Cargando…

Regulating Reversible Phase Transition Behaviors by Poly-H/F Substitution in Hybrid Perovskite-Like 2[CH(2)FCH(2)NH(3)]·[CdCl(4)]

[Image: see text] The molecular design and regulation has shown bright future for constructing smart molecular materials such as ferroelectrics, dielectric switches, electro-optic effect, and so forth. Here, by poly-H/F substitution in a simple organic-inorganic hybrid 2[CH(2)FCH(2)NH(3)]·[CdCl(4)],...

Descripción completa

Detalles Bibliográficos
Autores principales: Song, Ning, Chen, Shao-Peng, Fan, Xiao-Wei, Tan, Yu-Hui, Wei, Wen-Juan, Tang, Yun-Zhi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7114730/
https://www.ncbi.nlm.nih.gov/pubmed/32258912
http://dx.doi.org/10.1021/acsomega.0c00113
Descripción
Sumario:[Image: see text] The molecular design and regulation has shown bright future for constructing smart molecular materials such as ferroelectrics, dielectric switches, electro-optic effect, and so forth. Here, by poly-H/F substitution in a simple organic-inorganic hybrid 2[CH(2)FCH(2)NH(3)]·[CdCl(4)], 1 (CH(2)FCH(2)NH(3) = fluorine ethylamine cation), we obtained two novel hybrids, namely, 2[CHF(2)CH(2)NH(3)]·[CdCl(4)], 2 (CHF(2)CH(2)NH(3) = 2,2′-difluorine ethylamine cation) and 2[CF(3)CH(2)NH(3)]·[CdCl(4)], 3 (CF(3)CH(2)NH(3) = 2,2′,2″-trifluorine ethylamine cation). Further investigations show that compounds 1, 2, and 3 experience solid reversible phase transitions with temperatures at 294, 319, and 329 K respectively. These unique phase transitions were confirmed by their remarkable dielectric and heat anomalies around the phase transition temperatures. X-ray single-crystal diffraction analyses before and after the phase transitions show that the order–disorder motions of F atoms and the twist motions from the 2D [CdCl(4)](2–) framework lead to these solid reversible phase transitions. Also, the Hirshfeld surface calculation of compounds 1, 2, and 3 suggests that the increasing ratio of the F···F interaction from the intermolecular interaction makes a major contribution for the substantial increase of their phase transition temperatures.