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Nano Research 2021, 14(2): 398-403 https://doi.org/10.1007/s12274-020-2777-x
Research Article | Issue | Published: 15 April 2020

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

Show Author's Information Zhuo Wang1,2,  Li-Peng Zhou1,2,  Li-Xuan Cai1,2,  Chong-Bin Tian1,2,( ),  Qing-Fu Sun1,2,( )
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
University of Chinese Academy of Sciences, Beijing 100049, China
Keywords:
iron, spin-crossover compound, molecular square, coordination-directed self-assembly, supramolecular chemistry
Topics:
Mass spectrometryNuclear magnetic resonanceSingle crystals
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Wang Z, Zhou L-P, Cai L-X, et al. From a mononuclear FeL2 complex to a Fe4L4 molecular square: Designed assembly and spin-crossover property. Nano Research, 2021, 14(2): 398-403. https://doi.org/10.1007/s12274-020-2777-x
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Abstract Full text Electronic supplementary material About this article

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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Electronic supplementary material
About this article

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

Show Author's information Zhuo Wang1,2, Li-Peng Zhou1,2, Li-Xuan Cai1,2, Chong-Bin Tian1,2,( ), Qing-Fu Sun1,2,( )
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
University of Chinese Academy of Sciences, Beijing 100049, China

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.

Keywords: iron, spin-crossover compound, molecular square, coordination-directed self-assembly, supramolecular chemistry

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Publication history
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Acknowledgements

Publication history

Received: 31 January 2020
Revised: 18 March 2020
Accepted: 24 March 2020
Published: 15 April 2020
Issue date: February 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

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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