Control of the Single‐Molecule Magnet Behavior of Lanthanide‐Diarylethene Photochromic Assemblies by Irradiation with Light |
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| Authors: | Dr. Dawid Pinkowicz Min Ren Prof. Li‐Min Zheng Saki Sato Prof. Miki Hasegawa Dr. Masakazu Morimoto Prof. Masahiro Irie Prof. Brian K. Breedlove Dr. Goulven Cosquer Dr. Keiichi Katoh Prof. Masahiro Yamashita |
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| Affiliation: | 1. Department of Chemistry, Graduate School of Science, Tohoku University, 6–3 Aramaki‐Aza‐Aoba, Aoba‐ku, Sendai 980‐8578 (Japan);2. Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30‐060 Kraków (Poland);3. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (P.R. China);4. Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama‐Gakuin University, 5‐10‐1 Fuchinobe, Sagamihara, Kanagawa 229‐8558 (Japan);5. Department of Chemistry and Research Center for Smart Molecules, Rikkyo University, Nishi‐Ikebukuro 3‐34‐1, Toshima‐ku, Tokyo (Japan);6. Core Research for Evolutional Science and Technology (CREST) (Japan) Science and Technology (JST), 4‐1‐8 Kawaguchi, Saitama 332‐0012 (Japan) |
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| Abstract: | Lanthanide‐based extended coordination frameworks showing photocontrolled single‐molecule magnet (SMM) behavior were prepared by combining highly anisotropic DyIII and HoIII ions with the carboxylato‐functionalized photochromic molecule 1,2‐bis(5‐carboxyl‐2‐methyl‐3‐thienyl)perfluorocyclopentene (H2dae), which acts as a bridging ligand. As a result, two new compounds of the general formula [{LnIII2(dae)3(DMSO)3(MeOH)} ? 10 M eOH]n (M=Dy for 1 a and Ho for 2 ) and two additional pseudo‐polymorphs [{DyIII2(dae)3(DMSO)3(H2O)} ? x MeOH]n ( 1 b ) and [{DyIII2(dae)3(DMSO)3(DMSO)} ? x MeOH]n ( 1 c ) were obtained. All four compounds have 2D coordination‐layer topologies, in which carboxylate‐bridged Ln2 units are linked together by dae2? anions into grid‐like frameworks. All four compounds exhibited a strong reversible photochromic response to UV/Vis light. Moreover, both 1 a and 2 show field‐induced SMM behavior. The slow magnetic relaxation of 1 a is influenced by the photoisomerization reaction leading to the observation of the cross‐effect: photocontrolled SMM behavior. |
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| Keywords: | lanthanides layered compounds magnetic properties photochromism single‐molecule magnets |
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