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Your search keyword '"Ryan, Seán T. J."' showing total 18 results
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18 results on '"Ryan, Seán T. J."'

1. A Dynamic and Responsive Host in Action: Light‐Controlled Molecular Encapsulation

Author

Ryan, Seán T. J., Barrio, Jesús del, Suardíaz Delrío, Reynier, Ryan, Daniel F., Rosta, Edina, Scherman, Oren A., Ryan, Seán T. J., Barrio, Jesús del, Suardíaz Delrío, Reynier, Ryan, Daniel F., Rosta, Edina, and Scherman, Oren A.

Abstract

The rational design of a flexible molecular box, oAzoBox4+ , incoporating both photochromic and supramolecular recognition motifs is described. We exploit the E$Z photoisomerization properties of azobenzenes to alter the shape of the cavity of the macrocycle upon absorption of light. Imidazolium motifs are used as hydrogen-bonding donor components, allowing for sequestration of small molecule guests in acetonitrile. Upon E!Z photoisomerization of oAzoBox4+ the guest is expelled from the macrocyclic cavity, NASA Postdoctoral Program, Robert Gardiner memorial scholarship, Cambridge Home and European Scholarship Scheme, EPSRC, ERC, Walters-Kundert Foundation, EPSRC, Depto. de Química Física, Fac. de Ciencias Químicas, TRUE, pub

Published
2024

3. Correction to “Photogeneration of Spin Quintet Triplet–Triplet Excitations in DNA-Assembled Pentacene Stacks”

Author

Orsborne, Sarah R. E., primary, Gorman, Jeffrey, additional, Weiss, Leah R., additional, Sridhar, Akshay, additional, Panjwani, Naitik A., additional, Divitini, Giorgio, additional, Budden, Peter, additional, Palecek, David, additional, Ryan, Seán T. J., additional, Rao, Akshay, additional, Collepardo-Guevara, Rosana, additional, El-Sagheer, Afaf H., additional, Brown, Tom, additional, Behrends, Jan, additional, Friend, Richard H., additional, and Auras, Florian, additional

Published
2023
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4. Photogeneration of Spin Quintet Triplet–Triplet Excitations in DNA-Assembled Pentacene Stacks

Author

Orsborne, Sarah R. E., primary, Gorman, Jeffrey, additional, Weiss, Leah R., additional, Sridhar, Akshay, additional, Panjwani, Naitik A., additional, Divitini, Giorgio, additional, Budden, Peter, additional, Palecek, David, additional, Ryan, Seán T. J., additional, Rao, Akshay, additional, Collepardo-Guevara, Rosana, additional, El-Sagheer, Afaf H., additional, Brown, Tom, additional, Behrends, Jan, additional, Friend, Richard H., additional, and Auras, Florian, additional

Published
2023
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Author

Gorman, Jeffrey, Orsborne, Sarah R. E., Sridhar, Akshay, Pandya, Raj, Budden, Peter, Ohmann, Alexander, Panjwani, Naitik A., Liu, Yun, Greenfield, Jake L., Dowland, Simon, Gray, Victor, Ryan, Seán T. J., De Ornellas, Sara, El-Sagheer, Afaf H., Brown, Tom, Nitschke, Jonathan R., Behrends, Jan, Keyser, Ulrich F., Rao, Akshay, Collepardo-Guevara, Rosana, Stulz, Eugen, Friend, Richard H., Auras, Florian, Gorman, Jeffrey, Orsborne, Sarah R. E., Sridhar, Akshay, Pandya, Raj, Budden, Peter, Ohmann, Alexander, Panjwani, Naitik A., Liu, Yun, Greenfield, Jake L., Dowland, Simon, Gray, Victor, Ryan, Seán T. J., De Ornellas, Sara, El-Sagheer, Afaf H., Brown, Tom, Nitschke, Jonathan R., Behrends, Jan, Keyser, Ulrich F., Rao, Akshay, Collepardo-Guevara, Rosana, Stulz, Eugen, Friend, Richard H., and Auras, Florian

Abstract

Natural photosystems use protein scaffolds to control intermolecular interactions that enable exciton flow, charge generation, and long-range charge separation. In contrast, there is limited structural control in current organic electronic devices such as OLEDs and solar cells. We report here the DNA-encoded assembly of pi-conjugated perylene diimides (PDIs) with deterministic control over the number of electronically coupled molecules. The PDIs are integrated within DNA chains using phosphoramidite coupling chemistry, allowing selection of the DNA sequence to either side, and specification of intermolecular DNA hybridization. In this way, we have developed a "toolbox" for construction of any stacking sequence of these semiconducting molecules. We have discovered that we need to use a full hierarchy of interactions: DNA guides the semiconductors into specified close proximity, hydrophobic-hydrophilic differentiation drives aggregation of the semiconductor moieties, and local geometry and electrostatic interactions define intermolecular positioning. As a result, the PDIs pack to give substantial intermolecular pi wave function overlap, leading to an evolution of singlet excited states from localized excitons in the PDI monomer to excimers with wave functions delocalized over all five PDIs in the pentamer. This is accompanied by a change in the dominant triplet forming mechanism from localized spin-orbit charge transfer mediated intersystem crossing for the monomer toward a delocalized excimer process for the pentamer. Our modular DNA-based assembly reveals real opportunities for the rapid development of bespoke semiconductor architectures with molecule-by-molecule precision., Title in Web of Science: Deoxyribonucleic Acid Encoded and Size-Defined pi-Stacking of Perylene Diimides

Published
2022
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7. An S-shaped double helicene showing both multi-resonance thermally activated delayed fluorescence and circularly polarized luminescence

