The charge transfer state of excited bianthryl and a derivative: solvatochromism, emission CT spectra broadening in homogeneous solvents

Laguitton-Pasquier, Hélène; Pansu, Robert; Chauvet, Jean-Paul; Collet, A.; Fauré, J.; Lapouyade, R.

doi:10.1016/s0301-0104(96)00139-5

Cited by 28 publications

(37 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For comparison, the oscillator strength for ethanol solutions of anthracene was 0.096; for DCA, 0.142; for DBA, 0.148 (ε max taken from [8], see Table 1). Our result for anthracene (0.096) agreed well with f = 0.101 that was reported earlier [15].…”

supporting

confidence: 92%

Absorptivity and fluorescence properties of 9,10-diiodoanthracene in solutions

et al. 2008

View full text Add to dashboard Cite

The molar extinction coefficient, oscillator strength, natural fluorescence lifetime, and fluorescence quantum yield have been determined for 9,10-diiodoanthracene in ethanol at 20 o C. The temperature effect on the quantum yield was studied in the range 120-300 K. The fluorescence lifetime was measured at 77 K. During glassification of ethanol, the fluorescence intensity of 9,10-diiodoanthracene increases by more than 50 times due to the activation nature of the intersystem crossing from the S 1 ( 1 B 2u + ) state. The activation energy and pre-exponential factor for the probability of the intersystem S 1 ( 1 B 2u + ) L T n ( 3 B 3u + )-crossing are found. The long-wavelength shift of the absorption spectrum with increasing bulk polarizability of the solvent is interpreted as evidence of changes in the nonspecific interactions.Introduction. 9,10-Diiodoanthracene (DIA) is one of the least studied halogenated anthracenes. Its synthesis and certain spectral-luminescence properties of its solutions have been reported [1][2][3]. The influence of temperature on absorption spectra in glassified solvents (alcohols) has been investigated [4]. Combination scattering, absorption, and fluorescence spectra of crystals under hydrostatic pressure have been published [5]. Its tendency to undergo photodecomposition, which is especially strong in solvents such as hexane and CCl4, and its low solubility in alcohols create definite experimental difficulties. This probably explains the few publications dedicated to the optical properties of DIA. The basic spectral-luminescence properties of anthracene and its halogenated derivatives are well known and have been reviewed [6,7] and included in handbooks [8]. The goal of our work was to expand the list of anthracenes in tables by adding DIA to them. The investigations are timely because DIA can be used as an effective synthesizer of singlet oxygen. DIA also provides an example of a compound with a clearly evident internal heavy-atom effect. The positions of the absorption and fluorescence bands, the molar extinction coefficient, the fluorescence quantum yield at room temperature, and the fluorescence lifetime at 77 K were obtained directly from measurements and by processing the data. The natural fluorescence lifetime, oscillator strength, and activation energy and pre-exponential factor that characterize intersystem crossing from the S 1 -state were calculated using formulas described in known models.Experimental. Absorption spectra were measured on a Cary 500 spectrophotometer; fluorescence spectra, on a SOLAR SFL-1211A spectrofluorimeter (Minsk). Solutions were not degassed. The quantum yield was determined by a relative method. The standard was a solution of 3,6-diamino-N-methylphthalimide (sublimed) in ethanol with a yield of 0.46 [9]. A custom cryostat stabilized the temperature to within ±1 K as measured by a nichrome-copper thermocouple accurate to ±0.5 K. The fluorescence decay kinetics were measured by correlated photon counting using a TCC900 computer module (Edinburgh Instr...

show abstract

supporting

confidence: 92%

Absorptivity and fluorescence properties of 9,10-diiodoanthracene in solutions

et al. 2008

View full text Add to dashboard Cite

show abstract

“…As the polarity is increased when moving from chlorinated solvents to MeCN, the increasing relative intensity of this second peak and its further bathochromic shi are indicative of emission from a CT state. [35][36][37] The emission spectra are normalized relative to the peak of the LE (which has reduced intensity in polar solvents) in order to better demonstrate the solvatochromic shi. The intensities of the spectra alone do not illustrate the absolute populations of the states, but the changes in intensity can be rationalized.…”

Section: Resultsmentioning

confidence: 99%

Modulation of charge transfer by N-alkylation to control photoluminescence energy and quantum yield

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The photon source was a Spectra-Physics set-up, composed of a Titanium-Sapphire Tsunami laser pumped by an argon ion laser, which led to a 37 ps fwhm instrument response. Further description may be found elsewhere (29). Data analysis was performed by a deconvolution method using a nonlinear least-squares fitting program based on the Marquardt algorithm.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Water on the Photophysical and Photochemical Properties of Piroxicam in AOT/iso-octane/Water Reversed Micelles

Andrade¹,

Costa²,

Pansu³

2000

Photochem Photobiol

View full text Add to dashboard Cite

The photophysical properties of Piroxicam, a nonsteroidal anti-inflammatory drug (NSAID), were investigated at different pHext values in reversed micelles of Aerosol-OT (AOT) in iso-octane, using both steady-state and picosecond time-resolved fluorescence spectroscopy. In contrast with the very complex data obtained in aqueous media, where several prototropic species are in equilibrium, the reversed micellar system essentially favors two species. The absorption spectra shows only one isosbestic point at lambda = 348 nm. Excited-state intramolecular proton transfer (ESIPT), also detected in water, is promoted at low water pool contents measured by omega 0 = [H2O]/[AOT]. A strongly shifted (lambda em = 470 nm) tautomeric emission is found. Upon the gradual increase of omega 0, striking differences with pHext are found. At pHext = 4, the drug preferentially locates itself in the interfacial region partitioning between a hydrophobic and a hydrophilic domain. Global analysis was applied to the decay data and the results were interpreted by the "two-state excited-state" formalism. At pHext = 7, the anionic species is prevalent and the probe locates itself deeper inside the water core of the reversed micelles. Thus, a strong dependence on water content is detected, approaching a behavior similar to that observed in free aqueous solutions.

show abstract

The charge transfer state of excited bianthryl and a derivative: solvatochromism, emission CT spectra broadening in homogeneous solvents

Cited by 28 publications

References 36 publications

Absorptivity and fluorescence properties of 9,10-diiodoanthracene in solutions

Absorptivity and fluorescence properties of 9,10-diiodoanthracene in solutions

Modulation of charge transfer by N-alkylation to control photoluminescence energy and quantum yield

The Influence of Water on the Photophysical and Photochemical Properties of Piroxicam in AOT/iso-octane/Water Reversed Micelles

Contact Info

Product

Resources

About