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Chiral metal–organic frameworks (chirMOFs) have been widely considered on enantioselective adsorption/separation, asymmetric catalysis, biological and nonlinear optical applications. However, chirMOFs are facing a great challenge in development of chiroptical thin films with circularly polarized luminescence (CPL) property. Here, we first report CPL thin films by encapsulating achiral lanthanide complexes Ln(acac)3 (Ln = EuaTbbGdc) into the pores of surface-coordinated chirMOF thin films (SURchirMOF) [Zn2(cam)2dabco]n with layer by layer (lbl) encapsulation strategy. Due to the unique combination of chiral porous MOF and adjustable luminescent complexes in the host–guest thin films, the obtained Ln(acac)3@SURchirMOF possess strong and tunable CPL property with high dissymmetry factors. The compared CPL and fluorescent lifetime results show that the advantage of this preparation strategy can effectively achieve energy transfer from Ln(acac)3 to SURchirMOF, resulting in an excellent CPL performance. This study not only provides a novel strategy to develop new types of chiral thin films but also offers an efficient approach for tunable chiroptical applications.


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Tunable chiroptical application by encapsulating achiral lanthanide complexes into chiral MOF thin films

Show Author's information Rui Zhai1,2Yihong Xiao1,4Zhigang Gu1,3,4( )Jian Zhang1,3,4
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002 China
College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007 China
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of ChinaFuzhou 350108 China
University of Chinese Academy of SciencesBeijing 100049 China

Abstract

Chiral metal–organic frameworks (chirMOFs) have been widely considered on enantioselective adsorption/separation, asymmetric catalysis, biological and nonlinear optical applications. However, chirMOFs are facing a great challenge in development of chiroptical thin films with circularly polarized luminescence (CPL) property. Here, we first report CPL thin films by encapsulating achiral lanthanide complexes Ln(acac)3 (Ln = EuaTbbGdc) into the pores of surface-coordinated chirMOF thin films (SURchirMOF) [Zn2(cam)2dabco]n with layer by layer (lbl) encapsulation strategy. Due to the unique combination of chiral porous MOF and adjustable luminescent complexes in the host–guest thin films, the obtained Ln(acac)3@SURchirMOF possess strong and tunable CPL property with high dissymmetry factors. The compared CPL and fluorescent lifetime results show that the advantage of this preparation strategy can effectively achieve energy transfer from Ln(acac)3 to SURchirMOF, resulting in an excellent CPL performance. This study not only provides a novel strategy to develop new types of chiral thin films but also offers an efficient approach for tunable chiroptical applications.

Keywords: encapsulation, thin films, metal–organic frameworks, lanthanide complexes, chiral optical application

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Publication history
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Acknowledgements

Publication history

Received: 06 March 2021
Revised: 18 May 2021
Accepted: 20 May 2021
Published: 16 July 2021
Issue date: February 2022

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB20000000), the National Key Research and Development Program of China (No. 2018YFA0208600), the National Natural Science Foundation of China (No. 21872148) and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (No. 2018339).

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