First row transition metal complexes of a hexadentate pyrazole-based bispidine ligand
摘要:
The efficient synthesis of a new hexadentate pyrazole-based bispidine-ligand and its first-row transition metal complexes (Fe-II, Co-II, Ni-II, Cu-II and zn(II)) is reported. There are interesting structural differences between the present and earlier hexadentate bispidine ligands (tetragonally versus trigonally distorted octahedral geometries). The structural analysis of the metal-free ligand and the five complexes shows that the structure enforced by the rigid pyrazole-based bispidine is best described as distorted trigonal prismatic, and this also emerges from the spectroscopic analysis. (C) 2012 Elsevier Ltd. All rights reserved.
Crystal structures and properties of the tetrathiafulvalene substituted bispyrazol ligand and its rhenium(I) tricarbonyl complex
作者:Gao-Nan Li、Ya Liao、Tao Jin、Yi-Zhi Li
DOI:10.1016/j.inoche.2013.05.022
日期:2013.9
Abstract The new tetrathiafulvalene-functionalized bispyrazole ligand ( L ) and the corresponding tricarbonylrhenium(I) complex ( 4 ) have been synthesized and structurally characterized. Their absorption spectra and redox behaviors have been recorded, and the absorption spectral changes of L upon addition of NOPF 6 have also been studied in detail.
摘要 合成了新的四硫富瓦烯功能化的双吡唑配体 ( L ) 和相应的三羰基铼 (I) 配合物 ( 4 ) 并对其进行了结构表征。已经记录了它们的吸收光谱和氧化还原行为,并且还详细研究了添加 NOPF 6 后 L 的吸收光谱变化。
Bis(pyrazolyl)methane Copper Complexes as Robust and Efficient Catalysts for Sonogashira Couplings
作者:Julian Moegling、Andreas D. Benischke、Jeffrey M. Hammann、Nynke A. Vepřek、Florian Zoller、Bettina Rendenbach、Alexander Hoffmann、Holger Sievers、Michael Schuster、Paul Knochel、Sonja Herres-Pawlis
DOI:10.1002/ejoc.201501117
日期:2015.12
A series of bis(pyrazolyl)methane copper complexes were found to catalyze a fast palladium-free Sonogashira coupling reaction of several iodoarenes with terminal alkynes such as phenylacetylene, propargyl benzyl ether, and (tert-butyl-dimethyl)silylacetylene. These reactions proceed with CuCl2·2H2O (10 mol-%) under aerobic conditions and the corresponding chelate ligand (10 mol-%), with its tailored
tricarbonylmanganese(I) complexes [Mn(bpeaCH2C6H4R)(CO)3]PF6 incorporating a functionalized 2,2-bis(pyrazolyl)ethylamine (bpea) ligand with R = I, C≡CH, and CHO have been explored for their utility in bioorthogonal coupling to carrier peptides bearing N-terminal alkyne, azide, and aminoxy residues. As a model system, the transforming growth factor β-recognizing (TGF-β) peptide sequence R′-Leu-Pro-
在这项工作中,面部三羰基锰 (I) 配合物 [Mn(bpeaCH2C6H4R)(CO)3]PF6 结合了功能化的 2,2-双(吡唑基)乙胺 (bpea) 配体,R = I、C≡CH 和 CHO 已被探索了它们在与带有 N 端炔烃、叠氮化物和氨氧基残基的载体肽进行生物正交偶联中的效用。作为模型系统,使用转化生长因子 β-识别 (TGF-β) 肽序列 R'-Leu-Pro-Leu-Gly-Asn-Ser-His-OH,其中 R' 是与金属络合物功能。使用无催化剂的肟连接提供了最稳定的偶联物,即使在重复冻融循环后,HPLC 96 小时内也没有观察到降解。使用肌红蛋白测定法研究了母体复合物和功能化肽的光活化 CO 递送至血红素蛋白的情况,发现它们具有基本相同的释放特性。这项工作建立了一种将光活化 CO 释放分子 (PhotoCORMs) 结合到生物载体系统的新策略。
Enhanced catalytic activity of copper complexes in microgels for aerobic oxidation of benzyl alcohols
act as nanoreactors providing a tailored environment and stabilization for the copper complexes thus increasing the product yield. The oxidation of benzyl alcohols to their respective aldehydes was chosen as a test reaction to show the enhancement of catalytic activity due to the immobilization of the copper complex compared to the copper salt and the molecular copper complex.
Tuning the catecholase activity of bis(pyrazolyl)methane-based copper(II) complexes by substitutions of the ligand core: unraveling a dual O2/H2O2 oxidation mechanism
作者:Nuwanthaka P. Jayaweera、Ashley E. Hall、Ashton A. Wilson、Mary E. Konkle、Kraig A. Wheeler、Radu F. Semeniuc
DOI:10.1016/j.ica.2020.119507
日期:2020.6
a bridge between two copper(II) centers; the remaining coordination sites of the metals are filled by the deprotonated N-amide atoms, the nitrogen atoms originating from the bis(pyrazolyl)methane groups and one exogenous hydroxide bridge. The catecholase-type activity of these dicopper complexes was studied in methanol, using a combination of aerobic and anaerobic methods. These investigations revealed