Issue 39, 2011
From the journal:

Dalton Transactions

CoII, MnII and CuII-directed coordination polymers with mixed tetrazolate–dicarboxylate heterobridges exhibiting spin-canted, spin-frustrated antiferromagnetism and a slight spin-flop transition†

En-Cui Yang,*a   Zhong-Yi Liu,a   Xiao-Yun Wu,a   Hong Chang,a   En-Chan Wanga  and  Xiao-Jun Zhao*a  

* Corresponding authors

a College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin, P. R. China
E-mail: xiaojun_zhao15@yahoo.com.cn
Fax: +86-22-23766556

Abstract

Three new paramagnetic ion-directed coordination frameworks, {[Co4(H2O)2(μ3-OH)2(atz)2(nip)2]·3H2O}n (1), {[Mn4(H2O)2(μ3-OH)2(atz)2(nip)2]·H2O·MeOH}n (2) and {[Cu2(H2O)(μ3-OH)(atz)(nip)]·2H2O}n (3), were, respectively, obtained by solvo-/hydrothermal reactions of 5-amino-1H-tetrazole (Hatz), 5-nitroisophathalic acid (H2nip) with an inorganic CoII, MnII or CuII salt. The former two complexes are two-dimensional (2D) covalent layers built from butterfly-shaped tetranuclear M4(μ3-OH)2 clusters and double atz− and nip2− linkers. Whereas complex 3 is a 3D framework with scarcely observed corner-sharing Cu3(μ3-OH) Δ-chains extended by nip2− linkages, in which the anionic atz− ligand acts as a reinforcement to consolidate the Δ-chain. Magnetically, due to the interplay of the anisotropy of spin carrier and magnetic exchange interactions from the adjacent spin carriers, the complexes exhibit spin-canted antiferromagnetism with a Néel temperature lower than 2.0 K for 1 and an antiferromagnetic ordering with a slight field-induced spin-flop transition for 2. In contrast, complex 3 with a local Kagomé sublattice displays spin-frustrated antiferromagnetic behavior with magnetic ordering at 16.0 K.

Graphical abstract: CoII, MnII and CuII-directed coordination polymers with mixed tetrazolate–dicarboxylate heterobridges exhibiting spin-canted, spin-frustrated antiferromagnetism and a slight spin-flop transition

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Article information

DOI
https://doi.org/10.1039/C1DT10958H
Article type
Paper
Submitted
21 May 2011
Accepted
29 Jul 2011
First published
02 Sep 2011

Dalton Trans., 2011,40, 10082-10089

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CoII, MnII and CuII-directed coordination polymers with mixed tetrazolate–dicarboxylate heterobridges exhibiting spin-canted, spin-frustrated antiferromagnetism and a slight spin-flop transition

E. Yang, Z. Liu, X. Wu, H. Chang, E. Wang and X. Zhao, Dalton Trans., 2011, 40, 10082 DOI: 10.1039/C1DT10958H

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