis was introduced in order to make quantitative assignments for all vibrations of the ion under Cs, symmetry. The ν(VO), νs(O-O) and νas(O-O) are assigned at 960, 895 and 880 cm−1, respectively. The values of the force constants for all bonds and angle bends were calculated and their values discussed in view of the bonding and structure of the diperoxo ion. The electronic absorption band at 317nm of the (VO(O2)2NH3)− ion is assigned to the charge-transfer transition of the O22− → V5+ type.