Excitation dependent fluorescence of phenanthrene

Light‐Harvesting Nanotubes Formed by Supramolecular Assembly of Aromatic Oligophosphates

“…Excitation at 243 nm (H-band) leads to changes in the shape of the emission band. [57] Thef luorescence quantum yield (F) also depends significantly on the excitation wavelength. [56] Thee xcitation wavelength dependence of phenanthrene fluorescence has been reported previously and was attributed to solvation effects.…”

“…[56] Thee xcitation wavelength dependence of phenanthrene fluorescence has been reported previously and was attributed to solvation effects. [57] Thef luorescence quantum yield (F) also depends significantly on the excitation wavelength. For excitation at 316 nm, av alue of 7% was obtained (see the Supporting Information for details), whereas excitation at 243 nm (H-band) renders av alue of only 3%.Ared-shifted fluorescence and al ow quantum yield are well-known features of H-aggregates.…”

Light‐Harvesting Nanotubes Formed by Supramolecular Assembly of Aromatic Oligophosphates

“…The maxima are shifted by 5 nm to the red (376 and 396 nm) and a broad band newly appears around 425 nm, which most likely arises from excimer formation . The excitation wavelength dependence of phenanthrene fluorescence has been reported previously and was attributed to solvation effects . The fluorescence quantum yield ( Φ ) also depends significantly on the excitation wavelength.…”

Investigating the Interaction of Anthracene and Phenanthrene with Cucurbit[n]urils (n=6‐8): Experimental and Molecular Dynamics Studies

“…On the other hand, even in the case of the sorption of PHN on the silica surface, PHN does not normally exhibit excimer emission [30] where it exists mainly as a monomer [31] . The potential state of PHN inside the cavity stabilizes its steric position, which limits PHN‐PHN interaction [32] . Previous studies on phenanthrene and phenanthrene derivatives’ fluorescence behavior suggest that these new peaks at about 410 and 430 nm result from delayed fluorescence (DF) not excimer emission or phosphorescence.…”

“…It is unclear why this happened, but by taking into consideration that the intensity ratio of the bands is independent of the excitation wavelength, and the fact that redistribution of solvent molecules around the guest redistributes the fluorescence energy and changes the intensity ratio of the bands (i. e. different electronic and magnetic properties), we concluded that this behavior is due to total rearrangement of the energy distribution of fluorescence due to complexation. [32] The equilibrium is reached vastly even in less host concentration with 1 : 1 stoichiometry (Table 1). The higher non-polar nature of the inner cavity, as well as the narrower portal of CB[n], makes the environment highly comfortable for nonpolar moieties leading to highly exothermic stable complex formation.…”