Distance Matters: Effect of the Spacer Length on the Photophysical Properties of Multimodular Perylenediimide–Silicon Phthalocyanine–Fullerene Triads
| Autor: | Ángela Sastre-Santos, Francis D'Souza, Sairaman Seetharaman, Luis Martín-Gomis, Paul A. Karr, Rocío Díaz‐Puertas, Fernando Fernández-Lázaro |
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| Rok vydání: | 2020 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification Fullerene 010405 organic chemistry Organic Chemistry Triad (anatomy) Electron donor General Chemistry Electronic structure Electron acceptor 010402 general chemistry Photochemistry 01 natural sciences Fluorescence Catalysis nervous system diseases 0104 chemical sciences body regions chemistry.chemical_compound medicine.anatomical_structure chemistry Intramolecular force medicine Absorption (electromagnetic radiation) |
| Zdroj: | Chemistry – A European Journal. 26:4822-4832 |
| ISSN: | 1521-3765 0947-6539 |
| Popis: | A multimodular donor-acceptor conjugate featuring silicon phthalocyanine (SiPc) as the electron donor, and two electron acceptors, namely tetrachloroperylenediimide (PDI) and C60 , placed at the opposite ends of the SiPc axial positions, was newly designed and synthesized, and the results were compared to the earlier reported PDI-SiPc-C60 triad. Minimal intramolecular interactions between the entities was observed. Absorption, fluorescence, computational and electrochemical studies were performed to evaluate the excitation energy, geometry and electronic structure, and energy levels of different photoevents. Steady-state absorption, fluorescence and excitation spectral studies revealed efficient singlet-singlet energy transfer from 1 PDI* to SiPc in the PDI-SiPc dyad and the PDI-SiPc-C60 triad. The measured rates for these photochemical events were found to be much higher than those reported earlier for the triad, due to closer proximity between the PDI and SiPc entities. The distance also affected the charge separation path in which involvement of PDI, and not C60 , in charge separation in the present triad was witnessed. The present investigation brings out the importance of donor-acceptor distances in channeling photochemical events in a multimodular system. |
| Databáze: | OpenAIRE |
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