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A Raman Spectral Study of the Dehydration of Calcium Oxalate Monohydrate

Volume 42, Number 4 (June 1988) Page 701-703

Duval, D.; Condrate, R.A.

Calcium oxalate monohydrate (CaC2O4·H2O) is a major constituent in human urinary calculi. Vibrational spectral studies for this compound provide useful structural information concerning such calculi. Shippey measured the vibrational spectra of calcium oxalate monohydrate at room temperature, and made band assignments for these spectra. Recently, Duval and Condrate measured the Raman spectra of this compound through the P21/n-I2/m phase transition at 45°C, and were able to make band assignments for the two phases. They noted that the high-temperature phase coexisted with the low-temperature phase in powdered samples at room temperature. This study systematically explained the temperature dependence of band features below the dehydration temperature. The current study investigates the Raman spectra for calcium oxalate monohydrate at higher temperatures and through the dehydration temperature. Structural information is also obtained at higher temperatures for anhydrous calcium oxalate that is thermodynamically stable.