A novel two-dimensional layered Cu2+ complex based on Dawson-like [H3BiW18O60](6-): synthesis, structure and magnetic properties

作者：He, Shuai; Xin, Ying; Li, Jiansheng; Zhu, Zaiming; Zhao, Peng; You, Wansheng^*

来源：Acta Crystallographica Section C-Structural Chemistry, 2018, 74(11): 1267-+.

DOI：10.1107/S205322961800935X

• polyoxometalate
• POM
• tungstobismuthate
• crystal structure
• copper(II) complex
• Dawson-like polyoxoanion

A novel complex based on the Dawson-like [H3BiW18O60](6-), i.e. (C2H9N2)(2)-[{Cu(C10H8N2)(C2H8N2)}(2)(H3BiW18O60)]center dot 5.5H(2)O or (enH)(2)[{Cu(2,2'-bipy)(en)}(2)(mu(4)-H3BiW18O60)]center dot 5.5H(2)O, (1), where enH is protonated ethane-1,2-diamine, 2,2'-bipy is 2,2'-bipyridine and en is ethane-1,2-diamine, has been synthesized hydrothermally and characterized by elemental analysis, single-crystal X-ray diffraction analysis, IR spectroscopy, powder XRD, and thermogravimetry and differential thermal analysis (TG-DTA). For (1), each [H3BiW18O60](6-) anion acts as a tetradentate ligand connecting [Cu(2,2'-bipy)(en)](2+) fragments via two terminal and two bridging O atoms, forming a two-dimensional network structure. Along the a and c axes, polyoxometalate units are arranged in an AB ... AB manner. The electrochemical behaviour of (1)-CPE (CPE is a carbon paste electrode) was investigated in 2 M H2SO4 solution by cyclic voltammetry (CV). The redox process of W-VI/V takes place at E-1/2 = -0.58 (I-I') and -0.37 V (II-II'), and at -0.04 V (III-III') for Cu-II/0. The magnetic properties of (1) were investigated in the range 2-300 K and indicated the existence of strong antiferromagnetic exchange interactions between the Cu2+ centres.

• 出版日期2018-11
• 单位辽宁师范大学