Volume 80, Issue 6 pp. 676-681
research papers

Crystal structure of the incommensurate modulated high-pressure phase of the potassium guaninate monohydrate

A. A. Gaydamaka

Corresponding Author

A. A. Gaydamaka

V. S. Sobolev Institute of Geology and Mineralogy SB RAS, Koptyug Avenue 3, Novosibirsk, 630090 Russian Federation

A. A. Gaydamaka, e-mail: [email protected]Search for more papers by this author
S. V. Rashchenko

S. V. Rashchenko

V. S. Sobolev Institute of Geology and Mineralogy SB RAS, Koptyug Avenue 3, Novosibirsk, 630090 Russian Federation

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First published: 17 October 2024

Abstract

The crystal structure of the incommensurate modulated phase of potassium guaninate monohydrate has been solved on the basis of high-pressure single-crystal X-ray diffraction data. The modulated structure was described as a `mosaic' sequence of three different local configurations of two neighbouring guaninate rings. In contrast to known examples of incommensurate modulated organic compounds, the modulation functions of all atoms are discontinuous. This is the first example of the experimental detection of an incommensurate modulated crystal structure that can be modelled using the special `soliton mode' modulation function proposed by Aramburu et al. [(1995), J. Phys. Condens. Matter, 7, 6187–6196].

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