Phase Transition and Ring-Puckering Motion in a Metal-Organic Perovskite [(CH2)3NH2][Zn(HCOO)3]

被引：22

作者：

Asaji, Tetsuo ^{[1
,2
]}

Ito, Yoshiharu ^{[2
]}

Seliger, Janez ^{[3
,4
]}

Zagar, Veselko ^{[3
]}

Gradisek, Anton ^{[3
]}

Apih, Tomaz ^{[3
]}

机构：

[1] Nihon Univ, Coll Humanities & Sci, Dept Chem, Setagaya Ku, Tokyo 1568550, Japan

[2] Nihon Univ, Grad Sch Integrated Basic Sci, Dept Chem, Setagaya Ku, Tokyo 1568550, Japan

[3] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia

[4] Univ Ljubljana, Fac Math & Phys, SI-1000 Ljubljana, Slovenia

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2012年 / 116卷 / 51期

关键词：

NUCLEAR MAGNETIC-RESONANCE; INFRARED-SPECTRA; SOLID-STATE; RELAXATION; CYCLOBUTANE; FRAMEWORKS; DYNAMICS; RAMAN;

D O I：

10.1021/jp310132a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Phase transitions in a metal-organic perovskite with an azetidinium cation, which exhibits giant polarizability, were investigated using differential scanning calorimetry (DSC) and H-1 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.

引用

页码：12422 / 12428

页数：7

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