Science (American Association for the Advancement of Science), 1998-09, Vol.281 (5383), p.1653-1656
1998
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Details
- Autor(en) / Beteiligte
- Titel
- Design of Organic Molecules with Large Two-Photon Absorption Cross Sections
- Ist Teil von
- Science (American Association for the Advancement of Science), 1998-09, Vol.281 (5383), p.1653-1656
- Ort / Verlag
- Washington, DC: American Society for the Advancement of Science
- Erscheinungsjahr
- 1998
- Quelle
- American Association for the Advancement of Science
- Beschreibungen/Notizen
- A strategy for the design of molecules with large two-photon absorption cross sections, δ, was developed, on the basis of the concept that symmetric charge transfer, from the ends of a conjugated system to the middle, or vice versa, upon excitation is correlated to enhanced values of δ. Synthesized bis(styryl)benzene derivatives with donor-π-donor, donor-acceptor-donor, and acceptor-donor-acceptor structural motifs exhibit exceptionally large values of δ, up to about 400 times that of trans-stilbene. Quantum chemical calculations performed on these molecules indicate that substantial symmetric charge redistribution occurs upon excitation and provide δ values in good agreement with experimental values. The combination of large δ and high fluorescence quantum yield or triplet yield exhibited by molecules developed here offers potential for unprecedented brightness in two-photon fluorescent imaging or enhanced photosensitivity in two-photon sensitization, respectively.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0036-8075eISSN: 1095-9203DOI: 10.1126/science.281.5383.1653Titel-ID: cdi_proquest_miscellaneous_743177329
- Format
- –
- Schlagworte
- Absorption cross sections, Aniline Compounds - chemistry, Atomic and molecular physics, Biochemistry, Biomolecules, Charge transfer, Chemical Phenomena, Chemistry, Physical, Design and construction, Donors, Exact sciences and technology, Fluorescence, Lasers, Molecular excitation, Molecular properties and interactions with photons, Molecules, Multiphoton ionization and excitation to highly excited states (e.g., rydberg states), Multiphoton ionization and excitation to highly excited states (eg, Rydberg states), Optics, Organic Chemistry, Photoabsorption, Photochemistry, Photon interactions with molecules, Photons, Physics, Quadrupoles, Quantum theory, Stilbenes - chemical synthesis, Stilbenes - chemistry, Technology, Wavelengths