New luminophores having different aryl nuclei and propynones moieties have been obtained via sonogashira reactions. Their optical properties were evaluated and indicated that carbonylgroups are responsible for significant bathochromic effects and high stokes shifts. The insertion of -ome groups on the central benzene unit gives to the fluorophore high optical efficiency when homogeneously dispersed
Signatures of Quantum Interference Effects on Charge Transport Through a Single Benzene Ring
作者:Carlos R. Arroyo、Simge Tarkuc、Riccardo Frisenda、Johannes S. Seldenthuis、Charlotte H. M. Woerde、Rienk Eelkema、Ferdinand C. Grozema、Herre S. J. van der Zant
DOI:10.1002/anie.201207667
日期:2013.3.11
Molecular electronics: Chargetransportthrough a singlebenzenering is studied using the mechanically controlled break‐junction technique. The low‐bias conductance for a meta‐coupled benzenering is more than an order of magnitude smaller than that of a para‐coupled benzenering. This difference can be explained by a destructive quantuminterferenceeffects in the meta‐coupled benzene (see picture).
Sonogashira Couplings Catalyzed by Collaborative (<i>N</i>-Heterocyclic Carbene)-Copper and -Palladium Complexes
作者:Christopher W. D. Gallop、Ming-Tsz Chen、Oscar Navarro
DOI:10.1021/ol501540w
日期:2014.7.18
A general protocol for the Sonogashira reaction using a 100:1 combination of (N-heterocyclic carbene)-Cu and (N-heterocyclic carbene)-Pd complexes is presented. Catalyst loadings of 1 mol % (NHC)-Cu and 0.01 mol % (NHC)-Pd allow for the coupling of aryl bromides and aryl alkynes, in air and in a non-anhydrous solvent, in high yields.