Structures of NHC Hg(<scp>ii</scp>) and Ag(<scp>i</scp>) complexes and selective recognition of nitrate anion
作者:Qing-Xiang Liu、Zhi-Xiang Zhao、Xiao-Jun Zhao、Qing Wei、Ai-Hui Chen、Hui-Long Li、Xiu-Guang Wang
DOI:10.1039/c4ce01519c
日期:——
atoms in dilute solution. For the open structure of complexes 5 and 8, 5 contains an anionic unit [Hg3Cl8]2−, and 8 is formed as a dimer through two [L3Ag2Cl2] monomers. The study of selective recognition of anions on the basis of fluorescence and UV/vis spectroscopic titrations indicates that macrometallocycle 6 is an effective chemosensor for nitrate anion.
NHC Hg(<scp>ii</scp>) and Pd(<scp>ii</scp>) complexes based on 1,8-dihydroxy-9,10-anthraquinone: synthesis, structure and catalysis
作者:Zhi-Xiang Zhao、Ze-Liang Hu、Shao-Cong Yu、Qing-Xiang Liu
DOI:10.1039/c8nj02029a
日期:——
macrometallocycle for 3) was formed by one biscarbene ligand (L1′ for 1, L2 for 2, and L3 for 3) and one Hg(II) ion. Interestingly, the carbonyl group on the 9-position in complex 1 reacted with two acetonitrile molecules in the presence of the strong base KOtBu through losing one molecule of H2O to form L1′. As a result, two –CH2CN units were introduced to anthraquinone, in which the two –CH2CN units
三种双偶氮盐,1,8-双[3'-(N -R-偶氮酰基)丙氧基] -9,10-蒽醌六氟磷酸盐L 1 H 2(PF 6)2 – L 2 H 2(PF 6)2(R =乙基或甲基吡啶基,偶氮基=咪唑基或苯并咪唑基)和1,3-双[8'-(3'-((N-乙基-咪唑基)丙氧基)蒽醌-1-基氧基]丙烷六氟磷酸酯(L 3 H 2(PF 6)2)以及它们的三种大金属环N-杂环卡宾汞(II)配合物[L 1'制备了[ HgBr 2 ](1),[L 2 Hg](PF 6)2(3)和[L 3 Hg](PF 6)2(3),并通过1 H NMR和13 C NMR光谱和X-进行了表征射线晶体学。在配合物1-3中,每个macrometallocycle(18元macrometallocycle 1,一个18元和两个6元macrometallocycles为2,和28元为macrometallocycle 3)通过一个双卡宾配体(形成大号1'为1,L
Synthesis, structure, and characterization of picolyl‐ and benzyl‐linked biphenyl palladium N‐heterocyclic carbene complexes and their catalytic activity in acylative cross‐coupling reactions
作者:Nalluchamy Muniyappan、Shahulhameed Sabiah
DOI:10.1002/aoc.5421
日期:2020.4
N‐heterocycliccarbene ligands with picolyl (L1H2Br2, L3H2Br2) and benzyl (L2H2Br2, L4H2Br2) linked biphenyl backbone were synthesized and characterized. Their palladium(II) complexes [PdL1]Br2 (1), [PdL2Br2] (2), [PdL3]Br2 (3), and [PdL4Br2] (4) were synthesized by direct method using Pd(OAc)2. All complexes (1–4) were characterized by CHN analysis, electrospray ionization‐MS, nuclear magnetic resonance
合成并表征了具有吡啶基(L 1 H 2 Br 2,L 3 H 2 Br 2)和苄基(L 2 H 2 Br 2,L 4 H 2 Br 2)连接的联苯基骨架的N杂环卡宾配体。他们的钯(II)配合物[PdL 1 ] Br 2(1),[PdL 2 Br 2 ](2),[PdL 3 ] Br 2(3)和[PdL 4 Br 2 ](4)通过直接方法使用Pd(OAc)2合成。所有复合物(1 - 4)通过CHN分析,电喷雾电离质谱,核磁共振,和单晶X射线衍射进行了表征。分子结构证实了Pd(II)中心周围扭曲的方形平面几何形状。它们均在苯基硼酸与苯甲酰氯的酰基Suzuki交叉偶联中显示出良好的催化活性,从而以良好的收率得到二苯甲酮。
N-Heterocyclic carbene copper(<scp>i</scp>), mercury(<scp>ii</scp>) and silver(<scp>i</scp>) complexes containing durene linker: synthesis and structural studies
X = Br; 1b: alkyl = C2H5, X = PF6; 1c: alkyl = n-C3H7, X = Cl; 1d: alkyl = n-C4H9, X = I; 1e: alkyl = 1-PyCH2, X = Br; durene = 1,2,4,5-tetramethylbenzene) and the diimidazolium salt bis[N-(butyl)imidazoliumylmethyl]durene hexafluorophosphate (1f), and their seven NHC copper(I), mercury(II) and silver(I) complexes, [durene(CH2bimyEt)2Cu2I2] (2b), [durene(CH2bimyEt)2HgBr]·0.5[HgBr4] (2c), [durene(CH
二苯并咪唑鎓盐双[ N-(烷基)苯并咪唑鎓基甲基]二烯·2X(1a:烷基= C 2 H 5,X = Br; 1b:烷基= C 2 H 5,X = PF 6;1c:烷基= n -C 3 H 7,X = Cl;1d:烷基=n -C 4 H 9,X = 1;1e:烷基= 1-PyCH 2,X = Br;n= 1 。杜伦 = 1,2,4,5-四甲基苯)和二咪唑鎓盐双[ N-(丁基)咪唑烷基甲基]二茂氮六氟磷酸酯(1f)及其七种NHC铜(I),汞(II)和银(I)配合物[二烯(CH 2 bimyEt)2 Cu 2我2 ](图2b),[杜烯(CH 2 bimyEt)2 HgBr]·0.5 [HgBr 4 ](2C),[杜烯(CH 2 bimy ñ丁基)2汞柱2(CHCN)] [HGI 4 ](2D) ,[ durene (CH 2 imyn Bu) 2 Ag 2(CH 2 CN) 2 ](2e),[durene(CH
Environmental Friendly Azide-Alkyne Cycloaddition Reaction of Azides, Alkynes, and Organic Halides or Epoxides in Water: Efficient "Click" Synthesis of 1,2,3-Triazole Derivatives by Cu Catalyst
An efficientclicksynthesis of 1,2,3‐triazole derivatives from benzyl halides or alkyl halides, epoxides, terminal alkynes, and sodium azides in the presence of copper salts and relative benzimidazole salts have been developed. This procedure eliminates the need to handle potentially organicazides, which are generated in situ. A broad spectrum of substrates can participate in the process effectively