Issue 36, 2008

2[Cu25-btb)(μ-OH)(μ-H2O)]: a two-dimensional coordination polymer built from ferromagnetically coupled Cu2 units (btb = benzene-1,2,3-tricarboxylate)

Abstract

Hydrothermal reaction of Cu(NO3)2·3H2O, Cd(OH)2 or Zn(OH)2 with benzene-1,2,3-tricarboxylic acid (H3btb, hemimellitic acid) produced the 2D coordination polymer (MOF) 2[Cu25-btb)(μ-OH)(μ-H2O)] (1) and the 2D hydrogen-bonded complexes [Cd(H2btb)2(H2O)4]·2H2O (2) and [Zn(H2O)6](H2btb)2·4H2O (3) which are characterized by single-crystal X-ray diffraction, X-ray powder diffraction and thermoanalysis. Magnetic susceptibility measurements between 1.9–300 K for 1 revealed three magnetic active exchange pathways that link the copper(II) ions through a long μ-aqua bridge, an antisyncarboxylate bridge [j2 = 0.161(1) cm−1], and through a mixed μ-hydroxo +synsyncarboxylate bridge [J = 83(1) cm−1]. At temperatures higher than 30 K the system behaves as isolated Cu2 units with strong ferromagnetic Cu–Cu coupling through the μ-hydroxo and synsyncarboxylate bridge. The strong ferromagnetic coupling is explained with Hoffmann's approach by means of the concept of counter-complementarity introduced by Nishida et al.[Chem. Lett., 1983, 1815–1818]

Graphical abstract: 2 ∞ [Cu2(μ5-btb)(μ-OH)(μ-H2O)]: a two-dimensional coordination polymer built from ferromagnetically coupled Cu2 units (btb = benzene-1,2,3-tricarboxylate)

Supplementary files

Article information

Article type
Paper
Submitted
05 Mar 2008
Accepted
14 May 2008
First published
15 Jul 2008

Dalton Trans., 2008, 4877-4884

2[Cu25-btb)(μ-OH)(μ-H2O)]: a two-dimensional coordination polymer built from ferromagnetically coupled Cu2 units (btb = benzene-1,2,3-tricarboxylate)

H. A. Habib, J. Sanchiz and C. Janiak, Dalton Trans., 2008, 4877 DOI: 10.1039/B803813A

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