Solvatochromism and prototropism in 6-aminonicotinic acid

Dogra, Sneh K.

doi:10.1016/j.jlumin.2005.01.004

Cited by 3 publications

(2 citation statements)

References 53 publications

(69 reference statements)

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“…However, the fluorescence quantum yields are quite far from the values usually observed to ESIPT dyes. [44][45][46][47][48] Additionally, although the emission maxima shift with the solvent, it could not be observed a tendency concerning the increase of the solvent polarity/emission maxima location. Such a solvatochromic effect in the emission maxima of 3 can be associated with changes in the excited state charge's distribution as compared to that in the ground state.…”

Section: Photophysical Characterizationmentioning

confidence: 99%

“…Therefore, emission bands practically are unaffected by the solvents (typical for p-p* transitions). It is worth mentioning that although the fluorescence emission is less affected by the solvent polarity, since the ICT state no longer takes place in the excited state, the Stokes' shift remains higher and could even be related to an ESIPT mechanism; 41,42 however, one more time the high values for the fluorescence quantum yields clearly indicate that the emission is probably related to a locally excited state in spite of the lower values expected for the ESIPT tautomer, [44][45][46][47] although the mechanism of the energy loss in the excited state still remains unknown. The full width at half the maximum height (fwhm) of the fluorescence band of dye 5 is practically invariant in all studied solvents suggesting that not much change is occurring in the geometry of the molecule on excitation to the excited state.…”

Section: Photophysical Characterizationmentioning

confidence: 99%

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Bis-silylated terephthalate as a building block precursor for highly fluorescent organic–inorganic hybrid materials

et al. 2012

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A bis-silylated diethyl 2,5-bis [N,N-(3-triethoxysilyl)propylurea]terephthalate precursor (5) was synthesized from a terephthalate derivative (3) and successfully used to prepare highly fluorescent organosilicas by hydrolytic self-condensation (DPM1) and co-condensation (DPM2) with tetraethoxysilane. The dyes 3 and 5 present absorption in the UV-Vis region and fluorescence emission in the yellow and blue regions, respectively. The red-shifted bands in the absorption spectra of dye 3 with respect to dye 5 can be related to the formation of intramolecular charge transfer (ICT) state even in the ground-state due to the strong electron-donor amino groups and moderate electron-withdrawing carbonyl groups present in the benzenic ring. The small Stokes' shift, as well as the high fluorescence quantum yield values discards the intramolecular proton transfer mechanism in the excited state. The fluorescence emission dependence on the solvent polarity indicates that an intramolecular charge transfer (ICT) or a locally excited (LE) state is taking place in the excited state to the dyes 3 and 5, respectively. The new fluorescent hybrid materials (DPM1 and DPM2) show absorption maxima in the solid state located at around 390 nm, indicating that the electronic structure of the fluorescent precursor was not significantly perturbed in the ground state after its self-condensation or co-condensation with TEOS. The fluorescent material DPM2 presents a photophysical behavior quite similar to the precursor in solution. On the other hand, the self-condensed material DPM1 presents a fluorescence emission maximum red-shifted by 33 nm, which can be probably attributed to p-p stacking between the terephthalate cores. Any evidence of auto-organization could be observed in these materials.

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Section: Photophysical Characterizationmentioning

confidence: 99%