activity and the mechanism of di-iron catalysts for aziridination of styrenes using phenyltosyliodinane (PhINTs). In addition, we have developed a similar mono-iron catalyst which operates under the same mechanism albeit with a reduced activity. DFT calculations were performed to investigate the structure and electronic structure of the FeIVNTs species of the latter catalyst. They suggest that the reaction
[EN] IRON BISPHENOLATE COMPLEXES AND METHODS OF USE AND SYNTHESIS THEREOF<br/>[FR] COMPLEXES BISPHÉNOLATES DE FER ET LEURS PROCÉDÉS D'UTILISATION ET DE SYNTHÈSE
申请人:UNIV PRINCE EDWARD ISLAND
公开号:WO2013053046A1
公开(公告)日:2013-04-18
The present application, relates to iron bisphenolate complexes and methods of use and synthesis thereof. The iron complexes are prepared from tridentate or tetradentate ligands of Formula I: wherein R1 and R2 are as defined herein. Also provided are methods and processes of using the iron bisphenolate complexes as catalysts in cross-coupling reactions and in controlled radical polymerizations.
Cobalt amino-bis(phenolate) complexes for coupling and copolymerization of epoxides with carbon dioxide
作者:Kenson Ambrose、Katherine N. Robertson、Christopher M. Kozak
DOI:10.1039/c9dt00996e
日期:——
up to 98% polymer selectivity and up to 97% carbonate linkages. By comparison, Co(II) compounds 1 and 2 bearing alkyl groups on the phenolate donors were inactive for ROCOP. Structural characterization of 3 by X-ray diffraction (and supported by massspectrometry and elemental analysis) showed the potassium acetate (KOAc), which formed as a synthetic by-product, remains coordinated to the Co[L3] unit
As part of our effort to improve our understanding of aziridination mechanism, we used tetra substitution of a diphenol ligand to modify the redox properties of corresponding Fecomplexes. This allowed us to confirm that aziridination catalysis by Fe‐basedcomplexes is governed by electron affinity of the active species and further show that it correlates with the FeIII/FeII redox potential.
为了提高对叠氮化机理的理解,我们使用了双酚配体的四取代来修饰相应的Fe配合物的氧化还原特性。这使我们能够确认铁基络合物的叠氮化催化作用受活性物质的电子亲和力控制,并进一步表明它与Fe III / Fe II氧化还原电位相关。
Discrete Ti−O−Ti Complexes: Visible‐Light‐Activated, Homogeneous Alternative to TiO
<sub>2</sub>
Photosensitisers
作者:Kira Behm、Eszter Fazekas、Martin J. Paterson、Filipe Vilela、Ruaraidh D. McIntosh
DOI:10.1002/chem.202001678
日期:2020.8.3
A series of novel bimetallic TiIV amine bis(phenolate) complexes was synthesised and fully characterised. X‐ray crystallography studies revealed distorted octahedral geometries around the Ti centres with single or double oxo‐bridges connecting the two metals. These robust, air‐ and moisture‐stable complexes were employed as photosensitisers generating singlet oxygen following irradiation with visible
合成并充分表征了一系列新型双金属 Ti IV胺双(酚盐)配合物。 X射线晶体学研究揭示了钛中心周围扭曲的八面体几何形状,并有单或双氧桥连接两种金属。这些坚固、空气和湿气稳定的复合物被用作光敏剂,在商用流动反应器中用可见光 (420 nm) LED 模块照射后产生单线态氧。所有五种配合物在 α-萜品烯的光氧化中均表现出高活性,并在环境温度下四小时内完全转化为蛔苷。使用传统 TiO 2催化剂的对照实验证明了这些光敏剂对蛔苷(相对于转化为对伞花烃)的优异选择性。使用游离前配体以及单金属类似物的进一步比较研究强调了“TiO 2类”部分在多金属催化剂中的重要性。计算研究用于确定配体到金属电荷转移(LMCT)状态和每个配合物的单重态-三重态间隙的性质,整个系列的紫外-可见吸收光谱的计算趋势与实验结果非常吻合。