Metamagnetic behavior and moisture-absorption induced reversible network assembly of a cobalt-1,2,4-benzenetricarboxylate supramolecular network?

CrystEngComm Pub Date: 2011-12-02 DOI: 10.1039/C1CE06182H

Abstract

A Co(II) 1,2,4-benzenetricarboxylate supramolecular network, {Co[C6H3(CO2)2(CO2H)](H2O)2·H2O}n (FJU-4) was synthesized from an unsymmetrical ligand, namely 1,2,4-benzenetricarboxylic acid (H3btc), under pH-controlled hydrothermal conditions. FJU-4 has a 2D layered structure with an interdigitated pendent-arm, composed of a carboxylate- and a water-bridged cobalt chain, which are united to generate a 3D supramolecular structure through interlayer hydrogen bonding and π–π interactions between the phenyl rings, carboxyl groups, and guest water molecules. The assembly of the FJU-4 network is a reversible process, as the result of changes in noncovalent interactions triggered by dehydration and the absorption of moisture. A magnetic analysis showed that FJU-4 exhibits metamagnetic behavior resulting from spin-canting magnetization while heat capacity measurements indicated that FJU-4 undergoes long range magnetic ordering at 2.6 K.

Graphical abstract: Metamagnetic behavior and moisture-absorption induced reversible network assembly of a cobalt-1,2,4-benzenetricarboxylate supramolecular network
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