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Emergent Chirality and Nonlinear Optical Switching in a Ferroelastic Molecular Perovskite Solid Solution
Chemistry of Materials ( IF 7.2 ) Pub Date : 2021-01-12 , DOI: 10.1021/acs.chemmater.0c04735
Lei He 1 , Ping-Ping Shi 1 , Meng-Meng Zhao 1 , Cai-Ming Liu 2 , Wen Zhang 1 , Qiong Ye 1
Affiliation  

Solid solution has long been used in inorganic oxides to modulate structures and physical properties. In contrast, for molecular solid solutions, new and unexpected properties can emerge because of the distinct molecular conformations and spatial orientations. Herein, for the first time, we obtained a three-dimensional molecular perovskite ferroelastic [(EPCF)x(EPCCl)1–x][Mn(dca)3] solid solution (EPCF = [Et3P(CH2)2F]+, EPCCl = [Et3P(CH2)2Cl]+, and dca = dicyanamide, 0 ≤ x ≤ 1). At x = 0.170–0.405, the mixing of the centrosymmetric [EPCCl][Mn(dca)3] (P21/c) and [EPCF][Mn(dca)3] (C2/c) phases generates a new chiral P212121 phase with a second harmonic generation (SHG) response. Such a finding is unprecedented but desirable for tuning the crystal structure from centrosymmetry to noncentrosymmetry. The combination of the prominent SHG effect, increased spontaneous strain, and long-range magnetic ordering at a higher temperature opens a new avenue for constructing multifunctional molecular materials.

中文翻译:

铁弹性分子钙钛矿固溶体中的手性和非线性光学转换

固溶体早已用于无机氧化物中以调节结构和物理性质。相反,对于分子固溶体,由于不同的分子构象和空间取向,可能会出现新的和出乎意料的性质。在这里,我们首次获得了三维分子钙钛矿铁弹性[(EPCF)x(EPCCl)1- x ] [Mn(dca)3 ]固溶体(EPCF = [Et 3 P(CH 22 F ] +,EPCCl = [的Et 3 P(CH 22 CL] +,和DCA =二氰胺,0≤ X ≤1)。在x= 0.170–0.405,中心对称[EPCCl] [Mn(dca)3 ](P 2 1 / c)和[EPCF] [Mn(dca)3 ](C 2 / c)相的混合会生成新的手性P 2 1 2 1 2 1 1相具有二次谐波产生(SHG)响应。这样的发现是空前的,但是对于将晶体结构从中心对称调整为非中心对称是合乎需要的。突出的SHG效应,增加的自发应变和在较高温度下的长距离磁有序相结合,为构建多功能分子材料开辟了一条新途径。
更新日期:2021-01-26
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