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From a mononuclear FeL2 complex to a Fe4L4 molecular square: Designed assembly and spin-crossover property

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Abstract

By introduction of a new Fe(L1)2 spin-crossover (SCO) unit into the polynuclear system, a nano-scale Fe4(L2)4 molecular square architecture is designed through coordination-directed self-assembly strategy. Both the mononuclear Fe(L1)2 and tetranuclear Fe4(L2)4 complexes have been structurally confirmed by 1H nuclear magnetic resonance (NMR), electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS), and temperature-dependent single crystal X-ray diffraction studies. Variable-temperature magnetic susceptibility measurements reveal the presence of an abrupt SCO behavior with a thermal hysteresis width of 4 K for Fe(L1)2. By clear contrast, Fe4(L2)4 undergoes a gradual spin transition behavior with enlarged thermal hysteresis width and higher spin transition temperature.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21825107, 21971237, and 21801241) and the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB20000000).

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Authors and Affiliations

  1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China

    Zhuo Wang, Li-Peng Zhou, Li-Xuan Cai, Chong-Bin Tian & Qing-Fu Sun

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Zhuo Wang, Li-Peng Zhou, Li-Xuan Cai, Chong-Bin Tian & Qing-Fu Sun

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  1. Zhuo Wang
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Correspondence to Chong-Bin Tian or Qing-Fu Sun.

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Wang, Z., Zhou, LP., Cai, LX. et al. From a mononuclear FeL2 complex to a Fe4L4 molecular square: Designed assembly and spin-crossover property. Nano Res. 14, 398–403 (2021). https://doi.org/10.1007/s12274-020-2777-x

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