Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 207, Issue -, Pages 313-320Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2018.09.041
Keywords
2-Nitroaniline; Crystal structure; Phase transition; Elementary graph-set descriptor; Vibrational spectroscopy; Second harmonic generation
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Funding
- ILTSR PAS [K15]
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A phase transition in new compound 2-nitroanilinium nitrate, (H2NA)NO3, was found. A symmetry lowering from orthorhombic, Pmn2(1), to monoclinic one, P2(1), at 249 K is observed. During the phase transition, the H2NA(+) and nitrate ions displace from the mirror plane in high-temperature phase. As a result, hydrogen bonding network constructed by the ammonio group and NO3- anion is changed. Especially, a bifurcated hydrogen bond disappears. Mathematical operations using both elementary and hydrogen bond graph-set descriptors were used for the first time to describe a mechanism of phase transition. Changes in hydrogen bonding network were also studied by means of vibrational spectroscopy. Band shift associated with stretching and bending vibrations of the ammonio group indicates that the energy of intermolecular interactions rises along with temperature decrease. SHG response for the studied compound is higher than KDP, I-(H2NA)NO3 = 1.1 center dot I-KDP although a decay of the signal was observed due to instability of the sample. (C) 2018 Elsevier B.V. All rights reserved.
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