N-Heterocyclic carbeneligands bearing hydrophilic and/or hydrophobic chains: Rh(<scp>i</scp>) and Pd(<scp>ii</scp>) complexes and their catalytic activity
作者:Hidetoshi Ohta、Tetsuaki Fujihara、Yasushi Tsuji
DOI:10.1039/b715412g
日期:——
N-heterocyclic carbene (NHC) ligands, were synthesized and characterized. Rh(I)–NHC complexes were prepared in good yields by the silver carbene transfer method with NHC–Ag species derived from the imidazolium salts. The molecular structure of the Rh(I)–NHC complex having n-C12 chains has been determined by a single-crystal X-ray diffraction study and the complex is found to possess extended alkyl chains
Supramolecular organisation of oligo(p-phenylenevinylene) at the air–water interface and in water
作者:Pascal Jonkheijm、Michel Fransen、Albertus P. H. J. Schenning、E. W. Meijer
DOI:10.1039/b103966k
日期:——
aggregate in chiral stacks, as can be concluded from UV–vis, fluorescence and CD spectroscopy. Temperature dependent measurements showed for OPV1 a transition at 50 °C from a chiral aggregated state to disordered aggregates. In the case of bolaamphiphilic OPV2, the transition at 55 °C between those states is a less cooperative process. The chiral order in the assemblies of the bolaamphiphiles can be influenced
Synthesis of a water-soluble hexameric metallomacrocycle and its oxidized single-wall carbon nanotube composite
作者:Pingshan Wang、Charles N. Moorefield、Sinan Li、Juan Manríquez、Carol D. Shreiner、Erika Bustos、Aaron L. Hartley、Luis A. Godínez、George R. Newkome
DOI:10.1039/b702797d
日期:——
Polycationic water-soluble metallomacrocycles possessing 12 positive charges that facilitate ionic coordination with the carboxylate moieties of Oxi-SWNTs form a nanotube composite en route to tailored electronic properties. The multiple ionic pair interactions between the positively charged metallohexamers and carboxylate modified SWNT are evidenced by TEM and AFM images.
Triarylphosphanes with Dendritically Arranged Tetraethylene Glycol Moieties at the Periphery: An Efficient Ligand for the Palladium-Catalyzed Suzuki-Miyaura Coupling Reaction
作者:Pim G. A. Janssen、Joke Vandenbergh、Joost L. J. van Dongen、E. W. Meijer、Albertus P. H. J. Schenning
DOI:10.1021/ja0711967
日期:2007.5.1
A single strand of DNA templates a supramolecular strand of chromophores, yielding a new type of DNA hybrid. In this hybrid construct, an oligothymine is used as the template to which a supramolecular stack of naphthalenes or oligo(phenylene)vinylenes equipped with a complementary diamino triazine unit is hydrogen-bonded.