White light from a single fluorophore : a strategy utilizing excited-state intramolecular proton-transfer phenomenon and its verification
AbstractThis article is devoted to the development of a strategy for the design of a single fluorophore emitting white light due to the excited-state intermolecular proton-transfer (ESIPT) phenomenon. The key parameters of this strategy include (i) selection of an effective blue emitter, (ii) its structural modification to enable ESIPT, and (iii) adjustment of ESIPT parameters to assess similar fluorescence intensities of both emission bands. The important factor which determines similar intensity of these bands was found to be energetic closeness of the species participating in ESIPT (Δ298G°ESIPT ≈ 0), which makes this phototransformation reversible. Verification of the proposed strategy was carried out by design and synthesis of a new ESIPT fluorophore, which exhibits white light under certain conditions. Spectral features of this compound were investigated in various liquid solutions and solid polymeric films by means of steady-state electronic absorption and steady-state, time-resolved, and temperature-dependent fluorescence spectroscopies. The conclusions on the tautomeric transformations in this compound and the origin of its spectral features are supported by quantum-chemical calculations on the density functional theory (DFT) and time-dependent DFT levels of theory. The results of investigations confirm the hypothesis that white light can be produced by a single fluorophore and evidence the applicability of the proposed strategy.
|Other language title versions|
|Journal series||The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, ISSN 1932-7447|
|Publication size in sheets||0.5|
|Score|| = 35.0, 20-12-2017, ArticleFromJournal|
= 35.0, 20-12-2017, ArticleFromJournal
|Publication indicators||: 2016 = 4.536 (2) - 2016=4.796 (5)|
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