Synthesis of Halomethyl and Other Bipyridine Derivatives by Reaction of 4,4‘-Bis[(trimethylsilyl)methyl]-2,2‘-bipyridine with Electrophiles in the Presence of Fluoride Ion
摘要:
Bipyridine (bpy) ligands figure prominently in many areas of chemistry. Common precursors to many derivatives are the halomethyl-substituted analogues. This report describes a new, high yield route to these valuable compounds via a trimethylsilyl (TMS) intermediate. 4,4'-Dimethyl-2,2'-bpy was reacted with lithium diisopropylamide, and the dianion thus formed was trapped with TMSCl to generate 4,4'-bis[(trimethylsilyl)methyl]-2,2'-bp (1). The TMS group was removed using dry F- sources (TBAF/SiO2 in THF or CsF in DMF) in the presence of BrF2CCF2Br or Cl3CCCl3 to pro duce the bromide 2 or chloride 3 analogues of 4,4'-bis(halomethyl)-2,2'-bipyridine, respectively. The CsF/DMF methodology extends to other electrophiles, including benzaldehyde to give 4,4'-bis(2-hydroxy-2-phenethyl)-2,2'-bpy, 6, as well as to alkyl halides. Benzyl Br, dodecyl Br, and alpha-chloroacetonitrile gave mixtures of di- and monoalkylated products along with the diprotonated product, 4,4'-dimethyl-2,2'-bpy.
A novel series of valencetautomeric (VT) complexes, [Co(Cnbpy)(3,5-DTBQ)2] (Cnbpy = 4,4'-dialkyl-2,2'-bipyridine (alkyl = (C(n)H(2n+1)) where n = 0 (CoC0bpy), 1 (CoC1bpy), 5 (CoC5bpy), 9 (CoC9bpy) and 13 (CoC13bpy); 3,5-DTBQ = 3,5-di-tert-butylsemiquinonate or catecholate), including two previously reported complexes (CoC0bpy and CoC1bpy), were systematically prepared and their properties examined
Novel nano-structured clays were synthesized from cation exchange reaction by the intercalation of rhodium complexes with ligand spacers into clay. Expansion of interlayer space of the modified clays depends on the spacers. A unique conformation of pillar complexes was detected by cross polarization magic angle spinning (CP MAS) NMR.
[EN] BENZO[1,2-B:4,5-B]FURAN DERIVATIVES AS LIGANDS OF RUTHENIUM DYES AND METHODS FOR OBTAINING THEREOF<br/>[FR] DÉRIVÉS DE BENZO[1,2-B:4,5-B]FURANE À TITRE DE LIGANDS DE COLORANTS AU RUTHÉNIUM ET PROCÉDÉS POUR LES OBTENIR
申请人:SYNTHEX TECHNOLOGIES SP Z O O
公开号:WO2016111636A1
公开(公告)日:2016-07-14
The present invention relates to a novel ligand for the synthesis of the photosensitizer ruthenium complexes for uses in DSSC, wherein said ligand comprise in their structure benzodifuran moiety bound directly or by a multiple bond with the 2,2'-bipyridine system in positions 4,4' or fluorene system and methods for preparing of said ligand. The subject of the invention is also a new symmetric or asymmetric photosensitizing ruthenium complex for use in DSSC derived from said ligand and methods for preparation of said complex. The resulting complexes have high molar extinction coefficients in the range of visible light and are stable in air environment and after exposure to sunlight, and may be used for the producing of Dye- Sensitized Solar Cells (DSSC). Developed methods are advantageous due to the mild reaction conditions, high repeatability and moderation or high yields.
Photoinduced electron-transfer reactions of micelle-forming surfactant ruthenium(II) bipyridyl derivatives
作者:Farid M. el Torki、Russell H. Schmehl、Wayne F. Reed
DOI:10.1039/f19898500349
日期:——
emission maximum for complexes of the type [(bpy)2 Ru(L-L]2+ L-L = surfactant bipyridine, exhibits a bathochromic shift of ca. 15 nm upon micellization. Luminescence quenching of one complex, [(bpy)2Ru(MC17)2+(MC17 = 4-methyl-4′-heptadecyl-2-2′-bipyridine), with methyl viologen (MV2+) was examined as a function of the surfactantcomplex concentration by both static and dynamic luminescence measurements. Quenching
Novel metal catalysts comprising nitrogen-containing aromatic ligands and use thereof
申请人:Universiteit van Amsterdam
公开号:EP1905786A1
公开(公告)日:2008-04-02
The present invention discloses a metal catalyst for living radical polymerization having a structure M2+(Y)4(X)2 wherein M is a transition metal selected from the group of Mn, Fe, Co, Zr, Ru, Rh and Os, each Y independently is a nitrogen-containing aromatic mono-ring ligand, at least one ring being substituted on at least one position with a carbon-containing substituent and, optionally, either two or four ligands Y being covalently bonded to each other in pairs, and X is selected from H2O, CH3CN, (CH3)2SO, NH3, and a mono-, di- or tri (C1-C4)-alkyl amine. A preferred catalysts is [Ru(H2O)2(4,4'-dialkyl-2,2'-dipyridyl)2](NO3)2. The catalyst advantageously enables the synthesis of polymers with high molecular weights and low polydispersities from monomer compounds containing a vinyl group.
本发明公开了一种活自由基聚合金属催化剂,其结构为 M2+(Y)4(X)2,其中 M 是选自 Mn、Fe、Co、Zr、Ru、Rh 和 Os 组的过渡金属,每个 Y 独立地是含氮芳香族单环配体、至少有一个环在至少一个位置上被含碳取代基取代,可选择两个或四个配体 Y 成对共价键合,X 选自 H2O、 CN、(CH3)2SO、NH3 和单-、二-或三-(C1-C4)-烷基胺。首选催化剂是[Ru( )2(4,4'-二烷基-2,2'-二吡啶基)2](NO3)2。这种催化剂的优点是可以用含有乙烯基的单体化合物合成分子量高、分散性低的聚合物。