On structural phase transitions in 4-aminopyridinium fluoroborate, [4-NH 2C 5H 5N][BF 4]: differential scanning calorimetry, dielectric and infrared studies

Crystal structure of the 4-aminopyridinium tetrafluoroborate, [4-NH 2C 5H 5N][BF 4], has been determined at 293 K by means of X-ray diffraction as monoclinic space group, C2. The crystal shows a reach sequence of phase transition, four solid-solid transitions: at 250, 281, 388 and 485 K on heating....

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Bibliographic Details
Published inJournal of molecular structure Vol. 704; no. 1; pp. 177 - 187
Main Authors Czupiński, O, Jakubas, R, Pietraszko, A
Format Journal Article
LanguageEnglish
Published Elsevier B.V 18.10.2004
Subjects
Dielectric
Differential Scanning Calorimeter
Infrared
Phase transition
Plastic crystals
Tetrafluoroborate
X-ray
Plastic crystals
Infrared
Tetrafluoroborate
Differential Scanning Calorimeter
X-ray
Dielectric
Phase transition
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Summary:Crystal structure of the 4-aminopyridinium tetrafluoroborate, [4-NH 2C 5H 5N][BF 4], has been determined at 293 K by means of X-ray diffraction as monoclinic space group, C2. The crystal shows a reach sequence of phase transition, four solid-solid transitions: at 250, 281, 388 and 485 K on heating. Most of the phase transitions, except that at 388 K, are clearly of first order and classified as an ‘order-disorder’ type. The rotational disorder both of cations and anions was studied by differential scanning calorimetry, dielectric and infrared spectroscopy. The low temperature phase transitions are associated with plastic crystal behavior.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2004.01.066