A single layered organic-inorganic hybrid compound [(FBMA)2PbBr4] with reversible phase transition and intense fluorescent property

• Published in: Journal of solid state chemistry 2019-02, Vol.270, p.226-230
• Main Authors: Hao, Yanhuan, Wen, Shuyao, Yao, Jiaojiao, Wei, Zhenhong, Zhang, Xiuxiu, Jiang, Zhentao, Mei, Yingxuan, Cai, Hu
• Format: Article
• Language: English
• Subjects: 2D single layered compound; Fluorescent property; Organic-inorganic hybrid; Reversible phase transition
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2018.11.012

Reactions of 3-fluoro-N-methylbenzylamine (FBMA) with PbBr2 in concentrated HBr aqueous solution afforded a two-dimensional (2D) single layered organic-inorganic hybrid material [(FBMA)2PbBr4], which was confirmed by X-ray single crystal diffraction, infrared (IR) spectroscopy and powder X-ray diffraction (PXRD). The thermodynamic DSC analysis revealed it has a pair of reversible phase transition peaks with large thermal hysteresis exhibiting a first-order type phase transition. The variable-temperature single crystal diffraction proved the phase transition is originated from the order and disorder of organic-inorganic hybrid structures at room and high temperatures. Simultaneously compound [(FBMA)2PbBr4] exhibited a strong emission peak at 443 nm when under an excitation wavelength of 380 nm. A new two-dimensional (2D) single layered organic-inorganic hybrid material (FC6H4CH2NH2CH3)2[PbBr4] showed a first-order type phase transition, which was originated from the order-disorder transition of organic-inorganic hybrid structures at room and high temperatures. [Display omitted] •A new layered organic-inorganic-hybrid perovskite is designed, synthesized, and characterized.•The relationship between phase transitions and structural changes is addressed.•The optical property of (FC6H4CH2NH2CH3)2[PbBr4] is studied.