Structure and magnetism of new hybrid cobalt hydroxide materials built from decorated brucite layers
Structure and magnetism of new hybrid cobalt hydroxide materials built from decorated brucite layers
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. Co12(OH)18(ox)3(pip) [ox = oxalate, C2O42?; pip = piperazine, C4N2H10] (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. ACo28(OH)43(ox)6Br2(H2O)2 [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 Tc = 23.5 K (H = 0 G), and a first order antiferromagnet to metamagnet transition at Hc = 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.
2983
Keene, Tony D.
fb859c26-6a1d-4c43-a15f-f329bc8d34d7
Light, Mark E.
cf57314e-6856-491b-a8d2-2dffc452e161
Hursthouse, Michael B.
57a2ddf9-b1b3-4f38-bfe9-ef2f526388da
Price, Daniel J.
479ee5e3-2626-4abe-bffa-679d77ba5192
2011
Keene, Tony D.
fb859c26-6a1d-4c43-a15f-f329bc8d34d7
Light, Mark E.
cf57314e-6856-491b-a8d2-2dffc452e161
Hursthouse, Michael B.
57a2ddf9-b1b3-4f38-bfe9-ef2f526388da
Price, Daniel J.
479ee5e3-2626-4abe-bffa-679d77ba5192
Keene, Tony D., Light, Mark E., Hursthouse, Michael B. and Price, Daniel J.
(2011)
Structure and magnetism of new hybrid cobalt hydroxide materials built from decorated brucite layers.
Dalton Transactions, 40 (12), .
(doi:10.1039/C0DT01007C).
(PMID:21327226)
Abstract
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. Co12(OH)18(ox)3(pip) [ox = oxalate, C2O42?; pip = piperazine, C4N2H10] (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. ACo28(OH)43(ox)6Br2(H2O)2 [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 Tc = 23.5 K (H = 0 G), and a first order antiferromagnet to metamagnet transition at Hc = 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.
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Published date: 2011
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Local EPrints ID: 180989
URI: http://eprints.soton.ac.uk/id/eprint/180989
ISSN: 0300-9246
PURE UUID: 252abfd0-59d0-4171-91f1-4f296b564e68
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Date deposited: 13 Apr 2011 13:43
Last modified: 15 Mar 2024 03:01
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Author:
Tony D. Keene
Author:
Daniel J. Price
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