Synthesis and characterization of copper and nickel complexes with N-arylpyrrole-2-aldimines
摘要:
A series of 17N-arylpyrrole-2-aldimine ligands has been synthesized by condensation of pyrrole-2-carboxaldehyde and substituted anilines. All CuL2 complexes are square, whereas NiL2 compounds are square, tetrahedral or eventually present a square half arrow right over half arrow left tetrahedral equilibrium. Attempts of chemical oxidation have shown the existence of nickel(III) and copper(III) in solution.
The behavior of pyrrolyl ligands within the rare-earth metal alkyl complexes. Insertion of CN and CO double bonds into Ln–σ-C bonds
作者:Yi Yang、Dongmei Cui、Xuesi Chen
DOI:10.1039/b926038b
日期:——
reactions of lanthanide tris(alkyl)s or lanthanide mono-Cp′ (Cp′ = (C5Me4)SiMe3) bis(alkyl)s with pyrrolyl ligands, and the η5- or η1-coordination mode of the pyrrolyl ring, as well as CN and CO double bonds insertion into Ln–σ-C moities. N,N,O-tridentate ligand HL1, 2-(2-CH3OC6H3NCH)–C4H3NH, was prepared. Treatment of HL1 with rare-earth metal tris(alkyl)s, Ln(CH2SiMe3)3(THF)2, generated centrosymmetric bimetallic
本文介绍了镧系元素三(烷基)或镧系元素单Cp'(Cp′=(C 5 Me 4)SiMe 3)双(烷基)与吡咯基配位体,和η 5 -或η 1种-coordination模式吡咯环,以及为C N和C Ò双键插入LN-σ- C 情绪。 N,N,O三齿配体HL 1,2-(2--CH 3 OC 6 H ^ 3 Ñ CH)-C 4 H ^ 3 NH,制备。用稀土金属三(烷基)s,Ln(CH 2 SiMe 3)3(THF)2处理HL 1,生成中心对称的双金属双金属(吡咯基乙二氨基)镧系单(烷基)络合物[2-(2-CH 3 OC 6 H 3 NC(H)R)–C 4 H 3 N} LnR] 2(1a:Ln =ÿ; 1b:Ln =鲁)(R = CH 2 SiMe 3)。在这个过程中,HL 1是由金属烷基去质子化和其亚氨基Ç N组是由分子内烷基化失活,从而产生桥接两个金属烷基单元在η双阴离子物种5 /η 1:κ
Synthesis of two nickel (II) complexes bearing pyrrolide-imine ligand and their catalytic effects on thermal decomposition of ammonium perchlorate
(TG). Compared with the thermaldecomposition of pure AP, the decomposition temperatures were decreased by 27 °C, 77 °C, 88 °C and 172 °C, respectively when 1a , 1b , 2a and 2b were added in AP. The results indicated that the Ni(II) complex 2b bearing ferrocene-based pyrrolide-imine N,N-chelate ligand displayed an excellent catalytic efficiency on the thermaldecomposition of AP.
摘要 两种吡咯亚胺螯合 Ni(II) 配合物 [2-(2-CH 3 OC 6 H 4 -NCH)C 4 H 3 N] 2 Ni ( 2a ) 和 [(Fc-NCH)]C 4 H 3 N] 2 Ni ( 2b , Fc = 二茂铁)} 通过用 0.5 当量处理相应的希夫碱来制备。NiCl 2 ·6H 2 O 中等产率。2a和2b的晶体结构通过单晶X射线衍射确定。2a 的原子 Ni(II) 由两个反位的吡咯烷亚胺配体配位,以显示扭曲的八面体配位几何形状。2b 的 Ni(II) 具有扭曲的方形平面几何形状,与两个二茂铁基吡咯亚胺配体键合,配体的每个二茂铁和吡咯均采用反式构象。研究了紫外-可见光谱和电化学测量。通过差示扫描量热法(DSC)和热重法(TG)研究了配合物对高氯酸铵(AP)热分解的催化效率。与纯AP热分解相比,在AP中加入1a、1b、2a和2b时,分解温度分别降低了27℃、77℃、88
Oligo- and polymerization of ethylene by pyrrolide-imine chromium catalysts bearing pendant O-, S- and N-donor groups. Synthesis, characterization and DFT studies
作者:Sabrina M. da Silva、Adriana C. Pinheiro、Miriã T. da Costa、Thiago C.G. Alves、Robson S. Oliboni、Rafael Stieler、Adriana C.A. Casagrande、O.L. Casagrande
DOI:10.1016/j.mcat.2022.112495
日期:2022.8
production of a varied amount of polymer (6.9 - 91.5 wt.%). The nature of the pendantgroup has a significant impact on the catalytic performances of these Cr complexes. Particularly, catalytic precursors containing pendant O-donor groups (Cr1-Cr3) produce mostly oligomers (up to 89.0 wt%) while those bearing sulfur-base donor groups (Cr4 and Cr5) are primarily polymerization systems. DFT calculations suggested
由带有侧O-、S-和N-供体基团 [Cr(C 4 H 3 N-2-CH=N)Z的吡咯烷-亚胺配体支持的一组新铬 (III) 配合物的合成和乙烯反应性}(THF)Cl 2 ] (Z = CH 2 Ph-2-OMe, Cr1 ; Z = Ph-2-OPh, Cr2 ; Z = Ph-2-OMe, Cr3 ; Z = Ph-2-SPh, Cr4 ;描述了 Z = Ph-2-SMe,Cr5;Z = CH 2 Py,Cr6;Z = C 2 H 4 Py,Cr7 )。Cr1-Cr7的活化与 MAO 生成活性体系,提供乙烯 (C 4 -C 12 + )的全范围低聚,转换频率 (TOF) 在 13,900–94,200 mol(ethylene)·mol(Cr) –1 ·h –1范围内,以及生产不同数量的聚合物(6.9 - 91.5 wt.%)。侧基的性质对这些 Cr 配合物的催化性能有显着影响。特别是,含有侧氧供体基团(Cr1
Cobalt complexes with N-arylpyrrole-2-aldimine: structural study by nuclear magnetic resonance
作者:Aminou Mohamadou、Jean-Pierre Barbier、René P. Hugel