Switchable slow relaxation of magnetization in photochromic dysprosium(<scp>iii</scp>) complexes manipulated by a dithienylethene ligand

Kong, Ming; Feng, Xin; Li, Jing; Wang, Jia; Zhang, Yi‐Quan; Song, You

doi:10.1039/d0nj04457a

Cited by 11 publications

(6 citation statements)

References 70 publications

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“…Dithienylethenes (a subgroup of diarylethenes) seem to be the most widely used photochromic ligands for the construction of photomagnetic assemblies . Some of the current trends in the field of molecular photomagnets focus on the incorporation of the photoswitching functionality into lanthanide single-molecule magnets (Ln-SMMs)compounds that show magnetization blocking below a certain blocking temperature T B . − The use of photochromic ligands in the construction of Ln-SMMs ,, allows the control of various magnetization relaxation mechanismsusually the quantum tunneling of magnetization . However, the main targets are the temperature-dependent relaxation mechanisms: Raman and Orbach.…”

Section: Introductionmentioning

confidence: 99%

Low-Coordinate Erbium(III) Single-Molecule Magnets with Photochromic Behavior

et al. 2022

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The structures and magnetic properties of photoresponsive magnets can be controlled or fine-tuned by visible light irradiation, which makes them appealing as candidates for ternary memory devices: photochromic and photomagnetic at the same time. One of the strategies for photoresponsive magnetic systems is the use of photochromic/photoswitchable molecules coordinated to paramagnetic metal centers to indirectly influence their magnetic properties. Herein, we present two erbium(III)-based coordination systems: a trinuclear molecule {[ErIII(BHT)3]3(dtepy)2}.4C5H12 (1) and a 1D coordination chain {[ErIII(BHT)3(azopy)} n ·2C5H12 (2), where the bridging photochromic ligands belong to the class of diarylethenes: 1,2-bis((2-methyl-5-pyridyl)thie-3-yl)perfluorocyclopentene (dtepy) and 4,4′-azopyridine (azopy), respectively (BHT = 2,6-di-tert-butyl-4-methylphenolate). Both compounds show slow dynamics of magnetization, typical for single-molecule magnets (SMMs) as revealed by alternating current (AC) magnetic susceptibility measurements. The trinuclear compound 1 also shows an immediate color change from yellow to dark blue in response to near-UV irradiation. Such behavior is typical for the photoisomerization of the open form of the ligand into its closed form. The color change can be reversed by exposing the closed form to visible light. The chain-like compound 2, on the other hand, does not show significant signs of the expected trans–cis photoisomerization of the azopyridine in response to UV irradiation and does not appear to show photoswitching behavior.

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Section: Introductionmentioning

confidence: 99%

Low-Coordinate Erbium(III) Single-Molecule Magnets with Photochromic Behavior

et al. 2022

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“…20 Some of the current trends in the field of molecular photomagnets focus on the incorporation of the photoswitching functionality into lanthanide single molecule magnets (Ln-SMMs) -compounds that show magnetization blocking below a certain blocking temperature TB. 21,22,23 The use of photochromic ligands in the construction of Ln-SMMs 15,16,24 allows the control of various magnetization relaxation mechanisms -usually the quantum tunneling of magnetization. 16 However, the main targets are the temperature-dependent relaxation mechanisms: Raman and Orbach.…”

Section: Introductionmentioning

confidence: 99%

Low-Coordinate Erbium(III) Single-Molecule Magnets with Photochromic Behavior

Rogacz

Brzozowska

Baś

et al. 2022

Preprint

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The structure and magnetic properties of photo-responsive magnets can be controlled or fine-tuned by visible light irradiation which makes them appealing as candidates for ternary memory devices: photochromic and photomagnetic at the same time. One of the strategies for photo-responsive magnetic systems is the use of photochromic/photoswitchable molecules coordinated to paramagnetic metal centers to in-directly influence their magnetic properties. Herein, we present two erbium(III) based coordination systems: a trinuclear molecule {[ErIII(BHT)3]3(dtepy)2}.3C5H12 (1) and a 1-D coordination chain {[ErIII(BHT)3(azopy)}nnC5H12 (2), where the bridging photochromic ligands belong to the class of diarylethenes: 1,2-bis(2-methyl-5-pyridyl)thie-3-yl)perfluorocyclopentene (dtepy) and 4,4'-azopyridine (azopy), respectively (BHT = 2,6-di-tert-butyl-4-methylphenolate). Both compounds show slow dynamics of the magnetization, typical for single-molecule magnets (SMMs) as revealed by alternating current (AC) magnetic susceptibility measurements. The trinuclear compound 1, shows also an immediate color change from yellow to dark blue in response to near-UV irradiation. Such a behavior is typical for the photo-isomerization of the open-form of the ligand o-dtepy ligand into its closed-form c-dtepy. The color change can be reversed by exposing the c-dtepy to visible light. The chain-like compound 2, on the other hand, does not show significant signs of the expected trans-cis photoisomerization in response to UV irradiation and does not appear to show photoswitching behavior.

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“…Synthesis and applications of such materials are evolving quickly and remain an active area of study. − On account of structural and functional diversity, coordination polymer (CP) materials, as is well known, have been widely studied in this research domain. The flexible organic ligands are commonly used to create chromic CP materials that are responsive to various stimuli, which involve bipyridine derivatives, − diarylethene derivatives, − azobenzene derivatives, − spiropyrans, , and so forth. One of the popular building blocks for the creation of multistimulus-responsive chromic CPs is viologen and its derivates, − which belongs to the bipyridine derivatives.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Chain Viologen-Based Lanthanide Multistimulus-Responsive Materials with Photochromism, Photoluminescence, Photomagnetism, and Ammonia/Amine Vapor Sensing

Zhou

Chen

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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In this work, a series of novel multistimulus-responsive lanthanide coordination polymers {[LnL(H2O)4]Cl3·3H2O} n (Ln = Dy, Tb, Eu) constructed using a dicarboxylic acid viologen derivative L (L = N,N′-4,4′-bipyridiniodipropionate) and LnCl3·6H2O were prepared. All materials showed positive responses to UV light, and the photochromic phenomena accompanied by significant photoquenching of photoluminescence could be observed through a photoelectron transfer mechanism. Strikingly, the Dy analogue displayed photomagnetic behavior, as well as responded positively to small molecules of inorganic ammonia/organic amines. Furthermore, the good photoresponsive and ammonia/amine vapor-responsive properties of the Dy-based material were further fulfilled in dual-function papers involving erasable inkless printing and visual amine detection applications. This work aims to advance the development of multistimulus-responsive multifunctional materials incorporating viologen derivates and versatile lanthanide ions and further enriches the research in this field.

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Switchable slow relaxation of magnetization in photochromic dysprosium(iii) complexes manipulated by a dithienylethene ligand

Cited by 11 publications

References 70 publications

Low-Coordinate Erbium(III) Single-Molecule Magnets with Photochromic Behavior

Low-Coordinate Erbium(III) Single-Molecule Magnets with Photochromic Behavior

Low-Coordinate Erbium(III) Single-Molecule Magnets with Photochromic Behavior

One-Dimensional Chain Viologen-Based Lanthanide Multistimulus-Responsive Materials with Photochromism, Photoluminescence, Photomagnetism, and Ammonia/Amine Vapor Sensing

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