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

Keene, T.D., Light, M.E., Hursthouse, M.B. and Price, D.J. (2011) Structure and magnetism of new hybrid cobalt hydroxide materials built from decorated brucite layers. Dalton Transactions, 40(12), pp. 2983-2994. (doi: 10.1039/C0DT01007C)

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 T_c = 23.5 K (H = 0 G), and a first order antiferromagnet to metamagnet transition at H_c = 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Price, Dr Daniel
• Authors: Keene, T.D., Light, M.E., Hursthouse, M.B., and Price, D.J.
• Subjects: Q Science > QD Chemistry
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Dalton Transactions
• Journal Abbr.: Dalton Trans.
• Publisher: Royal Society of Chemistry
• ISSN: 1477-9226
• ISSN (Online): 1477-9234
• Published Online: 15 February 2011
• Copyright Holders: Copyright © 2011 Royal Society of Chemistry
• First Published: First published in Dalton Transactions 40(12):2983-2994
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher