Phase transition and ring-puckering motion in a metal-organic perovskite [(CH2)3NH2][Zn(HCOO)3]

Tetsuo Asaji, Yoshiharu Ito, Janez Seliger, Veselko Žagar, Anton Gradišek, Tomaž Apih

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Phase transitions in a metal-organic perovskite with an azetidinium cation, which exhibits giant polarizability, were investigated using differential scanning calorimetry (DSC) and 1H nuclear magnetic resonance (NMR) measurements. The DSC results indicated successive phase transitions at 254 and 299 K. The temperature dependence of the spin-lattice relaxation time T 1 determined by NMR indicated that the activation energy for cation ring-puckering motion was 25 kJ mol-1 in phase I (T > 299 K). The potential energy at the transition state of puckering is expected to decrease when the potential for the motion becomes asymmetric with decreasing temperature in phases II and III. A possible mechanism for the onset of an extraordinarily large dielectric anomaly is discussed.

Original languageEnglish
Pages (from-to)12422-12428
Number of pages7
JournalJournal of Physical Chemistry A
Volume116
Issue number51
DOIs
Publication statusPublished - 27 Dec 2012

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