Author

dos Santos, John Marques, primary, Sun, Dianming, additional, Moreno-Naranjo, Juan Manuel, additional, Hall, David, additional, Zinna, Francesco, additional, Ryan, Seán T. J., additional, Shi, Wenda, additional, Matulaitis, Tomas, additional, Cordes, David B., additional, Slawin, Alexandra M. Z., additional, Beljonne, David, additional, Warriner, Stuart L., additional, Olivier, Yoann, additional, Fuchter, Matthew J., additional, and Zysman-Colman, Eli, additional

Published
2022
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8. Deoxyribonucleic Acid Encoded and Size-Defined π-Stacking of Perylene Diimides

Author

Gorman, Jeffrey, primary, Orsborne, Sarah R. E., additional, Sridhar, Akshay, additional, Pandya, Raj, additional, Budden, Peter, additional, Ohmann, Alexander, additional, Panjwani, Naitik A., additional, Liu, Yun, additional, Greenfield, Jake L., additional, Dowland, Simon, additional, Gray, Victor, additional, Ryan, Seán T. J., additional, De Ornellas, Sara, additional, El-Sagheer, Afaf H., additional, Brown, Tom, additional, Nitschke, Jonathan R., additional, Behrends, Jan, additional, Keyser, Ulrich F., additional, Rao, Akshay, additional, Collepardo-Guevara, Rosana, additional, Stulz, Eugen, additional, Friend, Richard H., additional, and Auras, Florian, additional

Published
2021
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9. Deoxyribonucleic Acid Encoded and Size-Defined π-Stacking of Perylene Diimides

Author

Gorman, Jeffrey, Orsborne, Sarah R. E., Sridhar, Akshay, Pandya, Raj, Budden, Peter, Ohmann, Alexander, Panjwani, Naitik A., Liu, Yun, Greenfield, Jake L., Dowland, Simon, Gray, Victor, Ryan, Seán T. J., De Ornellas, Sara, El-Sagheer, Afaf H., Brown, Tom, Nitschke, Jonathan R., Behrends, Jan, Keyser, Ulrich F., Rao, Akshay, Collepardo-Guevara, Rosana, Stulz, Eugen, Friend, Richard H., and Auras, Florian

Abstract

Natural photosystems use protein scaffolds to control intermolecular interactions that enable exciton flow, charge generation, and long-range charge separation. In contrast, there is limited structural control in current organic electronic devices such as OLEDs and solar cells. We report here the DNA-encoded assembly of π-conjugated perylene diimides (PDIs) with deterministic control over the number of electronically coupled molecules. The PDIs are integrated within DNA chains using phosphoramidite coupling chemistry, allowing selection of the DNA sequence to either side, and specification of intermolecular DNA hybridization. In this way, we have developed a “toolbox” for construction of any stacking sequence of these semiconducting molecules. We have discovered that we need to use a full hierarchy of interactions: DNA guides the semiconductors into specified close proximity, hydrophobic–hydrophilic differentiation drives aggregation of the semiconductor moieties, and local geometry and electrostatic interactions define intermolecular positioning. As a result, the PDIs pack to give substantial intermolecular π wave function overlap, leading to an evolution of singlet excited states from localized excitons in the PDI monomer to excimers with wave functions delocalized over all five PDIs in the pentamer. This is accompanied by a change in the dominant triplet forming mechanism from localized spin–orbit charge transfer mediated intersystem crossing for the monomer toward a delocalized excimer process for the pentamer. Our modular DNA-based assembly reveals real opportunities for the rapid development of bespoke semiconductor architectures with molecule-by-molecule precision.

Published
2022
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14. Energy and Electron Transfer Dynamics within a Series of Perylene Diimide/Cyclophane Systems

Author

Ryan, Seán T. J., primary, Young, Ryan M., additional, Henkelis, James J., additional, Hafezi, Nema, additional, Vermeulen, Nicolaas A., additional, Hennig, Andreas, additional, Dale, Edward J., additional, Wu, Yilei, additional, Krzyaniak, Matthew D., additional, Fox, Athan, additional, Nau, Werner M., additional, Wasielewski, Michael R., additional, Stoddart, J. Fraser, additional, and Scherman, Oren A., additional

Published
2015
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15. Light activated molecular machines and logic gates: general discussion

Author

Bassani, Dario M., primary, Cucinotta, Fabio, additional, Bohne, Cornelia, additional, Basílio, Nuno, additional, Lemon, Christopher, additional, Allain, Clémence, additional, Sundstrom, Villy, additional, Campagna, Sebastiano, additional, Rohacova, Jana, additional, Ketteler, Yvonne, additional, Ryan, Seán T. J., additional, Vos, Johannes, additional, de Silva, Amilra Prasanna, additional, and Slota, Michael, additional

Published
2015
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17. Light-Regulated Molecular Trafficking in a Synthetic Water-Soluble Host.

Author

Barrio, Jesús del, Ryan, Seán T. J., Jambrina, Pablo G., Rosta, Edina, and Scherman, Oren A.

Subjects
*CUCURBITURIL, *COMPLEXATION reactions, *AZOBENZENE, *ENCAPSULATION (Catalysis), *MACROCYCLIC compounds
Abstract

Cucurbit[8]uril (CB[8])-mediated complexation of a dicationic azobenzene in water allows for the light-controlled encapsulation of a variety of second guest compounds, including amino acids, dyes, and fragrance molecules. Such controlled guest sequestration inside the cavity of CB[8] enables the regulation of the thermally induced phase transition of poly(N-isopropylacrylamide)--which is not photosensitive--thus demonstrating the robustness and relevancy of the light-regulated CB[8] complexation. [ABSTRACT FROM AUTHOR]

Published
2016
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