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Acta Chimica Sinica >

2013 , Vol. 71 >Issue 04: 555 - 559

DOI: https://doi.org/10.6023/A12100839

Article

Layered Cobalt Phosphonate with Metamagnetism

  • Cai Zhongsheng ,
  • Bao Songsong ,
  • Zheng Limin
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  • State Key Laboratory of Coordination Chemistry, Nanjing University 210093

Received date: 2012-10-30

  Online published: 2013-01-25

Supported by

Project supported by the National Basic Research Program of China (No. 2010CB923402) and the Natural Science Foundation of Jiangsu Province of China (No. BK2009009).

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Abstract

Two layered cobalt phosphonates, namely, Co2(L)(H2O)2·0.3H2O (1) and Co2(L)(H2O) (2) (H4L＝C6H5CH2N- (CH2PO3H2)2) have been synthesized under hydrothermal condition. Single-crystal X-ray diffraction determinations reveal that compound 1 crystallizes in triclinic space group P-1, with a＝6.320(1) Å, b＝9.484(1) Å, c＝12.705(1) Å, α ＝ 91.7(1)°, β＝ 96.2(1)°, γ ＝103.9(1)°, V＝733.8(1) Å3, Z＝2 and compound 2 crystallizes in monoclinic space group P21/c, with a＝14.165(2) Å, b＝9.574(1) Å, c＝10.072(1) Å, β＝102.5(1)°, V＝1333.4(3) Å3, Z＝4. Both compounds display layered structures in which the inorganic layers made up of tetranuclear clusters of {Co4O6} and {PO3C} linkages are separated by the methylphenyl groups. However, the tetranuclear clusters are different in the two compounds. In 1, the {Co4O6} cluster is composed of edge-sharing {Co(1)NO5} and {Co(2)O6} octahedra in a zigzag arrangement. While in 2, the equivalent edge-sharing {Co(1)NO5} octahedra are each corner-shared with the {Co(1)O5} triangular bipyramids, forming a butterfly-like tetramer. Magnetic measurements are conducted for compound 1 which shows a dominant antiferromagnetic interactions between the Co(II) centers. Moreover, metamagnetism is observed for 1 at low temperature with a critical field of 26.0 kOe at 2 K. The dehydrated sample, 1-de, was also prepared by heating 1 at 180 ℃ for 20 min. Magnetic measurement reveals that 1-de exhibits field-induced spin-flop transition with HSF of 28.0 kOe at 1.8 K. CCDC: 908112 (1), 908113 (2).

Key words： layer; cobalt; phosphonate; metamagnetism

Cite this article

Cai Zhongsheng , Bao Songsong , Zheng Limin . Layered Cobalt Phosphonate with Metamagnetism[J]. Acta Chimica Sinica, 2013 , 71(04) : 555 -559 . DOI: 10.6023/A12100839

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[12] Structural data for compound 1: triclinic, space group P-1, a＝6.320(1) Å, b＝9.484(1) Å, c＝12.705(1) Å, α＝91.7(1)°, β ＝96.2(1)°, γ ＝103.9(1)°, V＝733.8(1) Å3, Z＝2.

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