Synthesis, structural and magnetic properties of diphenoxo-bridged binuclear mixed-ligand Cu(II) complexes |
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| Authors: | Yong-Shu Xie |
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| Institution: | Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China |
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| Abstract: | The copper(II) complexes Cu2(phen)2(HL1)2] (ClO4)2 (1) and Cu2(phen)2(HL2)2] (ClO4)2 (2) synthesized from two potentially tridentate ligands N-(2-hydroxybenzyl) propanolamine (H2L1) and N-(5-methyl-2-hydroxybenzyl) propanolamine (H2L2) have centrosymmetric bis(μ2-phenoxo)-bridged dicopper(II) structures. Variable temperature magnetic measurements have revealed the existence of relatively weak antiferromagnetic interactions (1: 2J=−212.5, 2: 2J=−337.0 cm−1) with respect to the bridging angles (1: θ=101.47(18)°, 2: θ=102.79(12)°). The results suggest that the distortion index of the Cu(II) atoms (1: τ=0.73, 2: τ=0.53) may be the major factor governing the spin coupling between the copper(II) centers of these diphenoxo-bridged binuclear complexes. The coordination moieties of complex 1 are connected into a 1D linear structure via intermolecular hydrogen bonds between alkoxyl, amine, and perchlorate groups. |
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| Keywords: | Copper(II) complexes Crystal structures Magnetic properties Binuclear complexes Mixed-ligand complexes |
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