|
|||||
|
|
Structural and magnetic properties of O-bridged tetranuclear and binuclear Cu(II) complexes |
|
| Authors: | Yongshu Xie Hui Jiang Albert Sun-Chi ChanQingliang Liu Xiaolong XuChenxia Du Yu Zhu |
| Institution: | a State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, People's Republic of China b Department of Chemistry, University of Science and Technology of China, Hefei 230026, People's Republic of China c Department of Applied Biology and Chemical Technology, The Hongkong Polytechnic University, Hung Hom, Kowloon, Hong Kong d Department of Chemistry, Zhengzhou University, Zhengzhou, Henan 450052, People's Republic of China |
| Abstract: | Two copper(II) complexes Cu4(L1)4] (1) and Cu2(phen)2(HL2)2] (ClO4)2 (2) have been synthesized from two potentially tridentate ligands N-(2-hydroxybenzyl) propanolamine (H2L1) and N-(2-hydroxybenzyl) ethanolamine (H2L2). X-ray analyses revealed that 1 contains a Cu4O4 cubane core, with each two Cu(II) atoms bridged by a pair of alkoxides; 2 has a bis(μ2-phenoxo)-bridged dicopper(II) structure. Variable temperature magnetic measurements of 1 have revealed that the correlation between 2J and the bridge angles φ for 1 shows a very strong antiferromagnetic tendency, i.e. the ferromagnetic and antiferromagnetic interactions cross at the φ of 94.5°. The relatively weak antiferromagnetic interactions (2J=−226.8 cm−1) with respect to the bridge angles (φ=100.4°) for 2 have been ascribed to the pyramidal distortions at the phenoxide oxygen atoms in addition to the unfavorable overlaps of the magnetic orbitals for the highly distorted copper coordination polyhedra. |
| Keywords: | Crystal structures Magnetic properties O-bridge Cu(II) complexes |
| 本文献已被 ScienceDirect 等数据库收录！ | |