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Structural characterization and properties of bis (1,4-H2-1,2,4-triazolium) pentachlorobismuthate (III) and cocrystal of ammonium chloride with tris (1,4-H2-1,2,4-triazolium) hexachlorobismuthate (III).
Autorzy
Rok wydania
2014
Czasopismo
Numer woluminu
71
Strony
69-74
DOI
10.1016/j.poly.2013.12.038
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The crystal structure of two novel 1,2,4-triazolium analogues: (TBC) and (TCBA), isolated from one system, has been determined. The structure of TCBA is built up from cationic substructures consisting of 1,2,4-triazolium and ammonium cations, , and discrete octahedral anions. The two-component cationic sublayer of TCBA is unique in the case of halobismuthates(III). TCBA adopts the triclinic space group () at 100 K. Differential scanning calorimetry (DSC) and dilatometric measurements showed that it undergoes reversible first-order phase transition (PT) at 420/405 K (heating/cooling) governed by an ’order–disorder’ mechanism. The crystal structure of TBC (Cmca at 100 K) contains the chains of cis-connected octahedra and a hydrogen-bonded array of 1,2,4-triazolium cations. The statistical disorder of the 1,2,4-triazolium cations is found at low temperatures. No PT is detected between 100 and 400 K in TBC.
Słowa kluczowe
A. halides, X-ray diffraction, dielectric properties
Adres publiczny
http://dx.doi.org/10.1016/j.poly.2013.12.038
Strona internetowa wydawcy
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