Dominic V Mcgrath
Publications
Abstract:
The polarity of the open form of spiropyrans is suitable for use as surfactants and for controlling the hydrophilicity of the dendrimer surface with the use of light. Spiropyrans as a peripheral unit of dendrimer with a non-polar inner core will lead to the formation of macromolecules with photolytically-controlled amphiphilic character. In this connection, spiropyran subunits were introduced on the surface of dendrimers prepared using the convergent synthetic strategy to modify the dendrimers' properties.
Abstract:
Thermally labile dendronized AA-BB step polymers are described. First through third generation dendritic bisfuran monomers 6a-6c were prepared in part by the Cu(I)-catalyzed azide-alkyne Huisgen 1,3-dipolar cycloaddition reaction and in turn polymerized by the reversible furan-maleimide Diels-Alder reaction, The Diels-Alder reaction conditions were optimized through end-capping studies with N-phenylmaleimide (7). Dendronized step polymers 10a-10c were then formed from reaction with bismaleimide 9 and their assembly, disassembly, and reassembly behavior studied by GPC. © 2009 American Chemical Society.
Abstract:
An approach to dendrimers with highly functional interiors constructed from chiral, non-racemic hydrobenzoin monomer units is presented. An optically pure monomer unit is prepared using asymmetric dihydroxylation (AD) and a representative dendrimer is constructed by a convergent growth strategy.
The first incorporation of quinacridone, a technologically important organic electroluminescent emitter, into dendrimers increases solubility, decreases aggregation, retards heterogeneous electron transfer, and enhances luminescence in condensed phases (powders and thin films).
Abstract:
Metal phthalocyanines (Fe, Co, Ni and Sn) and ruthenium tetramethylcyclam 14 and 15 were studied as cocatalysts for methanol oxidation on platinum supported catalysts. The formation of well defined monolayers of the adsorbed complexes was inferred from the Langmuirian form of the adsorption isotherms in solutions of macrocycles. The coverage at monolayer levels was low, e.g. 1.25 to 2.25 × 1013 molecules cm-2 or 400 to 800 Å2 molecule-1. Enhancement for the methanol oxidation reaction was observed for Pt co-catalyzed with Sn phthalocyanine and Ru tetramethylcyclam. Ru tetramethylcyclam showed an enhancement for methanol oxidation on a per unit weight basis over pure Pt, approaching the activity of PtRu at lower potentials. Increasing the size of the nitrogen ring from 14 to 15 resulted in a lower redox potential and increase in the activity of methanol oxidation. The activity of Pt co-catalyzed with Ru TMC 15 decreased with time suggesting that the macrocycle was desorbing from the supported catalyst surface. © 1998 Elsevier Science Ltd. All rights reserved.
Pagination
- First page
- …
- 9
- 10
- 11
- …
- Last page