Ring-Puckering Motion of Azetidinium Cations in a Metal-Organic Perovskite [(CH 2 ) 3 NH 2 ][M(HCOO) 3 ] (M = Zn, Mg) - A Thermal and 1 H NMR Relaxation Study

Tetsuo Asaji, Yoshiharu Ito, Hiroki Fujimori, Biao Zhou

研究成果: ジャーナルへの寄稿記事査読

6 被引用数 (Scopus)

抄録

A metal-organic perovskite which consists of four-membered-ring ammonium (azetidinium), magnesium, and formate ions [(CH 2 ) 3 NH 2 ][Mg(HCOO) 3 ] was synthesized. Differential scanning calorimetry revealed a first-order phase transition at T c = 288 K. Besides a sharp anomaly at T c , a broad Schottky-type anomaly was observed at 273 K. Temperature dependences of spin-lattice and dipolar spin-lattice relaxation times T 1 and T 1D were determined. In the low-temperature phase, short and long T 1 -values were observed. T 1D showed a minimum of 0.15 ms at around 220 K, which can be assigned to the ring-puckering motion of the azetidinium cation. Compared with the previously reported zinc analogue [(CH 2 ) 3 NH 2 ][Zn(HCOO) 3 ], energy separation between the two molecular conformations associated with the ring-puckering motion and inhomogeneity that occurred in the crystals at low temperatures are discussed.

本文言語英語
ページ(範囲)4291-4298
ページ数8
ジャーナルJournal of Physical Chemistry C
123
7
DOI
出版ステータス出版済み - 21 2月 2019

フィンガープリント

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