Novel Co complex with high transformation temperature of valence tautomerism |
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| Institution: | 1. Special Research Laboratory for Optical Science, Kanagawa Academy of Science and Technology, KSP Building East 412, 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa 213-0012, Japan;2. Department of Chemistry, Tsinghua University, Beijing 100084, China;3. Department of Applied Chemistry, Tokyo University, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;1. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China;2. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;1. Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;2. Australian Synchrotron, 800 Blackburn Road, Clayton, VIC 3168, Australia;3. School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia |
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| Abstract: | The preparation and characterization of CoII-HS(dpa)(3,5-DBSQ)2] are presented first time. From the magnetic curve, the phase transition temperatures, Tc is 380 K. To our knowledge, the Tc value is the highest among the species exhibiting thermal valence tautomerism. After illumination with 532 nm light at 5 K, the magnetization values increase from μeff=1.73 to 2.0μB, showing valence tautomerism. The metastable state will recover to the original state with the increase of temperature. The alternate illumination with 532 and 830 nm light at 5 K can induce a reversible change in magnetization. The quick response to light means that this compound can be used for the development of optical–magnetic switch. |
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