Synthesis, Photophysical and Nonlinear Optical Properties of Macromolecular Architectures Featuring Octupolar Tris(bipyridine) Ruthenium(II) Moieties: Evidence for a Supramolecular Self-Ordering in a Dentritic Structure
作者:Thomas Le Bouder、Olivier Maury、Arnaud Bondon、Karine Costuas、Edmond Amouyal、Isabelle Ledoux、Joseph Zyss、Hubert Le Bozec
DOI:10.1021/ja030296j
日期:2003.10.1
and nonlinear optical properties of several new multi-octupolar tris(bipyridine) ruthenium complexes are reported. The preparation on these complexes is based on the initial construction of multipodal 4,4'-dialkylaminostyryl-2,2'-bipyridine ligands (DAAS-bpy). Thermally stable polyimides featuring octupolar ruthenium trisbipyridyl complexes have been readily obtained by a polycondensation reaction. The
complex synthesis and catalysis. The utility of this precursor complex is demonstrated in a number of experiments: The counterion of 2 is exchanged by reaction with cinchonidinium Δ-TRISPHAT to give [CpRu(η6-naphthalene)]Δ-TRISPHAT (4; with X-raycrystalstructure). Ligand exchange of 2 in acetonitrile with (Z,Z)-1,5-cyclooctadiene (COD) produces [CpRu(η2:η2-COD)(MeCN)]PF6 (5; with X-raycrystal structure);
Chirality Transfer in Propeller‐Shaped CyclenCalcium(II) Complexes: Metal‐Coordinating and Ion‐Pairing Anion Procedures
作者:Hiroshi Ito、Hiroshi Tsukube、Satoshi Shinoda
DOI:10.1002/chem.201204323
日期:2013.3.4
acid anion, that is, a coordinative chiral carboxylate anion, to the cyclenCa2+ complex induced circular dichroism (CD) signals in the aromatic region by forming a 1:1 mixture of diastereomeric ternary complexes with opposite complexchirality, whilst the corresponding Na+ complexes rarely showed any response. In complexes 1‐Ca2+ and 3‐Ca2+, this chirality‐transfer process was efficiently followed by
Chiral spiro Cu(i) complexes. Supramolecular stereocontrol and isomerisation dynamics by the use of TRISPHAT anions
作者:Virginie Hebbe-Viton、Val?rie Desvergnes、Jonathan J. Jodry、Christiane Dietrich-Buchecker、Jean-Pierre Sauvage、J?r?me Lacour
DOI:10.1039/b515540a
日期:——
Association of enantiopure TRISPHAT anion (1) with chiral spiro [Cu(LL′)2] complexes (LL′ = 2-R-phen, 2, 6-R-bpy, 3, and 2-iminopyridine, 4) leads to an efficient NMR enantiodifferentiation. Variable temperature 1H NMR spectroscopy has been used to determine the isomerisation kinetics of these pseudo-tetrahedral complexes and to evaluate their configurational stability; the latter depending on the structure of the diimine ligands. In the case of the 2-anthracenyl-phen derivative, a decent level of supramolecular stereocontrol was noted (d.e. up to 45%); the configuration of the complex being determined by electronic circular dichroism (ECD).
Syntheses of Enantiopure Bifunctional 2-Guanidinobenzimidazole Cyclopentadienyl Ruthenium Complexes: Highly Enantioselective Organometallic Hydrogen Bond Donor Catalysts for Carbon–Carbon Bond Forming Reactions
作者:Tathagata Mukherjee、Carola Ganzmann、Nattamai Bhuvanesh、John A. Gladysz
DOI:10.1021/om500705s
日期:2014.12.8
aryl-substituted nitroalkenes). The dominant product configurations are identical, showing the chiral ruthenium center to have little influence. The free GBI-R ligand exhibits only modest activity. Unlike most transition-metal-catalyzed reactions, there is no direct interaction of the substrate with the ruthenium; rather, evidence is presented for “second coordination sphere promoted catalysis” mediated by