A novel inorganic-organic hybrid 3d-4f heterometallic germanotungstate based on saturated Keggin-type [alpha-GeW12O40](4-) polyanion

摘要

An arrestive 2-picolinic acid functionalized 3d-4f heterometallic germanotungstate based on plenary alpha-Keggin [GeW12O40](4-) polyanion [Cu-2(PA)(3)(H2O)(3)[Gd(H2O)(8)](0.5) [Cu-2(PA)(3)(H2O)(4)]H-0.5 [alpha-GeW12O40]center dot 5H(2)O (1) was synthesized by reaction of Na2WO4 center dot 2H(2)O, GeO2, Gd(NO3)(3)center dot 6H(2)O, CuCl2 center dot 2H(2)O and 2-picolinic acid (HPA) in aqueous solution. The polyoxoanion unit of 1 consists of a plenary Keggin [alpha-GeW12O40](4-) anion with a decorated [Cu-2(PA)(3)(H2O)(3)](+) cation and a decorated 3d-4f heterometallic {[Gd(H2O)(8)](0.5)[Cu-2(PA)(3)(H2O)(4)](2.5+) segment and neighboring polyoxoanion units are further expanded into a 1-D chain alignment through unique bridging di-copper [Cu-2(PA)(3)(H2O)(3)](+) linkers. Furthermore, the electrochemical properties of the 1@CMWCNTs-Nafion/GCE electrochemical sensor was investigated, which shows a good stability and a good sensing performance toward the dopamine detection. This research offers the possibility of organic-inorganic hybrid heterometallic germanotungstates for serving as electrode response materials.