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Structure and properties of [2-NH2C5H4NH][SbCl4] and [2-NH2C5H4NH][SbBr4].
Autorzy
Rok wydania
2004
Czasopismo
Journal of Physics-Condensed Matter
Numer woluminu
16
Strony
8155-8172
DOI
10.1088/0953-8984/16/46/004
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The crystal structures of [2-NH2C5H4NH][SbCl4] (2-APyHSbCl4) and [2-NH2C5H4NH][SbBr4] (2-APyHSbBr4) are determined at 100 K. Both compounds crystallize in the monoclinic space group: P 21/c. The structure is composed of SbX4− (X = Cl,Br) ions which form infinite chains through the crystal via halogen linkages. The structural phase transformations are detected by the differential scanning calorimetry and dilatometric techniques: at 402 K, close to continuous, and at 412 K, clearly discontinuous, in 2-APyHSbCl4 and 2-APyHSbBr4, respectively. Dielectric relaxation studies in the frequency range between 1 kHz and 25 MHz indicate reorientations of the 2-aminopyridinium (2-APyH) cations in both compounds in the low temperature phases. The proton NMR second moment, M2, and spin–lattice relaxation time, T1, for 2-APyHSbCl4 and 2-APyHSbBr4 measured between 78 and 430 K reveal the in-plane reorientation of the 2-APyH cations. The possible mechanism of the phase transitions in the title crystals is discussed on the basis of the results presented.
Adres publiczny
http://dx.doi.org/10.1088/0953-8984/16/46/004
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