High-Energy Long-Lived Emitting Mixed Excitons in Homopolymeric Adenine-Thymine DNA Duplexes
[EN] The publication deals with polymeric pA·pT and oligomeric A(20)·T(20) DNA duplexes whose fluorescence is studied by time-correlated single photon counting. It is shown that their emission on the nanosecond timescale is largely dominated by high-energy components peaking at a wavelength shorter...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/193779 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/193779 |
| Access Level: | acceso abierto |
| Palabra clave: | DNA Intrinsic fluorescence Time-resolved fluorescence spectroscopy Excitons Hypochromism QUIMICA ORGANICA |
| Sumario: | [EN] The publication deals with polymeric pA·pT and oligomeric A(20)·T(20) DNA duplexes whose fluorescence is studied by time-correlated single photon counting. It is shown that their emission on the nanosecond timescale is largely dominated by high-energy components peaking at a wavelength shorter than 305 nm. Because of their anisotropy (0.02) and their sensitivity to base stacking, modulated by the duplex size and the ionic strength of the solution, these components are attributed to mixed pi pi*/charge transfer excitons. As high-energy long-lived excited states may be responsible for photochemical reactions, their identification via theoretical studies is an important challenge. |
|---|