Issue 47, 2011
From the journal:

Dalton Transactions

Isomorphous Co(ii) and Ni(ii) antiferromagnets based on mixed azide- and carboxylate-bridged chains: metamagnetism and single-chain dynamics†

Xiu-Mei Zhang,ab   Kun Wang,a   Yan-Qin Wanga  and  En-Qing Gao*a  

* Corresponding authors

a Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai, China
E-mail: eqgao@chem.ecnu.edu.cn

b School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui, China

Abstract

Two isomorphous Co(II) and Ni(II) coordination polymers with azide and the 4-(4-pyridyl)benzoic acid N-oxide ligand (4,4-Hopybz) were synthesized, and structurally and magnetically characterized. They are formulated as [M(4,4-opybz)(N3)(H2O)]n (M = Co, 1 and Ni, 2). The compounds consist of 2D coordination networks, in which 1D coordination chains with (μ-N3)(μ-COO) bridges are interlinked by the 4,4-opybz spacers, and the structure also features intra- and interchain O–H⋯O hydrogen-bonding bridges between metal ions. Both compounds exhibit ferromagnetic interactions through the intrachain (μ-N3)(μ-COO)(O–H⋯O) bridges and antiferromagnetic interactions through the interchain O–H⋯O bridges. The ferromagnetic chains are antiferromagnetically ordered, and the antiferromagnetic phases exhibit field-induced metamagnetic transition. It is found that 1 displays slow relaxation of magnetization, typical of single-chain magnets, while 2 does not. The difference emphasizes the great importance of large magnetic anisotropy for single-chain-magnet dynamics.

Graphical abstract: Isomorphous Co(ii) and Ni(ii) antiferromagnets based on mixed azide- and carboxylate-bridged chains: metamagnetism and single-chain dynamics

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Article information

DOI
https://doi.org/10.1039/C1DT11068C
Article type
Paper
Submitted
07 Jun 2011
Accepted
02 Sep 2011
First published
19 Oct 2011

Dalton Trans., 2011,40, 12742-12749

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Isomorphous Co(II) and Ni(II) antiferromagnets based on mixed azide- and carboxylate-bridged chains: metamagnetism and single-chain dynamics

X. Zhang, K. Wang, Y. Wang and E. Gao, Dalton Trans., 2011, 40, 12742 DOI: 10.1039/C1DT11068C

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