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论文类型：期刊论文

发表时间：2018-01-21

发表刊物：CHEMICAL SCIENCE

收录刊物：ESI高被引论文、PubMed、SCIE、EI

卷号：9

期号：3

页面范围：617-622

ISSN号：2041-6520

摘要：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.