The Vibrational Spectra of the Formate, Acetate, and Oxalate Ions

Abstract

The infrared spectra of the formate, acetate, and oxalate ions have been obtained for both the solid and aqueous solution. The Raman spectra of these ions with depolarization ratios have been obtained in aqueous solution. Vibrational assignments have been made which differ slightly for the acetate ion and more markedly for the oxalate ion from earlier work. The depolarization ratios confirm Fonteyne’s assignment for the formate ion.

Structures, spectra, and DNA-binding properties of mixed ligand copper(II) complexes of iminodiacetic acid: The novel role of diimine co-ligands on DNA conformation and hydrolytic and oxidative double strand DNA cleavage

“…On complex formation with copper(II) this band disappears indicating deprotonation of the acid followed by its co-ordination through carboxylate oxygen atoms. This is further supported by the shifts [37] in m as (COO) (1700 cm À1 ) and m s (COO) (1400 cm À1 ) bands of H 2 imda, respectively, to 1638-1625 and 1407-1385 cm À1 in the complexes. Further, the difference between these two bands Dm [m as (COO) À m s (COO)] of 238-247 cm À1 is typical of unidentate mode of coordination of carboxylate to copper(II) in all the complexes, which is confirmed by the X-ray crystal structures of the complexes.…”

A spectroscopic study of the mineral paceite (calcium acetate)

“…Upon band component analyses a complex series of bands was elucidated and are assigned as described below. The small broad peak present at 1340 cm -1 for Ca(CH 3 COO) 2 .0.5H 2 O and 1350 cm -1 for Ca(CH 3 COO) 2 .H 2 O is due to the symmetric methyl bending vibrations δ s (CH 3 ) of the acetate anion. The antisymmetric methyl bending (δ' as (CH 3 )) vibration is observed at 1406 and 1413 cm -1 for the half-hydrated and monohydrated calcium acetate species.…”

“…The region for the large difference in this region which corresponds to large interplanar lattice spacings is most likely due to differences in the amount of water coordinated to the calcium acetate molecules. Although both patterns have been identified as a calcium acetate hydrate, the calcium acetate crystals have an X-ray pattern closely matched to a monohydrated calcium acetate (Ca(CH 3 COO) 2 .H 2 O). Whilst the calcium acetate formed through forced evaporation has a diffraction pattern identical to a crystal structure that shares one water molecule between every two calcium acetate molecules (Ca(CH 3 COO) 2 .0.5H 2 O)…”

“…Step 4 at 595°C CaCO 3 → CaO + CO 2 The differential thermogravimetric curve of the calcium acetate powder synthesized via forced evaporation, shown in figure 2(a), shows four distinctive mass loss peaks. The mass loss peaks at 137 °C and 175 °C are due to the loss of water molecules.…”

“…The vibrational spectroscopy of acetates in both aqueous media and solid state have been comprehensively studied over a long period of time [1][2][3][4]. Though one of the major difficulties associated with studying the spectroscopy of acetates is the large amount of variation in the reported literature [5].…”