Issue 12, 2011
From the journal:

Dalton Transactions

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

Tony D. Keene,ac   Mark E. Light,b   Michael B. Hursthouseb  and  Daniel J. Price*a  

* Corresponding authors

a WestCHEM, School of Chemistry, University of Glasgow, Glasgow, United Kingdom
E-mail: Daniel.Price@glasgow.ac.uk
Fax: +44-141-330-4888

b School of Chemistry, University of Southampton, Highfield, Southampton, United Kingdom

c Present address: School of Chemistry, Building F11, University of Sydney, Sydney, Australia

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.

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

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Article information

DOI
https://doi.org/10.1039/C0DT01007C
Article type
Paper
Submitted
12 Aug 2010
Accepted
05 Jan 2011
First published
15 Feb 2011

Dalton Trans., 2011,40, 2983-2994

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

T. D. Keene, M. E. Light, M. B. Hursthouse and D. J. Price, Dalton Trans., 2011, 40, 2983 DOI: 10.1039/C0DT01007C

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