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Structure and magnetism of new hybrid cobalt hydroxide materials built from decorated brucite layers

Dalton Transactions, ISSN: 1477-9226, Vol: 40, Issue: 12, Page: 2983-2994
2011
  • 16
    Citations
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  • 22
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Metrics Details

  • Citations
    16
    • Citation Indexes
      16
  • Captures
    22

Article Description

The structure, synthesis and magnetic properties of three new complex cobalt hydroxyl oxalates are presented, showing a modification of the 2-D double layer hydroxide structure. Co(OH)(ox) (pip) [ox = oxalate, CO; pip = piperazine, CNH] (1), is essentially built from brucite-like layers with a one ninth depletion of the octahedral sites and a preservation of a trigonal crystallographic symmetry. ACo(OH) (ox)Br(HO) [A = Na (2), K (3)] are similarly composed of a brucite-like layer with three nineteenths depletion of octahedral sites, again preserving a trigonal symmetry. Both 2 and 3 show a small degree of structural disorder within the framework. All of these compounds have alternating layers of a mineral-like metal hydroxide structure and a metal oxalate coordination network, with the depletion in the hydroxyl layers being templated by the coordination network. Magnetic studies of 1 reveal a metamagnetic character, with the onset of an antiferromagnetic phase below T = 23.5 K (H = 0 G), and a first order antiferromagnet to metamagnet transition at H = 500-1000 G (T = 20-6 K). Compound 3 shows a more conventional ferrimagnetic ordering below 33(±1) K with a small coercive field of 107(±5) G at 10 K. © The Royal Society of Chemistry 2011.

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