Properties and ATRP Activity of Copper Complexes with Substituted Tris(2-pyridylmethyl)amine-Based Ligands
作者:Aman Kaur、Thomas G. Ribelli、Kristin Schröder、Krzysztof Matyjaszewski、Tomislav Pintauer
DOI:10.1021/ic502484s
日期:2015.2.16
of a series of novelcopper(I and II) complexes with TPMA-based ligands containing 4-methoxy-3,5-dimethyl-substituted pyridine arms were reported. In the solid state, CuI(TPMA*1)Br, CuI(TPMA*2)Br, and CuI(TPMA*3)Br complexes were found to be distorted tetrahedral in geometry and contained coordinated bromide anions. Pseudo-coordination of the aliphatic nitrogen atom to the copper(I) center was observed
Evaluating the Identity and Diiron Core Transformations of a (μ-Oxo)diiron(III) Complex Supported by Electron-Rich Tris(pyridyl-2-methyl)amine Ligands
作者:Loi H. Do、Genqiang Xue、Lawrence Que、Stephen J. Lippard
DOI:10.1021/ic202379b
日期:2012.2.20
species [Fe2(μ-O)(OH)(H2O)(R3TPA)2](ClO4)3 (1). Facile conversion of the (μ-oxo)(μ-hydroxo)diiron(III) core of 2 to the (μ-oxo)(hydroxo)(aqua)diiron(III) core of 1 occurs in the presence of water and at low temperature. When 2 is exposed to wet acetonitrile at room temperature, the CH3CN adduct is hydrolyzed to CH3COO–, which forms the compound [Fe2(μ-O)(μ-CH3COO)(R3TPA)2](ClO4)3 (10). The identity of 10
End-On Copper(I) Superoxo and Cu(II) Peroxo and Hydroperoxo Complexes Generated by Cryoreduction/Annealing and Characterized by EPR/ENDOR Spectroscopy
作者:Roman Davydov、Austin E. Herzog、Richard J. Jodts、Kenneth D. Karlin、Brian M. Hoffman
DOI:10.1021/jacs.1c10252
日期:2022.1.12
and hydroperoxo complexes. These are prepared by cryoreduction/annealing of the parent [LCuI(O2)]+ Cu(I) dioxygen adducts with the tripodal, N4-coordinating, tetradentate ligands L = PVtmpa, DMMtmpa, TMG3tren and are best described as [LCuII(O2•–)]+ Cu(II) complexes that possess end-on (η1-O2•–) superoxo coordination. Cryogenic γ-irradiation (77 K) of the EPR-silent parent complexes generates mobile
在本报告中,我们研究了单铜 Cu(I) 超氧络合物以及 Cu(II) 过氧络合物和氢过氧络合物的物理和化学性质。这些是通过母体 [LCu(O 2 )] + Cu(I) 双氧加合物与三足、N 4配位、四齿配体 L = PV tmpa、 DMM tmpa、TMG 3 tren 的冷冻还原/退火来制备,并且得到了最好的描述作为[LCu II (O 2 •– )] + Cu(II)配合物,具有端接(η 1 -O 2 •– )超氧配位。 EPR 沉默母体配合物的低温 γ 辐射 (77 K) 从溶剂中产生移动电子,还原冷冻基质内的 [LCu II (O 2 •– )] + ,捕获固定在结构中的还原形式父复合体。冷冻退火,即逐步升高冷冻样品的温度,然后在每个阶段冷却回低温进行检查,跟踪还原产物松弛其结构并经历化学转变。我们采用 EPR 和 ENDOR(电子核双共振)作为强大的光谱工具来检查所形成的状态的性质。令人惊讶的是,Cu(II)
LIGANDS DESIGNED TO PROVIDE HIGHLY ACTIVE CATALYST COMPLEXES
申请人:Carnegie Mellon University
公开号:US20150087795A1
公开(公告)日:2015-03-26
A series of ligands with site specific electron donating substituents that form a catalyst complex with a transition metal and are suitable for catalysis of atom transfer radical reactions, including ATRP are described. Faster catalysis rates were observed allowing for low catalyst concentrations and linear increases in molecular weight with monomer conversion, and narrow molecular weight distributions. Cyclic voltammetry revealed that increasing the strength and number of conjugated electron donating groups resulted in more stable complexes and larger ATRP equilibrium constants.
A method of making a polymer having the structure (I):
wherein L is a linking group, R is a hydrocarbon group or a substituted-hydrocarbon group, and x is 2 or more, preferably from 2 to 100, more preferably from 2 to 50; and wherein each Q}is an identical polymer block or contains a plurality of polymer blocks. The method comprises reacting a di-halo initiator with a selected monomer one or more times and then reacting the resulting moiety with a dithiol compound of the structure HS-R-SH.