Title of Paper:Switching single chain magnet behavior via photoinduced bidirectional metal-to-metal charge transfer

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Date of Publication:2018-01-21

Journal:CHEMICAL SCIENCE

Included Journals:ESI高被引论文、PubMed、SCIE、EI

Volume:9

Issue:3

Page Number:617-622

ISSN No.:2041-6520

Abstract:The preparation of single-chain magnets (SCMs) with photo-switchable bistable states is essential for the development of high-density photo-recording devices. However, the reversible switching of the SCM behavior upon light irradiation is a formidable challenge. Here we report a well-isolated double zigzag chain {[Fe(bpy)(CN)(4)](2)[Co(phpy)(2)]}center dot 2H(2)O (bpy = 2,2'-bipyridine, phpy = 4-phenylpyridine), which exhibits reversible redox reactions with interconversion between Fe-LS(III)(mu-CN) Co-HS(II)(mu-NC) Fe-LS(III) (LS = low-spin, HS = high-spin) and Fe-LS(III) (mu-CN) Co-LS(III) (mu-NC) Fe-LS(II) linkages under alternating irradiation with 808 and 532 nm lasers. The bidirectional photo-induced metal-to-metal charge transfer results in significant changes of anisotropy and intrachain magnetic interactions, reversibly switching the SCM behavior. The on-switching SCM behavior driven by light irradiation at 808 nm could be reversibly switched off by irradiation at 532 nm. The results provide an additional and independent way to control the bistable states of SCMs by switching in the 0 -> 1 -> 0 sequence, with potential applications in high density storage and molecular switches.