A binuclear Cu(II) complex of a Schiff-base type polyhydroxyl ligand with asymmetrical phenoxo and methoxo bridges: crystal structure and magnetic properties

作者：Zeng, Fanhua; Ni, Jia; Ding, Caixia; Xie, Yongshu^*

来源：Journal of Coordination Chemistry, 2012, 65(13): 2247-2255.

DOI：10.1080/00958972.2012.690867

• Crystal structure
• Cu(II) complex
• O-Bridge
• Magnetic properties

[Cu-2(H4L)(OCH3)(H2O)]center dot 2MeOH (1) has been synthesized from the reaction of 2-hydroxy-5-methylisophthalaldehyde, tris(hydroxymethyl) aminomethane and copper(II) perchlorate in methanol with the Schiff-base polyhydroxyl ligand (H4L)(3-) formed in situ. Single-crystal X-ray structure analysis of 1 reveals a binuclear structure with Cu(II) asymmetrically bridged by a methoxo and a phenoxo group with Cu-O-Cu bridging angles of 102.93(7)degrees and 100.17(7)degrees, respectively. The binuclear Cu(II) moieties utilize the coordinated and noncoordinated alkoxyl groups for formation of intermolecular hydrogen bonds, thus affording a 3-D supramolecular structure. Variable temperature magnetic measurements reveal strong antiferromagnetic coupling in 1 with the 2J-value of -729 cm(-1), which was mediated cooperatively by the methoxo and phenoxo bridges. Magneto-structural correlations are discussed based on the crystal structure.

• 出版日期2012
• 单位汕头大学; 华东理工大学; 湘南学院