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Issue 39, 2011
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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

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Abstract

Three new paramagnetic ion-directed coordination frameworks, {[Co4(H2O)23-OH)2(atz)2(nip)2]·3H2O}n (1), {[Mn4(H2O)23-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 M43-OH)2 clusters and double atz and nip2− linkers. Whereas complex 3 is a 3D framework with scarcely observed corner-sharing Cu33-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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Publication details

The article was received on 21 May 2011, accepted on 29 Jul 2011 and first published on 02 Sep 2011


Article type: Paper
DOI: 10.1039/C1DT10958H
Citation: 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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