A Z/E isomeric cation designed organic-inorganic cadmium chloride ferroelectric with broadband white-light emission

IF 10.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Jun-Chao Qi, Yan Qin, Hang Peng, Hui-Peng Lv, Yong-Ju Bai, Xin Shen, Zhang-Tian Xia, Wei-Qiang Liao
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引用次数: 0

Abstract

Hybrid organic-inorganic metal halides (HOMHs) have attracted tremendous interest in the past decades due to their diverse functional properties, such as ferroelectricity and luminescence. However, although a large number of ferroelectric HOMHs and luminescent HOMHs have been reported, the HOMH ferroelectrics with white-light emission remain very sparse. Here, for the first time, by using the Z/E isomeric organic cation, we designed a cadmium-based HOMH ferroelectric [EE-PMU]CdCl4 (EE-PMU = pyridin-2-ylmethanamide muconate) with broadband white-light emission. In contrast to the [ZZ-PMU]CdCl4 with centrosymmetric crystal structure at room temperature, [EE-PMU]CdCl4 adopts the polar crystal symmetry, which shows piezoelectricity with a piezoelectric coefficient of d33 up to 19 pC/N and ferroelectricity with the saturated polarization of 1.52 µC/cm2. Moreover, [EE-PMU]CdCl4 exhibits a broadband white-light emission with an ultra-high color rendering index of 91 under UV excitation, which is related to the severely distorted [CdCl4]2− tetrahedron in the structure. To our knowledge, [EE-PMU]CdCl4 is the first example of Z/E isomeric cation-designed HOMH ferroelectric and the first cadmium halide white-light emissive ferroelectric. This finding paves a new way for the design of organic-inorganic molecular ferroelectrics with white-light emission.

具有宽带白光发射功能的 Z/E 异构阳离子设计有机无机氯化镉铁电体
过去几十年来,有机-无机混合金属卤化物(HOMHs)因其铁电性和发光等多种功能特性引起了人们的极大兴趣。然而,尽管已有大量铁电性 HOMHs 和发光 HOMHs 的报道,但具有白光发射的 HOMH 铁电性物质仍然非常稀少。在此,我们首次利用 Z/E 异构有机阳离子,设计出了具有宽带白光发射的镉基 HOMH 铁电体 [EE-PMU]CdCl4(EE-PMU = 吡啶-2-基甲酰胺粘多糖)。与室温下具有中心对称晶体结构的[ZZ-PMU]CdCl4 不同,[EE-PMU]CdCl4 采用极性晶体对称,具有压电性(压电系数 d33 高达 19 pC/N)和铁电性(饱和极化为 1.52 µC/cm2)。此外,[EE-PMU]CdCl4 在紫外线激发下可发出宽带白光,显色指数高达 91,这与结构中严重畸变的[CdCl4]2-四面体有关。据我们所知,[EE-PMU]CdCl4 是第一个 Z/E 异构阳离子设计的 HOMH 铁电体,也是第一个卤化镉白光发射铁电体。这一发现为设计具有白光发射功能的有机-无机分子铁电体铺平了新的道路。
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来源期刊
Science China Chemistry
Science China Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
14.40
自引率
7.30%
发文量
3787
审稿时长
2.2 months
期刊介绍: Science China Chemistry, co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China and published by Science China Press, publishes high-quality original research in both basic and applied chemistry. Indexed by Science Citation Index, it is a premier academic journal in the field. Categories of articles include: Highlights. Brief summaries and scholarly comments on recent research achievements in any field of chemistry. Perspectives. Concise reports on thelatest chemistry trends of interest to scientists worldwide, including discussions of research breakthroughs and interpretations of important science and funding policies. Reviews. In-depth summaries of representative results and achievements of the past 5–10 years in selected topics based on or closely related to the research expertise of the authors, providing a thorough assessment of the significance, current status, and future research directions of the field.
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