Repozytorium
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Kolekcje
Inne
Structural characterization, thermal, dielectric, vibrational properties and molecular motions in [C3N2H5]6[Bi4Br18].
Autorzy
Rok wydania
2009
Czasopismo
Journal of Solid State Chemistry
Numer woluminu
182
Strony
2949-2960
DOI
10.1016/j.jssc.2009.08.007
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
[C3N2H5]6[Bi4Br18]has been synthesized and characterized by the X-ray (at 293 and 110 K), calorimetric, dilatometric and dielectric measurements. At room temperature it crystallizes in the monoclinic space group, C2/m. A crystal structure consists of disordered imidazolium cations and ordered discrete tetramers of [Bi4Br18]6-. This compound reveals a rich polymorphism in a solid state. It undergoes three solid–solid phase transitions: from phase I to II at 426/423 K (heating–cooling), at 227 K and at 219.5/219 K. A clear dielectric relaxation process is found in the room temperature phase II. Infrared studies of the polycrystalline[C3N2H5]6[Bi4Br18] showed that the , (ring) and modes of the imidazolium cations appeared to be very sensitive to the phase transition. 1H NMR measurements confirmed a key role of the imidazolium cations in the phase transitions mechanisms at low temperatures.
Słowa kluczowe
Imidazolium, Bismuthate(III), Phase transition, Dielectric relaxation, Infrared, 1H NMR
Adres publiczny
https://doi.org/10.1016/j.jssc.2009.08.007
Strona internetowa wydawcy
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