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Flexible crystals of perovskite-like coordination polymers with a tunable and switchable organic guest: (CH3NH3)2[KFe(CN)6] and (CH3NH3)2[KCo(CN)6].
Autorzy
Rok wydania
2017
Czasopismo
Numer woluminu
46
Strony
2322-2331
DOI
10.1039/c6dt03915d
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Streszczenie
The crystal structure has been determined for (CH3NH3)2[KCo(CN)6] at temperatures 100 and 443 K. It crystallizes in the monoclinic space group C2/c (LT) and in the cubic one Fm¯3m (HT). The dielectric response has been investigated for the single crystals of pure K3[A’(CN)6]) and guest-hosts of (CH3NH3)2[KA’(CN)6], where A’ is trivalent metal, Co or Fe. Their dielectric properties were measured in the frequency range between 135 Hz and 2MHz in a wide temperature range between 200 and 460K. The anisotropy of the electric permittivity for the single crystals of (CH3NH3)2[KCo(CN)6] was analysed in terms of the crystal structure. The relaxation processes were observed in the case of pure host K3Fe(CN)6 and guest/host crystal (CH3NH3)2[KFe(CN)6]. The activation energies of the dielectric relaxation have been estimated to be equal to 44 and 40 kJ/mol for (CH3NH3)2[KFe(CN)6] and K3Fe(CN)6, respectively. The mechanism of the phase transitions found at 425 K and 421 K for (CH3NH3)2[KFe(CN)6] and (CH3NH3)2[KCo(CN)6], respectively, has been postulated. From the dielectric losses the value of the electric ac conductivity has been estimated and analyzed in terms of the activation process of the current carriers.
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Pełny tekst licencji: https://creativecommons.org/licenses/by/3.0/pl/legalcode
Adres publiczny
http://dx.doi.org/10.1039/c6dt03915d
Strona internetowa wydawcy
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