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Dinuclear triply bridged copper(II)-carboxylato compounds with different bischelating ligands: Synthesis, crystal structure, spectroscopic and magnetic properties |
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| Authors: | Chatkaew Chailuecha Chaveng Pakawatchai Gerard A. van Albada |
| Affiliation: | a Department of Chemistry, The School of Science and Technology, Naresuan University Phayao Campus, Phayao 56000, Thailand b Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand c Department of Chemistry, Faculty of Science, Prince of Songkla University, Hatyai, Songkla 90112, Thailand d Department of Physics, Faculty of Science and Technology, Thammasart University Rangsit, Pathumthani 12120, Thailand e Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands |
| Abstract: | Three new triply bridged dinuclear copper(II) compounds containing carboxylato bridges, [Cu2(μ-CH3COO-κ-O1,O2)2(μ-CH3COO-κ-O1)(dpyam)2](BF4) (1), [Cu2(μ-CH2CH3COO-κ-O1,O2)(μ-OH)(μ-OH2)(bpy)2](ClO4)2 (2) and [Cu2(μ-CH3COO-κ-O1,O2)(μ-OH)(μ-OH2)(phen)2](ClO4)2 (3) (in which dpyam = di-2-pyridylamine, bpy = 2,2-bipyridine, phen = phenanthroline), have been synthesized in order to investigate the magnetic super-exchange pathway between coupled copper(II) centres. All three compounds display a distorted square-pyramidal arrangement around each copper(II) ion with a CuN2O3 chromophore. Compound 1 has three acetato bridges, two of which connect each square pyramid at two equatorial sites in a triatomic bridging mode and the third acetato bridge acts at the apical site in the monoatomic bridging mode. The structures of compounds 2 and 3 are mutually similar. In each dinuclear unit, both copper(II) ions are linked at two equatorial positions through a hydroxo bridge and a triatomic carboxylato bridge and at the axial position through a water molecule.The magnetic susceptibility measurements, measured from 5 to 300 K, revealed an antiferromagnetic interaction between the Cu(II) ions in compound 1 and a ferromagnetic interaction for compounds 2 and 3 with singlet-triplet energy gaps (J) of −56, 149 and 120 cm−1, for compounds 1, 2 and 3, respectively. |
| Keywords: | Copper(II) complexes EPR Crystal structure Carboxylate-bridged Triply bridged complex Magnetism |
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