Synthesis, Characterization, and Catalytic Activities of A Nickel(II) Monoamido-Tetradentate Complex: Evidence For Ni<sup>III</sup>-Oxo and Ni<sup>IV</sup>-Oxo Species
作者:Kwon Hee Bok、Myoung Mi Lee、Ga Rim You、Hye Mi Ahn、Ka Young Ryu、Sung-Jin Kim、Youngmee Kim、Cheal Kim
DOI:10.1002/chem.201605157
日期:2017.3.2
new mononuclear nickel(II) complex, [NiII(dpaq)Cl] (1), containing a tetradentate monoamido ligand, dpaq (dpaq=2‐[bis(pyridin‐2‐ylmethyl)amino]‐N‐(quinolin‐8‐yl)acetamide), has been synthesized and characterized by IR spectroscopy, elemental analysis, and UV/Vis spectroscopy. The structure of the nickel complex has been determined by X‐ray crystallography. This nonheme NiII complex 1 catalyzed the
一种新的单核镍(II)络合物[Ni II(dpaq)Cl](1),其中包含四齿单酰胺配体dpaq(dpaq = 2- [双(吡啶-2-基甲基)氨基] N-(喹啉- 8-基)乙酰胺)已通过红外光谱,元素分析和紫外/可见光谱进行了合成和表征。镍配合物的结构已通过X射线晶体学确定。这种非血红素Ni II络合物1在温和的条件下催化了各种烯烃与间-氯过氧苯甲酸(m- CPBA)的环氧化反应。已提出使用该催化体系进行烯烃环氧化反应,涉及一种新的反应性Ni IV -oxo(4)物种,基于PPAA(过氧苯基乙酸)探针的证据,Hammett研究,H 2 18 O交换实验和ESI质谱分析。此外,溶剂的性质显着影响了Ni-酰基过氧中间体的杂溶和均溶O-O键裂解之间的分配(2)。的O-O键2主要进行通过异裂在质子溶剂,如CH 3 OH。这些结果表明,Ni IV-氧代物质可能是质子溶剂中常见的反应性中间体。两种活性氧化剂,即Ni