Synthesis and Structure of Ti-, Zr- and Hf-Containing Polyoxotungstates and Study of their Oxidation Catalysis Properties

我们计划合成新型的，离散分子的多钨酸盐取代的前过渡金属在高氧化态，如TiVI，ZrVI，HfVI。Kortz小组在含钛多钨酸盐的合成和结构表征方面积累了丰富的经验。最近，我们还分离出一些Zr-和Hf-取代的衍生物，包括过氧物种。Kortz集团的这种合成技术与Kholdeeva集团在使用含Ti和Zr的多钨酸盐进行均相选择性氧化催化方面的丰富经验完美匹配。由新西伯利亚的Kholdeeva集团研究了由不莱梅的Kortz集团在固态（IR、拉曼、元素分析、TGA、单晶XRD）和溶液（UV-vis、电化学、多核NMR）中合成和结构表征的新型聚阴离子的均相催化潜力（特别是用环境友好的氧化剂-过氧化氢水溶液氧化烯烃和芳烃）。

We plan to synthesize novel, discrete-molecular polyoxotungstates substituted by early transition metals in high oxidation states, such as TiVI, ZrVI, HfVI. The Kortz group has documented experience in the synthesis and structural characterization of Ti containing polyoxotungstates. Very recently, we have also isolated some Zr- and Hf-substituted derivatives including peroxo-species. This synthesis know-how of the Kortz group matches perfectly with the extensive experience of the Kholdeeva group in homogeneous selective oxidation catalysis using Ti- and Zr-containing polyoxotungstates. The novel polyanions synthesized and structurally characterized in the solid state (IR, Raman, elem. analysis, TGA, single-crystal XRD) and in solution (UV-vis, electrochemistry, multinuclear NMR) by the Kortz group in Bremen will be investigated for their homogeneous catalysis potential (in particular oxidation of olefins and aromatics with environmentally benign oxidant - aqueous hydrogen peroxide) by the Kholdeeva group in Novosibirsk.