Issue 10, 2013

Structural diversity and magnetic properties of five copper–organic frameworks containing one-, two-, and three-types of organic ligands

Abstract

Five novel compounds {[Cu(CMA)]·0.8H2O}n (1), {[Cu(CMA)(bpy)0.5]·0.5DMF}n (2), {[Cu(CMA)(bpy)(H2O)]·0.5H2O}n (3), {[Cu2(CMA)(DPA)(bpy)2(H2O)]ClO4}n (4) and {[Cu3(CMA)(DPA)(bpy)4(OH)](ClO4)2·3H2O)}n (5) (H2CMA = 3-(carboxymethoxy)-5-methylbenzoic acid, HDPA = 2-(3,5-dimethylphenoxy)acetic acid, bpy = 4,4′-bipyridine) were synthesized and characterized by single crystal X-ray diffraction. Interestingly, the kinds of ligands included in these compounds are different: 1 contains single-ligand CMA2−; 2 and 3 comprise two kinds of ligands (CMA2− and bpy); 4 and 5 cover three kinds of ligands (CMA2−, DPA and bpy). Structural analyses reveal that 1–3, and 5 are three-dimensional (3D) frameworks, while 4 is a 2D layer. Noteworthily, 1 possesses two types of channels: six-star and hexagonal ones. 3 displays a three-fold interpenetrating 3D framework. The structural diversity of the compounds may have originated from different anions, solvents and temperatures. Variable-temperature magnetic susceptibility measurements were carried out on compounds 1, 2 and 4, and the magnetic properties are dramatically different due to the structural diversities. The magnetic data of 1 shows an antiferromagnetic interaction with J = −54.84 cm−1 estimated from the Bonner–Fisher model. The magnetic data of 2 was least-square fitted to the Blenaey–Bowers equation with J = −131.01 cm−1, indicating the existence of a strong antiferromagnetic interaction between two adjacent Cu2+. The magnetic data of linear tetranuclear structure 4 was best fitted to the expression derived from the Hamiltonian H = −2(2J1S1S2 + J2S1S1*). The best fitting parameters are J1 = −17.48 cm−1 and J2 = −65.26 cm−1, which also indicate an antiferromagnetic interaction. Simultaneously, the magneto-structural relationship was discussed.

Graphical abstract: Structural diversity and magnetic properties of five copper–organic frameworks containing one-, two-, and three-types of organic ligands

Supplementary files

Article information

Article type
Paper
Submitted
25 Aug 2012
Accepted
27 Nov 2012
First published
27 Nov 2012

Dalton Trans., 2013,42, 3455-3463

Structural diversity and magnetic properties of five copper–organic frameworks containing one-, two-, and three-types of organic ligands

B. Shen, P. Shi, Y. Hou, F. Wan, D. Gao and B. Zhao, Dalton Trans., 2013, 42, 3455 DOI: 10.1039/C2DT32515B

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