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The Vibrational Spectra of Cyanoacetic Acid and Sodium Cyanoacetate

Volume 26, Number 6 (Dec. 1972) Page 599-605

Sinha, Deepali; Katon, J.E.


The complete vibrational spectra of cyanoacetic acid and sodium cyanoacetate have been recorded. A tentative vibrational assignment for both molecules is proposed. The results appear to be most consistent with a hydrogen-bonded polymer structure of cyanoacetic acid. The marked effect of temperature on the infrared spectrum of the acid has been explained in terms of an order-disorder transition involving the position of the hydrogen atoms forming the hydrogen bonds in the crystal.