Degradation of Ba(DPM)(2) during storage in a desiccator for extended periods

We have investigated the degradation mechanism of Ba(DPM)(2), which has bee n stored in a desiccator for extended periods using thermogravimetry, FTIR and mass spectroscopy. TG analysis shows that the aged sample loses the ini tial weight significantly at relatively low temperatures, the rate of weigh t loss decreases above 380 degrees C, and large amounts of residue remain a t 550 degrees C. FTIR and mass spectroscopy show that Ba(DPM)(2) is easily attacked by CO2 and H2O in air, which results in the dissociation of chemic al bonds between the Ba ion and the ligand at low temperatures. This eventu ally enhances the oligomerization of Bn(DPM)(2) and the formation of carbon ates that exhibit low volatility and unstable thermal properties.