Reversible photo-regulation of a hammerhead ribozyme using a diffusible effector.
- Hyun-Wu Lee, S. G. Robinson, S. Bandyopadhyay, R. H. Mitchell, D. Sen
- Biology, ChemistryJournal of Molecular Biology
- 31 August 2007
Oligothiophene functionalized dimethyldihydropyrenes II: electrochemical and conductive properties.
- S. G. Robinson, M. Lonergan, R. H. Mitchell
- ChemistryJournal of Organic Chemistry
- 30 July 2009
Three different types of oligothiophene functionalized dihydropyrene photoswitches, including type A, showed the greatest effect in controlling electrical conductivity and solution cyclic voltammetry for the closed isomers indicated that the first few oxidation peaks were quasi-reversible, but that later ones were irreversible, leading to polymerization.
Oligothiophene functionalized dimethyldihydropyrenes I: syntheses and photochromicity.
- S. G. Robinson, V. Sauro, R. H. Mitchell
- ChemistryJournal of Organic Chemistry
- 30 July 2009
A comparison of the relative opening rates to that of the benzo[e]pyrene 4 is made, and all of the above photochromes show considerably enhanced photo-opening of the DHPs to the CPDs, probably the best compromise between fast photochromicity and slow thermal reversion.
Suppressing the thermal metacyclophanediene to dihydropyrene isomerization: synthesis and rearrangement of 8,16-dicyano[2.2]metacyclophane-1,9-diene and evidence supporting the proposed biradicaloid…
- K. Ayub, Rui Zhang, S. G. Robinson, B. Twamley, R. V. Williams, R. H. Mitchell
- ChemistryJournal of Organic Chemistry
- 18 January 2008
Dinitrile 1b shows no tendency to convert thermally to 2b at room temperature (tau 1/2 > 30 years), consistent with predictions based on calculation of activation barriers.
A DFT study of the thermal, orbital symmetry forbidden, cyclophanediene to dihydropyrene electrocyclic reaction. Predictions to improve the dimethyldihydropyrene photoswitches.
- R. V. Williams, W. Edwards, R. H. Mitchell, S. G. Robinson
- ChemistryJournal of the American Chemical Society
- 28 October 2005
The orbital symmetry forbidden thermal electrocyclic equilibria between a series of cyclophanedienes and dimethyldihydropyrenes (CPD<==>DDPs) were studied using density functional theory and specific substitution by nitrile or trifluoromethyl group(s) is predicted to strongly affect the magnitude of the activation barriers for these reactions.
The effect of addition of fluorescent moieties to dihydropyrenes: enhancing photochromicity and fluorescence monitoring.
- R. H. Mitchell, C. Bohne, S. G. Robinson, Yanhong Yang
- ChemistryJournal of Organic Chemistry
- 19 September 2007
The fluorescence of the appending naphthoyl or pyrenoyl moieties was not suitable to follow the photochromic cycling of the dihydropyrenes, but the emission detected above 600 nm of the closed isomer of thedihydropyrene moiety was shown to be a good monitoring method for the photo chromic cycling.
Polyelectrolyte-Mediated Electrochemical Fabrication of a Polyacetylene p−n Junction
- S. G. Robinson, D. Johnston, Christopher D. Weber, M. Lonergan
- Materials Science, Chemistry
- 12 January 2010
The diffusion of dopant counterions has made the formation of conjugated polymer p−n junctions challenging. We demonstrate polyelectrolyte mediated electrochemistry (PMEC) as a three-electrode…
Stable ion NMR and GIAO-DFT study of novel cations from 8,16-dicyano[2.2]metacyclophanedienes and from strategically substituted/benzannelated dihydropyrenes: charge-induced tropicity modulation and…
- K. Laali, T. Okazaki, R. H. Mitchell, K. Ayub, Rui Zhang, S. G. Robinson
- ChemistryJournal of Organic Chemistry
- 18 January 2008
Facile formation of 2 from 1 in quenching experiments indicates that thermal closing can be achieved with the diprotonated dinitrile, without imposing skeletal rearrangement.
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