Photophysical properties of 2-picolinoylpyrrole boron complex in solutions

Ito, Fuyuki; Nagai, Takayasu; Ono, Yuki; Yamaguchi, Kazuya; Furuta, Hiroyuki; Nagamura, Toshihiko

doi:10.1016/j.cplett.2007.01.001

Cited by 38 publications

(9 citation statements)

References 23 publications

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“…The boron complexes show little overlap between the absorption and emission spectra, with large Stokes' shifts of 2590–3450 cm –1 , larger than usually observed for fluoroboron complexes, such as BODIPYs. These large Stokes' shifts witness the push‐pull character of the dyes, with a charge‐transfer transition occurring between the peripheral substituents and the boron center 14,15…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Post‐Modification and Fluorescence Properties of Boron Diketonate Complexes

et al. 2015

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Section: Resultsmentioning

confidence: 99%

Synthesis, Post‐Modification and Fluorescence Properties of Boron Diketonate Complexes

et al. 2015

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“…The solvent and fluorophore interaction affect the energy difference between the ground and excited state. The first approximation gives this energy difference as a property of refractive index ( n ) and dielectric constant ( ε ) of the solvent which is usually explained by the Lippert–Mataga equation :

{Stoke}^{'} normals shift ((), normalΔ ν) = \frac{2 {(μ_{e} - μ_{g})}^{2}}{4 {πε}_{0} italichc α^{3}} normalΔ f ((),, ε, n) + constant

where (μ e – μ g ) is the solutes dipole moment, ε o is the the permittivity of vacuum (8.8542–10 −12 C 2 /N/m 2 ), h = 6.6262 × 10 −34 J is Planck's constant, c = 2.99 × 10 8 m/s is the velocity of light, α 3 is the solute radius (assumed spherical).…”

Section: Resultsmentioning

confidence: 99%

Assessment of spectroscopic parameters of solvated Eu(dmh)₃phen organometallic complex in various basic and acidic solvents

Chitnis

Kalyani²,

Dhoble

2018

Luminescence

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We report on the comprehension of novel europium activated hybrid organic Eu(dmh) phen (Eu: europium, dmh: 2,6-dimethyl-3,5-heptanedione, phen: 1,10 phenanthroline) organo-metallic complexes, synthesized at different pH values by the solution technique. Photo physical properties of these complexes in various basic and acidic solvents were probed by UV-vis optical absorption and photoluminescence (PL) spectra. Minute differences in optical absorption peaks with variable optical densities were encountered with the variation in solvent from basic (chloroform, toluene, tetrahydrofuran) to acidic (acetic acid) media, revealing bathochromic shift in the absorption peaks. The PL spectra of the complex in various acidic and basic organic solvents revealed the position of the emission peak at 613 nm irrespective of the changes in solvents whereas the excitation spectrum almost matched with that of the UV-vis absorption data. The optical density was found to be maximum for the complex with pH 7.0 whereas it gradually decreased when pH was lowered to 6.0 or raised to 8.0 at an interval of 0.5, demonstrating its pH sensitive nature. Several spectroscopic parameters related to probability of transition such as absorbance A(λ), Napierian absorption coefficient α(λ), molecular absorption cross-section σ(λ), radiative lifetime (τ ) and oscillator strength (f) were calculated from UV-vis spectra. The relative intensity ratio (R-ratio), calculated from the emission spectra was found to be almost the same in all the organic solvents. The optical energy gap, calculated for the designed complexes were found to be well in accordance with the ideal acceptance value of energy gap of the emissive materials used for fabrication of red organic light-emitting diode (OLED). The relation between Stoke's shift and solvent polarity function was established by Lippert-Mataga plot. This remarkable independence of the electronic absorption spectra of Eu complexes on the nature of the solvent with unique emission wavelength furnishes its potential to serve as a red light emitter for solution processed OLEDs, display panels and solid-state lighting.

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“…The interaction between the solvent and fluorophore affect the energy difference between the ground and excited state. To a first approximation this energy difference is a property of refractive index (n) and dielectric constant (Є) of the solvent which is usually explained by the Lippert-Mataga equation [16]. The sensitivity of these fluorophore to solvent polarity is due to a charge shift.…”

Section: Absorption and Fluorescence Measurementsmentioning

confidence: 99%

Synthesis and photophysical studies on 5-ethoxycarbonyl-4-cinnamyl-6-methyl- 3,4-dihydropyrimidine-2(1H)-one in various solvents

Lad¹,

Mote²,

Bhattar³

et al. 2009

Bull. Chem. Soc. Eth.

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The 5-ethoxycarbonyl-4-cinnamyl-6-methyl-3,4-dihydropyrimidine-2(1H)-one (DHPM) was synthesized via Biginelli reaction and was characterized by NMR, IR, UV-Visible absorption and fluorescence spectroscopy. The fluorescence of the compound exhibits red shift from its absorption spectra and correlated with the solvent polarity. The quantum yield of fluorescence of the DHPM was found to vary with solvent polarity. The absorption spectrum of DHPM overlaps significantly with anthracene fluorescence spectrum. Therefore fluorescence quenching experiments were performed in 1,4-dioxane. The fluorescence of anthracene was found to be quenched and quenching is in accordance with Stern-Volmer relation. The Stern-Volmer constant (KSV = 2.52 x 10 3 M-1) was obtained. The quenching rate constant (kq = 7.145 x 10 11 M-1 s-1) was calculated from the fluorescence lifetime of anthracene measured on time resolved fluorimeter (TRF) in absence of DHPM. The fluorescence quenching explained on the basis of energy transfer from anthracene to DHPM derivative. The rate constant as well as efficiency of energy transfer depends on the distance between donor and acceptor and found to be r = 6.39 nm which indicates energy transfer.

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Photophysical properties of 2-picolinoylpyrrole boron complex in solutions

Cited by 38 publications

References 23 publications

Synthesis, Post‐Modification and Fluorescence Properties of Boron Diketonate Complexes

Synthesis, Post‐Modification and Fluorescence Properties of Boron Diketonate Complexes

Assessment of spectroscopic parameters of solvated Eu(dmh)₃phen organometallic complex in various basic and acidic solvents

Synthesis and photophysical studies on 5-ethoxycarbonyl-4-cinnamyl-6-methyl- 3,4-dihydropyrimidine-2(1H)-one in various solvents

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Photophysical properties of 2-picolinoylpyrrole boron complex in solutions

Cited by 38 publications

References 23 publications

Synthesis, Post‐Modification and Fluorescence Properties of Boron Diketonate Complexes

Synthesis, Post‐Modification and Fluorescence Properties of Boron Diketonate Complexes

Assessment of spectroscopic parameters of solvated Eu(dmh)3phen organometallic complex in various basic and acidic solvents

Synthesis and photophysical studies on 5-ethoxycarbonyl-4-cinnamyl-6-methyl- 3,4-dihydropyrimidine-2(1H)-one in various solvents

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Assessment of spectroscopic parameters of solvated Eu(dmh)₃phen organometallic complex in various basic and acidic solvents