Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 7, Issue 5, Pages 1661-1669Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ee43293a
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Funding
- Science and Engineering Research Board [SERB/F/0962]
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We report the synthesis and excited state properties of a single component light harvesting donor-acceptor dyad (R/S)-NP(OH)(2) containing an alpha,beta-dihydroxypropyl side-chain that can undergo molecule-bilayer-vesicle-gel-crystal transition. By virtue of steric hindrance offered by orthogonal naphthalimide and 2,6-diisopropylphenyl substituents, very weak H-type excitonic interactions between the perylenimide units resulted in high fluorescence quantum yield in the dyad-based metastable vesicular gel having a near-quantitative excitation energy transfer from naphthalimide to perylenimide. Femtosecond transient absorption measurements of the dyad (R/S)-NP(OH)(2) : indole co-gel show that the vesicular scaffold promoted extension of the survival time of charge separated states (similar to 1.4 ns) when compared to ultrafast charge recombination (similar to 6 ps) in dyad (R/S)-NP(OH)(2) : indole solution.
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