Tuning the Circular Dichroism and Circular Polarized Luminescence Intensities of Chiral 2D Hybrid Organic–Inorganic Perovskites through Halogenation of the Organic Ions

Through the incorporation of various halogen‐substituted chiral organic cations, the effects of chiral molecules on the chiroptical properties of hybrid organic–inorganic perovskites (HOIPs) are investigated. Among them, the HOIP having a Cl‐substituted chiral cation exhibits the highest circular di...

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Published inAngewandte Chemie International Edition Vol. 60; no. 39; pp. 21434 - 21440
Main Authors Lin, Jin‐Tai, Chen, Deng‐Gao, Yang, Lan‐Sheng, Lin, Tai‐Chun, Liu, Yi‐Hung, Chao, Yu‐Chiang, Chou, Pi‐Tai, Chiu, Ching‐Wen
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 20.09.2021
EditionInternational ed. in English
Subjects
Cations
chirality
Chlorine
Circular dichroism
circular polarized luminescence
Dichroism
Dipoles
Halogenation
Luminescence
Magnetic transitions
Perovskites
rotatory strength
Substitutes
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Summary:Through the incorporation of various halogen‐substituted chiral organic cations, the effects of chiral molecules on the chiroptical properties of hybrid organic–inorganic perovskites (HOIPs) are investigated. Among them, the HOIP having a Cl‐substituted chiral cation exhibits the highest circular dichroism (CD) and circular polarized luminescence (CPL) intensities, indicating the existence of the largest rotatory strength, whereas the F‐substituted HIOP shows the weakest intensities. The observed modulation can be correlated to the varied magnetic transition dipole of HOIPs, which is sensitive to the d‐spacing between inorganic layers and the halogen–halogen interaction between organic cations and the inorganic sheets. These counteracting effects meet the optimal CD and CPL intensity with chlorine substitution, rendering the rotatory strength of HOIPs arranged in the order of (ClMBA)2PbI4>(BrMBA)2PbI4>(IMBA)2PbI4>(MBA)2PbI4>(FMBA)2PbI4. Through the incorporation of Cl‐substituted chiral organic cations, the chiroptical properties of 2D chiral perovskites can be significantly enhanced. The observed circular dichroism and circular polarized luminescence intensities are found to be associated with the d‐spacing of hybrid organic–inorganic perovskites and the strength of the halogen–halogen interaction within the system.
Bibliography:These authors contributed equally to this work.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202107239