Synthesis, luminescence and excited state absorption properties of conjugated D-π-A and D-π-D phenothiazine compounds

Lu, Jiapeng; Zhu, Senqiang; Su, Huan; Liu, Rui; Li, Yang; Zhu, Hongjun

doi:10.1016/j.jlumin.2018.09.001

Cited by 20 publications

(7 citation statements)

References 46 publications

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“…As illustrated in Figure 2(b)-(d), MR1A-MR1C dyes exhibited a slightly positive solvatochromic effect, which implies that the emitting states in organic solvents possess π-π* states with few charge transfer states. [28] These assignments were also supported by the density functional theory (DFT) calculations, which are discussed in Section 2.4. Compared to the emission in organic solvents, the emission peaks in H 2 O are redshifted and become structureless.…”

Section: Fluorescence Emissionmentioning

confidence: 60%

Synthesis, Spectroscopic Characteristics, DFT Study and Dyeing Performance of Bischlorotriazine Based Water‐Soluble Reactive Dyes

Meng

Zhu

et al. 2022

ChemistrySelect

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Three reactive dyes, with bisbenzimidazole as the chromophore and bischlorotriazine as the active group, were synthesized and characterized. The photophysical properties of the dyes were discerned by UV‐vis absorption, emission, and density functional theory calculations. All the dyes exhibited two absorption bands in the UV‐vis region. The main band at 270 nm was attributed to the intramolecular π‐π* transition, whereas the absorption at 360 nm was assigned to the π‐π* mixed intramolecular charge transfer transitions. As the planarity of the benzimidazole components was enhanced, the energy gap of these dyes decreased, which caused a redshift. The relationship between the structure and dyeing properties of the dyes was also studied from the perspective of dyeing depth and fastness. The results showed that these dyes can be dyed on silk effectively, the dyeing depths were in the range of 0.08∼35 under salt‐free conditions and the dry/wet rubbing fastness of these dyes could reach grades 4–5. In summary, these reactive dyes could be potential dyes for salt‐free dyeing applications.

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Section: Fluorescence Emissionmentioning

confidence: 60%

Synthesis, Spectroscopic Characteristics, DFT Study and Dyeing Performance of Bischlorotriazine Based Water‐Soluble Reactive Dyes

Meng

Zhu

et al. 2022

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“…The ground-state geometry of ATZ1–ATZ5 is fully optimized using DFT at the B3LYP/6-31g* level. 19 The calculation results show that the LUMO (lowest unoccupied molecular orbital) energy levels of the five compounds compared with the HOMO (highest occupied molecular orbital) energy levels show no obvious charge transfer (Fig. 4).…”

Section: Resultsmentioning

confidence: 94%

Benzothiazole derivatives with varied π-conjugation: synthesis, tunable solid-state emission, and application in single-component LEDs

Song

Cheng

et al. 2022

J. Mater. Chem. C

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“…Compared with photoluminescence properties of compounds PDI-1-PDI-3 at room temperature, the emission spectra of PDI-1-PDI-3 at 77 K were different and became more structured. [14,33] For PDI-1 and PDI-2, the emission spectra at 77 K exhibited clear vibronic structures, but remained at similar energy levels as that at room temperature. Therefore, they were still fluorescent bu mainly from the 1 π-π* state.…”

Section: Photoluminescencementioning

confidence: 90%

“…result suggested that the absorbing excited state mainly comes from a 3 π-π* state in the π-conjugated backbone. [14] Furthermore, the lifetime values of the singlet excited state were shorter than the lifetimes of the triplet excited state. This indicated that the source of the emission state of PDI-1-PDI-3 was the singlet state.…”

Section: Density Functional Theory Calculationsmentioning

confidence: 97%

Synthesis, luminescence, and excited‐state absorption properties of disubstituted perylene diimide derivatives modified at bay region

et al. 2021

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Three A-π-A or D-π-D perylene diimide (PDI) derivatives with varied groups on π-conjugate were synthesized and characterized. The photophysical properties of these compounds were systematically studied by spectral experiments and density functional theory calculations. All compounds displayed intense absorption bands at 300-800 nm wavelengths. However, diverse groups on the π-conjugate influenced the UV-vis absorption. Electron-withdrawing groups on PDI-2 caused a slight red shift at the 350-400 nm wavelength and a blue shift after 400 nm wavelength. At the same time, the electron-donating substituents on PDI-3 caused an obvious red shift of this band. These PDI derivatives exhibited emission in solution at room temperature (λ em = 500-850 nm). The quantum yield of PDI-3 decreased, while the electron-donating substituents were introduced to the π-conjugated motifs. However, the quantum yield of PDI-2 increased when electron-withdrawing substituents were introduced to the π-conjugated motifs. In addition, PDI-1 and PDI-2 exhibited broad triplet transient absorption in the visible region. These photophysical properties could help us to understand the relationship between structure and photophysical properties of perylene diimide derivatives and exploit more original perylene diimide-based optical functional materials.

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Synthesis, luminescence and excited state absorption properties of conjugated D-π-A and D-π-D phenothiazine compounds

Cited by 20 publications

References 46 publications

Synthesis, Spectroscopic Characteristics, DFT Study and Dyeing Performance of Bischlorotriazine Based Water‐Soluble Reactive Dyes

Synthesis, Spectroscopic Characteristics, DFT Study and Dyeing Performance of Bischlorotriazine Based Water‐Soluble Reactive Dyes

Benzothiazole derivatives with varied π-conjugation: synthesis, tunable solid-state emission, and application in single-component LEDs

Synthesis, luminescence, and excited‐state absorption properties of disubstituted perylene diimide derivatives modified at bay region

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