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• W3121491143 endingPage "2036" @default.
• W3121491143 startingPage "2025" @default.
• W3121491143 abstract "Excited anthracene is well-known to photodimerize and not to exhibit excimer emission in isotropic organic solvents. Anthracene (AN) forms two types of supramolecular host–guest complexes (2:1 and 2:2, H:G) with the synthetic host octa acid in aqueous medium. Excitation of the 2:2 complex results in intense excimer emission, as reported previously, while the 2:1 complex, as expected, yields only monomer emission. This study includes confirming of host–guest complexation by NMR, probing the host–guest structure by molecular dynamics simulation, following the dynamics AN molecules in the excited state by ultrafast time-resolved experiments, and mapping of the excited surface through quantum chemical calculations (QM/MM-TDDFT method). Importantly, time-resolved emission experiments revealed the excimer emission maximum to be time dependent. This observation is unique and is not in line with the textbook examples of time-independent monomer–excimer emission maxima of aromatics in solution. The presence of at least one intermediate between the monomer and the excimer is inferred from time-resolved area normalized emission spectra. Potential energy curves calculated for the ground and excited states of two adjacent anthracene molecules via the QM/MM-TDDFT method support the model proposed on the basis of time-resolved experiments. The results presented here on the excited-state behavior of a well-investigated aromatic molecule, namely the parent anthracene, establish that the behavior of a molecule drastically changes under confinement. The results presented here have implications on the behavior of molecules in biological systems." @default.
• W3121491143 created "2021-02-01" @default.
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• W3121491143 date "2021-01-20" @default.
• W3121491143 modified "2023-10-18" @default.
• W3121491143 title "Dynamics of Anthracene Excimer Formation within a Water-Soluble Nanocavity at Room Temperature" @default.
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• W3121491143 doi "https://doi.org/10.1021/jacs.0c12169" @default.
• W3121491143 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33471537" @default.
• W3121491143 hasPublicationYear "2021" @default.
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