The molecular structure of sodium acetate was studied by mid infrared (MIR) spectroscopy, it is found that the infrared absorption modes of sodium acetate mainly include, CH3 asymmetric stretching vibration mode (ν■), CH3 symmetric stretching vibration mode (νsch3 sodium acetate), COO asymmetric stretching vibration mode (νASCO sodium acetate), COO symmetric stretching vibration mode (νscoo sodium acetate) and CH3 rocking vibration mode (ρCH3 sodium acetate),etc. Two dimensional mid infrared (2d-mir) spectroscopy were used to further studied the effect of temperature on the structure of sodium acetate. The results show that, in the temperature range of 303 K ~ 423 K, with the increase of measuring temperature, the absorption peaks of the main functional groups of sodium acetate (νasch3 acetate, νsch3 acetate, νascoo-sodium acetate, νscoo-sodium acetate and ρCH3 sodium acetate) have certain differences in the sensitivity to heat and the information of fast and slow change. This study extends the research scope of Mir and 2d-mir in the molecular structure and thermal stability of important organic acid salts (CH3COONa).
