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Topological ferrimagnetism and superparamagnetic-like behaviour in a disordered homometallic coordination network

Topological ferrimagnetism and superparamagnetic-like behaviour in a disordered homometallic coordination network
Topological ferrimagnetism and superparamagnetic-like behaviour in a disordered homometallic coordination network
Crystals of a cobalt(II) 3-amino-1,2,4-triazolate; Co2Cl(C2N4H3)3, 1 can be formed from a hydrothermal synthesis. X-Ray crystallography shows an extended 3-dimensional network structure within a hexagonal space group with a = 9.9655(7) and c = 7.7523(7) Å. The data reveal an orientational disorder to the ligand. Structural considerations suggest that the ligand orientation is strongly correlated in 1-dimension, but the nature and length scale of the 2-dimensional order is not obvious. The structure is discussed in terms of three key structural models, two of which are crystallographically ordered, while the third is disordered in 2-dimensions. The effect of ligand orientation on the network topology has profound effects on the expected magnetic behaviour, with the two fully ordered models having either antiferromagnetic or ferrimagnetically ordered ground states. The magnetism of 1 is complex. It shows an antiferromagnetically coupled paramagnetic phase above 5.3 K. Below 4.5 K we see a ferrimagnetically ordered state (Hcoer = 50 Oe, Mrem = 1830 Oe cm3 mol–1, Msat = 3450 Oe cm3 mol–1 at 2 K). In the intermediate temperature range 4.5 to 5.3 K we see unusual behaviour with evidence of rapid, low-energy relaxation of the magnetisation. The unusual relationship between the structure and the magnetism of 1 is discussed in detail.
crystal-structure, systems, molecular materials, magnetic-properties, compound, cobalt(ii), ligands, complexes, open-framework, low-temperatures
1477-9226
4034-4039
Patel, Rina
0f4f5122-ade3-4523-8c7c-a7792a884692
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Price, Daniel J.
479ee5e3-2626-4abe-bffa-679d77ba5192
Patel, Rina
0f4f5122-ade3-4523-8c7c-a7792a884692
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Price, Daniel J.
479ee5e3-2626-4abe-bffa-679d77ba5192

Patel, Rina, Weller, Mark T. and Price, Daniel J. (2007) Topological ferrimagnetism and superparamagnetic-like behaviour in a disordered homometallic coordination network. Dalton Transactions, (36), 4034-4039. (doi:10.1039/b706829h).

Record type: Article

Abstract

Crystals of a cobalt(II) 3-amino-1,2,4-triazolate; Co2Cl(C2N4H3)3, 1 can be formed from a hydrothermal synthesis. X-Ray crystallography shows an extended 3-dimensional network structure within a hexagonal space group with a = 9.9655(7) and c = 7.7523(7) Å. The data reveal an orientational disorder to the ligand. Structural considerations suggest that the ligand orientation is strongly correlated in 1-dimension, but the nature and length scale of the 2-dimensional order is not obvious. The structure is discussed in terms of three key structural models, two of which are crystallographically ordered, while the third is disordered in 2-dimensions. The effect of ligand orientation on the network topology has profound effects on the expected magnetic behaviour, with the two fully ordered models having either antiferromagnetic or ferrimagnetically ordered ground states. The magnetism of 1 is complex. It shows an antiferromagnetically coupled paramagnetic phase above 5.3 K. Below 4.5 K we see a ferrimagnetically ordered state (Hcoer = 50 Oe, Mrem = 1830 Oe cm3 mol–1, Msat = 3450 Oe cm3 mol–1 at 2 K). In the intermediate temperature range 4.5 to 5.3 K we see unusual behaviour with evidence of rapid, low-energy relaxation of the magnetisation. The unusual relationship between the structure and the magnetism of 1 is discussed in detail.

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More information

Published date: 2007
Keywords: crystal-structure, systems, molecular materials, magnetic-properties, compound, cobalt(ii), ligands, complexes, open-framework, low-temperatures

Identifiers

Local EPrints ID: 54358
URI: http://eprints.soton.ac.uk/id/eprint/54358
ISSN: 1477-9226
PURE UUID: ef559e14-4e53-4d96-b049-030a13af2d4c

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Date deposited: 31 Jul 2008
Last modified: 15 Mar 2024 10:47

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Contributors

Author: Rina Patel
Author: Mark T. Weller
Author: Daniel J. Price

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