jz0c02235_si_005.cif (15.11 kB)
A Three-Dimensional Molecular Perovskite Ferroelastic with Two-Step Switching of Quadratic Nonlinear Optical Properties Tuned by Molecular Chiral Design
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posted on 2020-09-09, 22:18 authored by Zhi-Bo Liu, Lei He, Ping-Ping Shi, Qiong Ye, Da-Wei FuMolecular
perovskite materials have recently attracted extraordinary
interest from the academic community owing to their excellent multifunctional
properties. Nevertheless, although massive efforts have been made,
molecular ferroelastics with three-dimensional (3D) perovskite structures
are still rare. Herein, we report two 3D organic–inorganic
hybrid perovskites [(2-hydroxy-propyl)-tripropyl-ammonium][Mn(dca)3] (1) and [(2-hydroxy-1-methyl–ethyl)-tripropyl-ammonium]
[Mn(dca)3] (2) [dca = dicyanamide, N(CN)2]. The different position of the chiral center results in
a tremendous difference in the properties. Compound 1 displays only one phase transition; however, intriguingly, 2 has three phase transitions and represents ferroelastic
behavior with exceptional two-step switching of quadratic nonlinear
optical (NLO) properties. To the best of our knowledge, this is the
first molecular ferroelastic with two-step switching of quadratic
NLO properties. The results demonstrate that the molecular chiral
design works, and this finding opens up a new avenue to designing
multifunctional molecular perovskite materials.
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perovskite structuresCompound 1 displayschiral center resultsmultifunctional propertiesMolecular Chiral Design Molecular p...phase transitionchiral design worksperovskite materialsphase transitionsQuadratic Nonlinear Optical Propert...Three-Dimensional Molecular Perovsk...ferroelastic behavior3 DTwo-Step SwitchingNLO properties