Relevant articles and documents
All total 12 Articles be found
All total 12 Articles be foundSpatially controlled Suzuki and Heck catalytic molecular coupling
Davis, Jason J.,Bagshaw, Claire B.,Busuttil, Katerina L.,Hanyu, Yuki,Coleman, Karl S.
, p. 14135 - 14141 (2006)
The initiation and control of chemical coupling has the potential to offer much within the context of "bottom up" nanofabrication. We report herein the use of a palladium-modified, catalytically active, AFM probe to initiate and spatially control surface-
Mechanochemical ruthenium-catalyzed olefin metathesis
Do, Jean-Louis,Mottillo, Cristina,Tan, Davin,trukil, Vjekoslav,Frii, Tomislav
, p. 2476 - 2479 (2015)
We describe the development of a mechanochemical approach for Ru-catalyzed olefin metathesis, including cross-metathesis and ring-closing metathesis. The method uses commercially available catalysts to achieve high-yielding, rapid, room-temperature metathesis of solid or liquid olefins on a multigram scale using either no or only a catalytic amount of a liquid.
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Caubere,Moreau
, p. 2637,2645 (1970)
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Caubere,Moreau
, p. 2469 (1969)
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Variation of formal hydrogen-bonding networks within electronically delocalized π-conjugated oligopeptide nanostructures
Wall, Brian D.,Zhou, Yuecheng,Mei, Shao,Ardoa, Herdeline Ann M.,Ferguson, Andrew L.,Tovar, John D.
, p. 11375 - 11385 (2015/01/08)
This photophysical study characterizes the generality of intermolecular electronic interactions present within nanomaterials derived from self-assembling oligopeptides with embedded π-conjugated oligophenylenevinylene (OPV) subunits stilbene and distyrylbenzene that in principle present two distinct β-sheet motifs. Two different synthetic approaches led to oligopeptides that upon self-assembly are expected to self-assemble into multimeric aggregates stabilized by β-sheet-like secondary structures. The target molecules express either two C-termini linked to the central OPV core (symmetric peptides) or the more common N-termini to C-termini polarity typical of natural oligopeptides (nonsymmetric peptides). Both peptide secondary structures were shown to form extended 1-D peptide aggregates with intimate intermolecular π-electron interactions. Differences in length of the π-conjugated OPV segments resulted in differing extents of intermolecular interactions and the resulting photophysics. The peptides containing the shorter stilbene (OPV2) units showed little ground state interactions and resulted in excimeric emission, while the longer distyrylbenzene (OPV3) peptides had different ground state interactions between adjacent π-conjugated subunits resulting in either perturbed electronic properties arising from exciton coupling or excimer-like excited states. Molecular dynamics simulations of nascent aggregate formation predict peptide dimerization to be a spontaneous process, possessing thermodynamic driving potentials in the range 2-6 kcal/mol for the four molecules considered. Antiparallel stacking of the peptides containing an OPV3 subunit is thermodynamically favored over the parallel orientation, whereas both arrangements are equally favored for the peptides containing an OPV2 subunit. This study validates the generality of peptide-π-peptide self-assembly to provide electronically delocalized supramolecular structures and suggests flexibility in peptide sequence design as a way to tune the material properties of π-conjugated supramolecular polymers.
Consecutive palladium-catalyzed Hiyama-Heck reactions in aqueous media under ligand-free conditions
Gordillo, Alvaro,De Jesus, Ernesto,Lopez-Mardomingo, Carmen
, p. 4056 - 4058 (2008/03/14)
Symmetric and asymmetric (E)-1,2-diarylethenes are synthesized from aryl bromides by consecutive one-pot Hiyama-Heck reactions carried out in water and under air; the only additives required are sodium hydroxide, palladium acetate and poly(ethylene glycol), and the products are isolable in many cases by simple filtration of the water solution. The Royal Society of Chemistry.
