D–π–A type conjugated indandione derivatives: ultrafast broadband nonlinear absorption responses and transient dynamics

Chen, Lu; Wu, Xingzhi; Li, Zhongguo; Niu, Ruipeng; Zhou, Wenfa; Liu, Kun; Sun, Yingfei; Shao, Zhangyang; Yang, Junyi; Ye, Song

doi:10.1039/d2ra00349j

Cited by 11 publications

(2 citation statements)

References 50 publications

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“…The decay curve also exhibits two decay processes. According to the τ 1 time scale, the generation of the fast decay component may contribute to the thermal vibrational relaxation or exciton–exciton annihilation process. − The formation of the long lifetime τ 2 is then assigned to the relaxation process from the LE state to the ground state. The ultrafast dynamics curve of Pc-P-Pc is shown in Figure e, and a strong photobleaching signal is found at a probe wavelength of 680 nm.…”

Section: Resultsmentioning

confidence: 99%

One- and Two-Photon Photophysical Properties, Ultrafast Dynamics, and DFT Study of Three Modified Zinc Phthalocyanines

Zhang,

Wang,

Meng

et al. 2024

J. Phys. Chem. A

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As two-photon absorption (TPA) materials, phthalocyanine molecules have promising application prospects due to their large TPA absorption cross-section, high thirdorder nonlinear optical susceptibility, and ultrafast response characteristics. In this work, optical properties and the ultrafast response of three modified zinc phthalocyanine molecules (P-HPcZn, Pc-P-Pc, and (DR1) 4 PcZn) were analyzed. No obvious side-shoulder absorption peaks in the Q-band can be observed from the steady-state absorption spectra of the three molecules, confirming the lack of aggregation products in the solutions of our measurement. Open-aperture Z-scan results show relatively large TPA cross-section values of 136.4 and 55.3 GM for Pc-P-Pc and (DR1) 4 PcZn, respectively. The nonlinear optical results show that the absorption process observed under the excitation of femtosecond pulses is a reverse saturable absorption (RSA) mechanism. Up-conversion fluorescence spectra of (DR1) 4 PcZn in THF solution indicate that the fluorescence emission mechanism is TPA. In the study of ultrafast dynamics, the transient absorption spectra were investigated and the decay lifetime of the dynamic traces corresponding to some representative probe wavelengths was obtained through data fitting with a multi-exponential function. Finally, the charge transfer and excited state properties of the modified zinc phthalocyanine molecules were discussed in depth by the DFT method. The energy gaps of P-HPcZn, Pc-P-Pc, and (DR1) 4 PcZn are 2.16, 1.39, and 2.13 eV, respectively. The results indicate that the Pc-P-Pc of donor−acceptor−donor (D-A-D) structure has the smallest energy gap as well as the best charge transfer properties.

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Section: Resultsmentioning

confidence: 99%

One- and Two-Photon Photophysical Properties, Ultrafast Dynamics, and DFT Study of Three Modified Zinc Phthalocyanines

Zhang,

Wang,

Meng

et al. 2024

J. Phys. Chem. A

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“…Understanding atomistic and molecular structure–property relationships that can optimize interfacial charge-transfer processes − is important for the development of optoelectronic devices. The dynamics of CT can be studied using femtosecond transient absorption and time-resolved emission measurements. ,− The most successful and practical theory for understanding CT kinetics is the semiclassical Marcus theory . Remarkably, the CT kinetics depends on only four parameters: the Gibbs energy difference between the donor and acceptor, reorganization energy, electronic coupling between the donor and acceptor, and thermal temperature.…”

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confidence: 99%

Charge-Transfer Luminescence in a Molecular Donor–Acceptor Complex: Computational Insights

Forde

Freixas

Fernández-Alberti

et al. 2022

J. Phys. Chem. Lett.

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Donor–acceptor molecular complexes are a popular class of materials utilizing charge-transfer states for practical applications. A recent class of donor–acceptor dyads based on the fluorescent BODIPY functionalized with triphenylamine (TPA) shows the peculiar property of dual fluorescence. It is hypothesized that instead of the sensitized charge-transfer state being optically dark, it provides an additional bright radiative pathway. Here we use time-dependent density functional theory to characterize the energetic alignment of excitonic and charge-transfer states in a BODIPY-TPA molecular complex. We observe that using a long-range exchange corrected functional in combination with state-specific solvation scheme gives a qualitatively correct alignment of the exciton and charge-transfer states and an enhancement in oscillator strength for the equilibrium solvated charge-transfer state, in agreement with experiment. This work provides rationalization of charge-transfer state emission and provides a foundation to explore charge-transfer using ab initio excited-state nonadiabatic dynamics.

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Low‐Molecular‐Weight J‐Aggregate Solid Red Emitter for Selective and Quantitative Detection of Cyanide

Padghan

Wang

et al. 2023

Chemistry An Asian Journal

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A dimethylaniline (donor)-indanedione (acceptor) conjugate (sensor 1) with a very low molecular weight of 277 g mol À 1 and intramolecular charge transfer (ICT) characteristics was synthesized. Sensor 1 shows weak ICT fluorescence in solution, but strong emission (Φ = 16%) in the solid state owing to intramolecular and intermolecular CÀ H•••O hydrogen bonds that inhibit the free rotation of the exocyclic CÀ C single bond. Compared to yellow emitter 1Y, which has a similar donor-acceptor structure, sensor 1 shows red fluorescence in the solid state owing to J-aggregate formation. The colorimetric and fluorometric responses of sensor 1 to cyanide in both solution and solid state are due to the nucleophilic addition of cyanide to the β-conjugated carbon of the indanedione group, which prohibits ICT. Additionally, inexpensive portable paper-based test kits based on sensor 1 were easily prepared and could be used for fast and quantitative naked-eye cyanide detection in real time.

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D–π–A type conjugated indandione derivatives: ultrafast broadband nonlinear absorption responses and transient dynamics

Abstract: In the red region (650–800 nm), the nonlinear absorption of trithiophene-based compound INT3 is greater than that of triphenylamine-based compound INB3, while in the NIR region (800–1100 nm), the strength of nonlinear absorption is the opposite.

Cited by 11 publications

References 50 publications

One- and Two-Photon Photophysical Properties, Ultrafast Dynamics, and DFT Study of Three Modified Zinc Phthalocyanines

One- and Two-Photon Photophysical Properties, Ultrafast Dynamics, and DFT Study of Three Modified Zinc Phthalocyanines

Charge-Transfer Luminescence in a Molecular Donor–Acceptor Complex: Computational Insights

Low‐Molecular‐Weight J‐Aggregate Solid Red Emitter for Selective and Quantitative Detection of Cyanide

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