Enhanced Magnetic Hardness in a Nanoscale Metal–Organic Hybrid Ferrimagnet

Authors

  • Dr. Li-Rong Guo,

    1. Chemistry and Chemical Engineering, Nanjing National Lab of Microstructure, Nanjing University, Nanjing 210093 (P.R. China), Fax: (+86) 25-83314502
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  • Dr. Song-Song Bao,

    1. Chemistry and Chemical Engineering, Nanjing National Lab of Microstructure, Nanjing University, Nanjing 210093 (P.R. China), Fax: (+86) 25-83314502
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  • Prof. Dr. Bin Liu,

    1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069 (P.R. China)
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  • Dai Zeng,

    1. Chemistry and Chemical Engineering, Nanjing National Lab of Microstructure, Nanjing University, Nanjing 210093 (P.R. China), Fax: (+86) 25-83314502
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  • Jie Zhao,

    1. Chemistry and Chemical Engineering, Nanjing National Lab of Microstructure, Nanjing University, Nanjing 210093 (P.R. China), Fax: (+86) 25-83314502
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  • Prof. Dr. Jun Du,

    1. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (P.R. China)
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  • Prof. Dr. Li-Min Zheng

    Corresponding author
    1. Chemistry and Chemical Engineering, Nanjing National Lab of Microstructure, Nanjing University, Nanjing 210093 (P.R. China), Fax: (+86) 25-83314502
    • Chemistry and Chemical Engineering, Nanjing National Lab of Microstructure, Nanjing University, Nanjing 210093 (P.R. China), Fax: (+86) 25-83314502
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Abstract

A new layered metal–organic hybrid compound, namely, [Co33-OH)2(BTP)2] (1; BTP=4-(3-bromothienyl)phosphonate), is reported. The inorganic layer can be viewed as a pseudo-Kagomé lattice composed of corner-sharing irregular triangles of Co33-OH), with the cavities filled with the PO3 groups. The interlayer space is occupied by the 3-bromothienyl groups of BTP2−. The bulk sample of compound 1 experiences a long-range ferromagnetic ordering below 30.5 K, with a coercivity (Hc) of 5.04 kOe at 5 K. A systematic study on the size-dependent magnetic coercivity of 1 reveals that the coercivity of 1 increases with reduced particle size from the micrometer to the nanometer scale. When the particle size is about 50–200 nm, the coercivity reaches 24.2 kOe at 5 K. The results demonstrate that compound 1 can vary from a soft magnet to one of the hardest molecule-based magnets, simply by reducing the particle size to nanoscale region.

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