Incorporation of Cation Affects the Redox Reactivity of Fe–<i>NNN</i> Complexes on C–H Oxidation
作者:Pathorn Teptarakulkarn、Wanutcha Lorpaiboon、Thana Anusanti、Natchapol Laowiwatkasem、Kittipong Chainok、Preeyanuch Sangtrirutnugul、Panida Surawatanawong、Teera Chantarojsiri
DOI:10.1021/acs.inorgchem.2c00762
日期:2022.7.25
Calculation of dissociation constants showed the tightest binding with a Ba2+ ion. Density functional theory calculations were used to elucidate the effects of redox inactive cations toward the electronic structures of Fe complexes. Although the Fe–NNN complexes, both in the absence and presence of cations, can catalyze C–H oxidation of 9,10-dihydroanthracene, to give anthracene [hydrogen atom transfer (HAT)
路易斯酸等阳离子已被证明可以提高高价铁氧中间体的催化活性。在此,我们提出了一种吡啶二胺乙二醇大环化合物,它可以与NNN位点形成 Zn(II)-或 Fe(III)-络合物,同时允许氧化还原非活性阳离子与乙二醇部分结合。添加碱金属、碱土金属和镧离子导致 Fe(III/II) 氧化还原电位正移。解离常数的计算表明与Ba 2+离子的结合最紧密。密度泛函理论计算用于阐明氧化还原非活性阳离子对 Fe 配合物电子结构的影响。虽然 Fe- NNN配合物,无论是否存在阳离子,都可以催化 9,10-二氢蒽的 C-H 氧化,生成蒽 [氢原子转移 (HAT) 产物]、蒽酮和蒽醌 [氧原子转移 (OAT) 产物] ,最高的总活性和 OAT/HAT 产物比率在双阳离子存在下获得,即分别为 Ba 2+和 Mg 2+。