Hybrid compounds of Keggin polyoxotungstate with transition metal ion as the central atom. Synthesis, structure and properties

作者：Li, Xiao-Min; Chen, Ya-Guang^*; Shi, Tian

来源：Solid State Sciences, 2016, 52: 112-117.

DOI：10.1016/j.solidstatesciences.2015.12.011

• Polyoxotungstate
• Cobalt
• Nickel
• 4,4 '-bipyridine
• Magnetic property

The compounds (Hbipy)(2)[Co(bipy)(2)(H2O)(4)](2)(CoW12O40)center dot 2bipy center dot 7H(2)O (1) and [Ni-2(Hbipy)(2)(bipy)(H2O)(4) (H2W12O40)]center dot 5H(2)O (2) (bipy = 4,4-bipyridine) were synthesized hydrothermally and characterized by elemental analysis, IR spectroscopy, TG analyses, solid ultraviolet diffuse spectroscopy and single crystal X-ray diffraction method. In 1 the complex ions, [Co(bipy)(2)(H2O)(4)](2+), construct a supramolecular layer through pi-pi stacking interaction. The heteropolyanions with central Co atom and supramolecular layers are linked by hydrogen bonds. In 2 a 2D structure is formed from metatungstate anions and binuclear Ni-bipy complexes through the coordination of metatungstate anions and bipy to Ni ions. Between the layers and bipyridine molecules are the hydrogen bond interactions. The formation of 1 and 2 shows that the solution acidity and metal ions influence greatly the structure of the compounds. Solid ultraviolet diffusion results indicate that the compounds 1 and 2 are potential semiconductor materials. In 1 and 2 there exists a weak antiferromagnetic interaction.

• 出版日期2016-2
• 单位东北师范大学; 伊犁师范大学