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.
Tunable Fluorophores Based on 2-(<i>N</i>-Arylimino)pyrrolyl Chelates of Diphenylboron: Synthesis, Structure, Photophysical Characterization, and Application in OLEDs
作者:D. Suresh、Patrícia S. Lopes、Bruno Ferreira、Cláudia A. Figueira、Clara S. B. Gomes、Pedro T. Gomes、Roberto E. Di Paolo、António L. Maçanita、M. Teresa Duarte、Ana Charas、Jorge Morgado、Maria José Calhorda
DOI:10.1002/chem.201303607
日期:2014.4.1
has a planar aryliminopyrrolyl ligand, except when prevented by steric hindrance (ortho substituents). Calculated absorption maxima reproduce the experimental values, but the error is higher for the emission wavelengths. Organic light‐emitting diodes (OLEDs) have been fabricated with the new boroncomplexes, with luminances of the order of 3000 cd m−2 being achieved for a green‐emitting device.
2-(N-芳基氨基)吡咯(HNC 4 H 3 C(H)N-Ar)与三苯基硼(BPh 3)在沸腾的甲苯中的反应产生了各自的高发射态N,N'-硼螯合物,[BPh 2 κ 2 ñ,N' -NC 4 H ^ 3 C(H)N基-Ar}](AR = C 6 H ^ 5(12),2,6--ME 2 -C 6 H ^ 3(13),2, 6‐ i Pr 2‐ C 6 H 3(14),4-OMe-C 6 H 4(15),3,4-Me 2 -C 6 H 3(16),4-F-C 6 H 4(17),4-NO 2 -C 6 H 4(18),4‐CN‐C 6 H 4(19),3,4,5‐F 3 ‐ C 6 H 2(20)和C 6 F 5(21))中到高产。这些新的硼配合物的光物理性质很大程度上取决于其N-芳基胺基团芳基环上存在的取代基。轴承吸电子苯胺的取代基的复合物17 - 20显示更强烈(例如,φ ˚F = 0
Hydrolysis Kinetic Studies of Schiff Bases Derived from Pyrrolic Aldehydes in Buffered Aqueous Ethanol and Sulfuric Acid Solutions: Structural Effects of Substitutes
作者:Zohra Bengharez、Zineb El Bahri、Abderrezzak Mesli
DOI:10.1002/kin.20777
日期:2013.6
Two series of substituted N‐pyrrolyl‐2‐methylene‐aniline were synthesized and characterized to study their stability in a large domain of pH (0–14) and especially in the H0 domain (–4 to 0). The hydrolysis kinetics of the azomethine group was established in homogeneous media using a thermostated UV–vis spectrophotometer. The hydrolysis mechanism was investigated, and the experimental kinetic constants
Monomethylaluminum and dimethylaluminum pyrrolylaldiminates for the ring-opening polymerization of rac-lactide: effects of ligand structure and coordination geometry
monomethylaluminum pyrrolylaldiminates (1b–7b), respectively, in good yields. The structure of 3b, determined by single-crystal X-ray diffraction, displayed a distorted trigonal bipyramidal geometry with the τ value of 0.65. Upon addition of 1 equivalent of benzyl alcohol, all complexes promoted the living ring-opening polymerization of rac-lactide with a good control over molecular weights and polydispersities. Complexes
由吡咯烷基亚胺配体支撑的两个系列的烷基铝配合物LAlMe 2(1a-7a)和L 2 AlMe(1b-7b)已成功合成并通过NMR光谱和元素分析进行了表征。三甲基铝与相应的吡咯烷基亚胺配体以1:1和1:2的摩尔比反应分别得到了高收率的二甲基铝吡咯烷基铝酸酯(1a-7a)和单甲基铝吡咯烷基铝酸酯(1b-7b)。通过单晶X射线衍射确定的3b的结构显示出扭曲的三角双锥几何形状,其τ值为0.65。加入1当量的苄醇后,所有配合物都促进了rac-丙交酯的活的开环聚合反应,并很好地控制了分子量和多分散性。发现配合物6a和7a在过量当量的苯甲醇(最多5个当量)的存在下有效地介导了永生聚合,如窄的PDI值以及实验的M n值与单体/苯甲醇之间的良好一致性所证明的那样。比率。亚胺氮取代基的空间和电子效应在催化活性和聚合物微观结构上都对聚合活性有很大影响。催化活性降低如下:4-Me-C6 H 4( 3)> C 6
C−H Bond Activation by Unsymmetrical 2-(<i>N</i>-Arylimino)pyrrolide Pt Complexes: Geometric Effects on Reactivity
作者:Carl N. Iverson、Charles A. G. Carter、R. Tom Baker、John D. Scollard、Jay A. Labinger、John E. Bercaw
DOI:10.1021/ja036511d
日期:2003.10.1
Reactions of chloroplatinum methyl complexes with N-(arylimino)pyrrolide anions afford cis and trans neutral platinum methyl complexes. Isomers with methyl trans to the pyrrolide nitrogen activate benzene C-H bonds at 85 degrees C more than 80 times faster than the corresponding cis isomer. In addition, reactions of platinum dimethyl complexes with N-(arylimino)pyrroles (Ar = 4-substituted phenyl)
slower as the size of the substituents increased. Polymerisations of L-lactide using complexes 1–7 and benzyl alcohol as an initiator were carried out giving the rate dependence on steric hindrance (5 < 4 < 3 < 2 < 1) and electronic contribution (6 < 7 < 1). Larger substituents and electron withdrawing groups were found to suppress the polymerisation rates. Despite having C2 symmetry in the crystal
由乙苯的反应合成了7种双(吡咯烷基氨基铝)甲基配合物。 AlMe 3和两个当量 相应的吡咯烷基亚胺配体。修饰的配体具有不同的空间位阻(C 6 H 5(1),2,6-Me 2 C 6 H 3(2),2,4,6-Me 3 C 6 H 2(3),2 6-Et 2 C 6 H 3(4)和2,6- i Pr 2 C 6 H 3(5))和电子贡献(4-CF 3 C 6 H 4(6)和4-OMeC 6 H 4(7))。复合物的晶体结构3-7进行测定和显示出有扭曲三角双锥几何结构(4,6,7)和(中间体之间三角双锥和四方锥几何形状3和5)。对于带有小的邻位取代基的配体,围绕N-C芳基键的旋转很快,并且随着取代基大小的增加而变慢。使用配合物1-7和L-丙交酯聚合苯甲醇作为引发剂,进行了对位阻(5 < 4 < 3 < 2 < 1)和电子贡献(6 < 7 < 1)的速率依赖性。发现较大的取代基和吸电子基团抑制了聚合速率。尽管有Ç