The ir spectrum of K<sub>2</sub>C<sub>2</sub>O<sub>4</sub>·H<sub>2</sub>O is reported at liquid nitrogen temperature (LNT). On the basis of present work and earlier Raman studies, the frequencies at 3400, 3250, 1615, 1600, 1577, 1487, 1311, 902, 780, 605, 522, 449, 353, and 305 cm<sup>−1</sup> have been assigned to the fundamental internal modes of C<sub>2</sub>O<sub>4</sub> and H<sub>2</sub>O groups. In addition, the wagging and rocking modes of bonded water have been assigned unambiguously at 737 and 646 cm<sup>−1</sup>, respectively. Compared with the spectrum at room temperature, the spectral changes on cooling to LNT are as follows: (1) The bands at 522 and 1311 cm<sup>−1</sup> each show splitting into two bands; (2) the librational modes of crystalline H<sub>2</sub>O show considerable increase in peak intensities accompanied by sharpening and a shift of about +20 cm<sup>−1</sup>; and (3) among the internal modes of H<sub>2</sub>O the symmetric stretching mode at 3250 cm<sup>−1</sup> shows greater enhancement than the other two modes.

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