Polynuclear manganese complexes of 2,5-dihydroxyterephthalaldehyde (dhterH₂) and its Schiff base polymer ligand (PdhterenH₂) [Mn^II(dhter)]_n, [Mn_n^II(Pdhteren)] and [Mn_n^III(Pdhteren)(OAc)_n] were synthesized. The manganese complexes were characterized by elemental analysis, thermal analysis, IR and EPR spectroscopic techniques. Catalytic epoxidation of olefins with hydrogen peroxide was studied using the above manganese complexes under heterogenized homogeneous reaction conditions in the presence of a base. The effect of imidazole and olefin concentrations on effective oxygen transfer were studied. [Mn_n^II(Pdhteren)] and [Mn_n^III(Pdhteren)(OAc)_n] are more efficient than the oxygen-bonded manganese complex [Mn^II(dhter)]_n for the activation of hydrogen peroxide.

中文翻译：

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2,5-二羟基对苯二醛多核锰配合物的合成，表征及催化活性与H ₂ O ₂的烯烃环氧化

2,5-二羟基对苯二甲醛（dhterH ₂）及其席夫碱聚合物配体（PdhterenH ₂）[Mn ^II（dhter）] _n，[Mn _n ^II（Pdhteren）]和[Mn _n ^III（Pdhteren）（OAc） ）_n ]被合成。通过元素分析，热分析，IR和EPR光谱技术对锰配合物进行了表征。在碱的存在下，在异质均相反应条件下，使用上述锰配合物研究了烯烃用过氧化氢的催化环氧化反应。研究了咪唑和烯烃浓度对有效氧转移的影响。[Mn _n ^II（Pdhteren）]和[Mn _n ^III（Pdhteren）（OAc）_n ]比氧键合的锰络合物[Mn ^II（dhter）] _n更有效地活化过氧化氢。