Study on micelle stabilized room temperature phosphorescence behaviour of pyrene by laser induced time resolved technique

Wei, Yansheng; Weijun, Jin; Liu, Changsong; Zhou, Hang; Tong, Hongbo; Naichang, Zhang

doi:10.1016/s0584-8539(97)00043-3

Cited by 14 publications

(5 citation statements)

References 9 publications

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“…The excitation spectrum for the emission at 595 nm is very broad; there are two main peaks at 390 and 335 nm, and the profile extends into the visible region. The emission spectrum for 1 is consistent with pyrene phosphorescence and has been described previously, most commonly for solution-state studies that have examined host–guest properties. − The luminescence decay spectrum for emission at 595 nm fit well with a biexponential decay function, indicating the presence of two distinct lifetimes of 465.5 and 128.9 μs (Figure S13). The shorter lifetime is attributed to direct singlet excitation of the pyrene molecule, followed by intersystem crossing and emission from the pyrene triplet state.…”

Section: Resultssupporting

confidence: 83%

“…Compounds 1 – 3 all display photoluminescence at room temperature in the solid state. Both 1 and 2 display phosphorescence characteristic of the outer coordination sphere arene molecules. − ,, Importantly, these compounds display strong π–π stacking interactions yet contain no hydrogen-bonding interactions with the outer coordination arene molecule. In a previous study, we reported a similar bismuth–organic dimer with an outer coordination N-heterocycle, Hphen; the compound exhibited characteristic Hphen phosphorescence at room temperature in the solid state .…”

Section: Discussionmentioning

confidence: 99%

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Unlocking Arene Phosphorescence in Bismuth–Organic Materials

Marwitz,

Dutta,

Conner

et al. 2024

Inorg. Chem.

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Three novel bismuth–organic compounds, with the general formula [Bi2(HPDC)2(PDC)2]·(arene)·2H2O (H2PDC = 2,6-pyridinedicarboxylic acid; arene = pyrene, naphthalene, and azulene), that consist of neutral dinuclear Bi-pyridinedicarboxylate complexes and outer coordination sphere arene molecules were synthesized and structurally characterized. The structures of all three phases exhibit strong π–π stacking interactions between the Bi-bound PDC/HPDC and outer sphere organic molecules; these interactions effectively sandwich the arene molecules between bismuth complexes and thereby prevent molecular vibrations. Upon UV irradiation, the compounds containing pyrene and naphthalene displayed red and green emission, respectively, with quantum yields of 1.3(2) and 30.8(4)%. The emission was found to originate from the T1 → S0 transition of the corresponding arene and result in phosphorescence characteristic of the arene employed. By comparison, the azulene-containing compound displayed very weak blue-purple phosphorescence of unknown origin and is a rare example of T2 → S0 emission from azulene. The pyrene- and naphthalene-containing compounds both display radioluminescence, with intensities of 11 and 38% relative to bismuth germanate, respectively. Collectively, these results provide further insights into the structure–property relationships that underpin luminescence from Bi-based materials and highlight the utility of Bi–organic molecules in the realization of organic emission.

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Section: Resultssupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Unlocking Arene Phosphorescence in Bismuth–Organic Materials

Marwitz,

Dutta,

Conner

et al. 2024

Inorg. Chem.

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“…The lifetime of the RTP is τ phos (SDS) = 11.5 ms (Figure 6a), in good agreement with the PYR triplet lifetime in neat liquids and micelles. 34,39 Combining these two measurements allows us to estimate the phosphorescence radiative lifetime = τ t (SDS) rad phos QY phos phos = 3.8 ± 1.0 s. The radiative lifetime for free, uncomplexed PYR lies in the range 30−60 s. 40,41 For SDS-PYR, [Tl + ] = 0.01 M enhances the radiative rate by roughly a factor of 10, presumably through SOC interactions averaged over random ion−molecule configurations.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Boosting the Heavy Atom Effect by Cavitand Encapsulation: Room Temperature Phosphorescence of Pyrene in the Presence of Oxygen

et al. 2018

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A deep cavitand is used to encapsulate the aromatic molecule pyrene in its interior while also binding Tl ions with its terminal carboxylates. Steady-state and time-resolved spectroscopic experiments, along with quantum yield measurements, quantify the enhancements of intersystem crossing and room temperature phosphorescence due to cavitand encapsulation. These results are compared to those obtained for pyrene contained in sodium dodecyl sulfate micelles, which is the usual system used to generate room temperature phosphorescence. The combination of selective binding and strong Tl recognition by the cavitand enhances the intersystem crossing and decreases the phosphorescence radiative lifetime from ∼30 to 0.23 s. The cavitand also decreases the rate of O quenching by a factor of 100. Together, these factors can boost the room temperature phosphorescence signal by several orders of magnitude, allowing it to be detected in water without O removal. Host:guest recognition provides a route to molecular-scale triplet emitters that can function under ambient conditions.

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“…The phosphorescence emission spectra of 1a, 1b and 1d samples closely resemble the emission spectra of the aromatic counterparts (benzene, naphthalene and pyrene respectively). 28,30,48 With our current phosphorescence setup we were unable to detect any phosphorescence signal for the diaryl-pyrrole 1c, although phosphorescence has been previously reported for anthracene in EPA glasses at 77 K. 31,49 The singlet-triplet difference absorption spectra of the diarylpyrrole derivatives were also obtained from laser flash photolysis (Fig. 5).…”

Section: Triplet Statementioning

confidence: 63%

The effect of polyaromatic hydrocarbons on the spectral and photophysical properties of diaryl-pyrrole derivatives: an experimental and theoretical study

Pina

Pinheiro

Nascimento

et al. 2014

Phys. Chem. Chem. Phys.

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A new class of diaryl-pyrrole derivatives of the polyaromatic hydrocarbons (PAH) benzene, naphthalene, anthracene and pyrene were synthesized in a multicomponent reaction under microwave irradiation and studied in solution at room (293 K) and low (77 K) temperature. The study includes a complete spectroscopic evaluation (singlet-singlet and triplet-triplet absorption, fluorescence and phosphorescence spectra) as well as photophysical evaluation (fluorescence, phosphorescence and triplet lifetimes together with fluorescence and triplet occupation and singlet oxygen sensitization quantum yields). From the above evaluation, a complete set of deactivation rate constants (kF, kIC and kISC) could be obtained. The study was further complemented with TDDFT calculations. It is shown that, with the exception of the anthracene derivative, the diaryl-pyrrole moiety strongly influences the spectral and photophysical properties of the PAH and that with the exception of the benzene derivative, the excited state internal conversion deactivation channel of the diaryl-pyrrole derivatives is higher than that of the PAH counterparts.

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Study on micelle stabilized room temperature phosphorescence behaviour of pyrene by laser induced time resolved technique

Cited by 14 publications

References 9 publications

Unlocking Arene Phosphorescence in Bismuth–Organic Materials

Unlocking Arene Phosphorescence in Bismuth–Organic Materials

Boosting the Heavy Atom Effect by Cavitand Encapsulation: Room Temperature Phosphorescence of Pyrene in the Presence of Oxygen

The effect of polyaromatic hydrocarbons on the spectral and photophysical properties of diaryl-pyrrole derivatives: an experimental and theoretical study

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