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Published on: July 27, 2022
Temperature-induced reversible structural phase transition and X-ray diffuse scattering in 2-amino-3-nitropyridinium
Tamara J Bednarchuk1, Dorota Kowalska1, Vasyl Kinzhybalo1
1Institute of Low Temperature and Structure Research, PO Box 1410, Wrocław 50-950, Poland.
Abstract:
The novel polar material 2-amino-3-nitropyridinium hydrogen sulfate, C5H6N3O2(HSO4) (abbreviated as 2A3NP-HS), was obtained and structurally characterized by means of single-crystal X-ray diffraction. At room temperature, 2A3NP-HS crystallizes as a non-centrosymmetric disordered phase (I) in the orthorhombic Pna21 space group. On cooling below 298 K, 2A3NP-HS undergoes a reversible phase transition to phase (II) with the monoclinic non-centrosymmetric P21 space group. This transition might be classified as an `order-disorder' type. The structural details in both phases are analysed. Additionally, for phase (I), in the 304-365 K temperature range, diffuse scattering was found to be present in the form of elongated streaks parallel to the a* direction. This can be unravelled when implementing a short-range order affecting anionic cationic ribbons occurring in the structure, with correlations acting both in the a-direction and in the bc-plane. The results of Monte Carlo simulations, adapting a two-dimensional Ising-type model, reveal the formation of domains, which are b-elongated and thin along a. Locally, the stacking of the ribbons in the domains reflects the ordered arrangement observed in the low-temperature monoclinic phase (II).
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