Repozytorium

Unprecedented transformation of [I- · I3-] to [I42-] polyiodides in the solid state : structures, phase transitions and characterization of dipyrazolium iodide triiodide.

Autorzy

Magdalena Węcławik

Przemysław Szklarz

Wojciech Medycki

Rafał Janicki

Anna Piecha-Bisiorek

Piotr Zieliński

Ryszard Jakubas

Rok wydania

2015

Czasopismo

Dalton Transactions

Numer woluminu

44

Strony

18447-18458

DOI

10.1039/C5DT02265G

Kolekcja

Naukowa

Język

Angielski

Typ publikacji

Artykuł

Streszczenie

Dipyrazolium iodide triiodide, [C3N2H5+]2[I·I3], has been synthesized and studied by means of X-ray diffraction, differential scanning calorimetry, dielectric measurements, and UV-Vis spectroscopy. Two reversible, solid–solid phase transitions (Imma (I) ↔ (II) ↔ Pbam (III)) at 254 K and 182/188 K respectively have been revealed. The anionic network experiences spectacular changes associated with a huge rebuilding of the inorganic network from [I·I3] to [I42−]. The low frequency dielectric relaxation process occurs in phase II with the activation energy of ca. 34 kJ mol−1. The molecular motion of the pyrazolium cations in [C3N2H5+]2[I·I3] has been studied by means of proton magnetic resonance studies (1H NMR). The ferroelastic properties of all phases have been confirmed by polarizing microscopy observations. The molecular mechanism of the phase transitions in the compound is proposed.

Adres publiczny

http://dx.doi.org/10.1039/C5DT02265G

Strona internetowa wydawcy

https://www.rsc.org/

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