Manipulating guest-responsive spin transition to achieve switchable fluorescence in a Hofmann-type framework

Xue Ru Wu; Shu Qi Wu; Zhi Kun Liu; Ming Xing Chen; Jun Tao; Osamu Sato; Hui Zhong Kou

doi:10.1007/s11426-024-2222-3

Manipulating guest-responsive spin transition to achieve switchable fluorescence in a Hofmann-type framework

Xue Ru Wu, Shu Qi Wu^*, Zhi Kun Liu, Ming Xing Chen, Jun Tao^*, Osamu Sato^*, Hui Zhong Kou^*

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The change of fluorescence emission manipulated by spin state transition attracts considerable attention owing to its potential applications in magneto-optical switching devices. Herein, we report two two-dimensional (2D) Hofmann-type spin crossover (SCO) metal-organic frameworks (MOFs) [Fe^II(PNI)₂{Ag^I(CN)₂}₂]·CHCl₃ (3Ag·CHCl₃) and [Fe^II(PNI)₂{Au^I(CN)₂}₂]·CHCl₃ (3Au·CHCl₃) based on the fluorescent ligand N-(4-pyridylmethyl)-1,8-naphthalimide (PNI). Both complexes exhibit interesting SCO behaviors switched by guest solvent molecules, namely three-step transitions for the solvated complexes and complete one-step hysteretic SCO for the desolvated ones, verified by temperature-dependent magnetic susceptibility measurements, Mossbauer spectra, structural analyses, and differential scanning calorimetry measurements. Correspondingly, temperature-dependent fluorescence spectra exhibit double peaks (monomer and excimer emission) with both emission peaks change consistent with the change in SCO properties during the solvent molecule removal. In this study, we integrated guest-responsive SCO behavior into MOFs to manipulate the multistability of spin state and fluorescence switching, providing a rational strategy for the development of stimuli-responsive multifunctional materials.

Original language	English
Pages (from-to)	3339-3346
Number of pages	8
Journal	Science China Chemistry
Volume	67
Issue number	10
DOIs	https://doi.org/10.1007/s11426-024-2222-3
Publication status	Published - Oct 2024

Keywords

fluorescence
Hofmann-type
metal-organic frameworks
multifunctional materials
spin crossover

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10.1007/s11426-024-2222-3

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title = "Manipulating guest-responsive spin transition to achieve switchable fluorescence in a Hofmann-type framework",

abstract = "The change of fluorescence emission manipulated by spin state transition attracts considerable attention owing to its potential applications in magneto-optical switching devices. Herein, we report two two-dimensional (2D) Hofmann-type spin crossover (SCO) metal-organic frameworks (MOFs) [FeII(PNI)2{AgI(CN)2}2]·CHCl3 (3Ag·CHCl3) and [FeII(PNI)2{AuI(CN)2}2]·CHCl3 (3Au·CHCl3) based on the fluorescent ligand N-(4-pyridylmethyl)-1,8-naphthalimide (PNI). Both complexes exhibit interesting SCO behaviors switched by guest solvent molecules, namely three-step transitions for the solvated complexes and complete one-step hysteretic SCO for the desolvated ones, verified by temperature-dependent magnetic susceptibility measurements, Mossbauer spectra, structural analyses, and differential scanning calorimetry measurements. Correspondingly, temperature-dependent fluorescence spectra exhibit double peaks (monomer and excimer emission) with both emission peaks change consistent with the change in SCO properties during the solvent molecule removal. In this study, we integrated guest-responsive SCO behavior into MOFs to manipulate the multistability of spin state and fluorescence switching, providing a rational strategy for the development of stimuli-responsive multifunctional materials.",

keywords = "fluorescence, Hofmann-type, metal-organic frameworks, multifunctional materials, spin crossover",

author = "Wu, {Xue Ru} and Wu, {Shu Qi} and Liu, {Zhi Kun} and Chen, {Ming Xing} and Jun Tao and Osamu Sato and Kou, {Hui Zhong}",

note = "Publisher Copyright: {\textcopyright} Science China Press 2024.",

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doi = "10.1007/s11426-024-2222-3",

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T1 - Manipulating guest-responsive spin transition to achieve switchable fluorescence in a Hofmann-type framework

AU - Wu, Xue Ru

AU - Wu, Shu Qi

AU - Liu, Zhi Kun

AU - Chen, Ming Xing

AU - Tao, Jun

AU - Sato, Osamu

AU - Kou, Hui Zhong

N1 - Publisher Copyright: © Science China Press 2024.

PY - 2024/10

Y1 - 2024/10

N2 - The change of fluorescence emission manipulated by spin state transition attracts considerable attention owing to its potential applications in magneto-optical switching devices. Herein, we report two two-dimensional (2D) Hofmann-type spin crossover (SCO) metal-organic frameworks (MOFs) [FeII(PNI)2{AgI(CN)2}2]·CHCl3 (3Ag·CHCl3) and [FeII(PNI)2{AuI(CN)2}2]·CHCl3 (3Au·CHCl3) based on the fluorescent ligand N-(4-pyridylmethyl)-1,8-naphthalimide (PNI). Both complexes exhibit interesting SCO behaviors switched by guest solvent molecules, namely three-step transitions for the solvated complexes and complete one-step hysteretic SCO for the desolvated ones, verified by temperature-dependent magnetic susceptibility measurements, Mossbauer spectra, structural analyses, and differential scanning calorimetry measurements. Correspondingly, temperature-dependent fluorescence spectra exhibit double peaks (monomer and excimer emission) with both emission peaks change consistent with the change in SCO properties during the solvent molecule removal. In this study, we integrated guest-responsive SCO behavior into MOFs to manipulate the multistability of spin state and fluorescence switching, providing a rational strategy for the development of stimuli-responsive multifunctional materials.

AB - The change of fluorescence emission manipulated by spin state transition attracts considerable attention owing to its potential applications in magneto-optical switching devices. Herein, we report two two-dimensional (2D) Hofmann-type spin crossover (SCO) metal-organic frameworks (MOFs) [FeII(PNI)2{AgI(CN)2}2]·CHCl3 (3Ag·CHCl3) and [FeII(PNI)2{AuI(CN)2}2]·CHCl3 (3Au·CHCl3) based on the fluorescent ligand N-(4-pyridylmethyl)-1,8-naphthalimide (PNI). Both complexes exhibit interesting SCO behaviors switched by guest solvent molecules, namely three-step transitions for the solvated complexes and complete one-step hysteretic SCO for the desolvated ones, verified by temperature-dependent magnetic susceptibility measurements, Mossbauer spectra, structural analyses, and differential scanning calorimetry measurements. Correspondingly, temperature-dependent fluorescence spectra exhibit double peaks (monomer and excimer emission) with both emission peaks change consistent with the change in SCO properties during the solvent molecule removal. In this study, we integrated guest-responsive SCO behavior into MOFs to manipulate the multistability of spin state and fluorescence switching, providing a rational strategy for the development of stimuli-responsive multifunctional materials.

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JF - Science China Chemistry

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ER -

Manipulating guest-responsive spin transition to achieve switchable fluorescence in a Hofmann-type framework

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