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Singlet excited-state interactions in naphthalene-thymine dyads
Susana Encinas1, Maria J Climent, Salvador Gil
1Instituto de Tecnología Química UPV-CSlC/Departamento de Química, Universidad Politécnica de Valencia, Avda de los Naranjos s/n, 46022 Valencia, Spain.
Summary
Researchers synthesized two nucleoside dyads with unique spatial arrangements. Dyad 1 demonstrated significant intramolecular fluorescence quenching in the presence of hydrogen-bond donors, indicating a novel deactivation pathway.
Area of Science:
- Organic Chemistry
- Photochemistry
- Supramolecular Chemistry
Background:
- Nucleoside analogs are crucial in medicinal chemistry and molecular biology.
- Understanding photophysical properties of nucleoside derivatives is key to developing new functional molecules.
Purpose of the Study:
- To synthesize novel thymidine-derived nucleoside dyads.
- To investigate the photophysical properties and intramolecular interactions of these dyads.
Main Methods:
- Synthesis of two thymidine-derived nucleoside dyads (1 and 2) incorporating a chiral naphthalene moiety.
- Emission spectroscopy to study the photophysical behavior of the dyads.
- Analysis of the influence of hydrogen-bond donor solvents (ROH) on fluorescence quenching.
Main Results:
- Dyads 1 and 2 exhibited distinct spatial arrangements (transoid/cisoid) of the naphthalene fluorophore relative to the thymine base.
- Dyad 1 showed significant intramolecular fluorescence quenching in the presence of ROH molecules.
- The quenching mechanism was attributed to vibronically induced internal conversion, a physical deactivation process.
Conclusions:
- The spatial arrangement of the naphthalene and thymine units critically influences photophysical properties.
- Hydrogen-bonding interactions with solvents can trigger efficient intramolecular quenching pathways.
- These findings offer insights into designing nucleoside-based systems with controlled photophysical responses.