Ultrafast spectroscopic characterization of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and its radical anion (TCNQ−)

Ma, Lin; Hu, Peng; Kloc, Christian; Sun, Handong; Michel‐Beyerle, M. E.; Gurzadyan, Gagik G.

doi:10.1016/j.cplett.2014.06.029

Cited by 39 publications

(55 citation statements)

References 29 publications

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“…The main deactivation process was assigned to the efficient internal conversion to the ground state. [31] A fluorescence spectrum with a fluorescence maximum at 459 nm was also reported for carbon tetrachloride. [32] Energy levels of several electronically excited states of TCNQ were calculated with a density functional theory (DFT) calculation, and the oscillator strength of the S 1 -S 0 transition was reported to be f = 1.07.…”

Section: Photophysics and Inverted Solvatochromism Of 7788-tetracymentioning

confidence: 72%

Photophysics and Inverted Solvatochromism of 7,7,8,8‐Tetracyanoquinodimethane (TCNQ)

et al. 2019

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We report absorption, fluorescence, and Raman spectroscopy of 7,7,8,8‐tetracyanoquinodimethane (TCNQ) in a variety of solvents. The fluorescence quantum yields (QYs) of linear alkane solutions are similar to one another, but QY is shown to acutely decrease in other solvents with increasing polarities. The slope of the solvatochromic plot of absorption maxima is inverted from negative to positive with an increase in solvent polarity. A significant change in the frequency of carbon‐carbon double bond stretching modes is not observed in Raman spectra of TCNQ in different solvents. The molar absorption coefficient is determined to calculate the oscillator strength of the absorption band. The radiative decay rate constant calculated from the oscillator strength is approximately ten times larger than that elucidated from the fluorescence lifetime and QY. These spectroscopic parameters reveal that the relaxation occurs from a Franck‐Condon excited state to a distinct fluorescence emissive state with a smaller transition dipole moment.

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Section: Photophysics and Inverted Solvatochromism Of 7788-tetracymentioning

confidence: 72%

Photophysics and Inverted Solvatochromism of 7,7,8,8‐Tetracyanoquinodimethane (TCNQ)

et al. 2019

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“…They reported that the fluorescence QY of TCNQ in dichloromethane is ∼8×10 −3 weaker than that in hexane. This result has dispelled the conventional prejudice that TCNQ does not show observable fluorescence as predicted by studies carried out in polar solvents . Their finding raises a question of what is the origin of the solvent dependent fluorescence property.…”

Section: Methodsmentioning

confidence: 90%

“…Not only as the electron transport material, but TCNQ and its derivatives are extremely important as versatile doping agents for functional materials,,, components of organic magnets, Langmuir‐Blodgett films, field‐effect transistors,, organic crystals, and nonlinear optical materials . Understanding the electronic and photochemical properties of TCNQ is of fundamental importance for further development of this functional material . Very recently, Iimori and coworkers reported that the fluorescence quantum yield (QY) of TCNQ in solution shows remarkable dependence on polarity of the solvent .…”

Section: Methodsmentioning

confidence: 99%

Laser Spectroscopy and Lifetime Measurements of the S₁ State of Tetracyanoquinodimethane (TCNQ) in a Cold Gas‐Phase Free‐Jet

et al. 2019

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The S1 electronic state of 7,7,8,8‐Tetracyanoquinodimethane (TCNQ) has been investigated by laser induced fluorescence (LIF), dispersed fluorescence (DF) spectroscopy, and lifetime measurements under jet‐cooled conditions in the gas‐phase. The LIF spectrum showed a weak origin band at 412.13 nm (24262 cm−1) with prominent progression and combination bands involving vibrations of 327, 1098, and 2430 cm−1. In addition, very strong bands appeared at ∼363.6 nm (3300 cm−1 above the origin). Both the LIF and DF spectra indicate considerable geometric change in the S1 state. The fluorescence lifetime of S1 at zero‐point level was obtained to be 220 ns. This lifetime is 40 times longer than the radiative lifetime estimated from the S1−S0 oscillator strength. Furthermore, the lifetimes of the vibronic bands exhibited drastic energy dependence, indicating a strong mixing with the triplet (T1) or intramolecular charge‐transfer (CT) state. This study is thought to disclose intrinsic nature of TCNQ, which has been well known as a component of organic semiconductors and a versatile p‐type dopant.

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“…In our recent study19, we have characterized the spectroscopic properties of TCNQ in acetonitrile. The fluorescence recorded at room temperature is very weak (quantum yield ϕ < 10 −4 ), with ultrafast decay time (800 fs).…”

Section: Resultsmentioning

confidence: 99%

Single photon triggered dianion formation in TCNQ and F4TCNQ crystals

Jiang

et al. 2016

Sci Rep

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Excited state dynamics in two strong organic electron acceptor systems, TCNQ and F4TCNQ single crystals, was studied. After absorption of a single photon, dianions are formed in both crystals on ultrashort timescale: TCNQ τ < 50 fs, F4TCNQ τ = 4 ps. By use of transient absorption spectroscopy, we demonstrate that the dianion formation in F4TCNQ is mediated by the radical anion precursor which is described by a two-step model. Our measurements show the phenomenon that in this quinoid acceptor crystals in the absence of additional donor molecule, it is possible to resolve the two step formation of a doubly charged anion upon absorption of a single low energy photon (2.6 eV).

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Ultrafast spectroscopic characterization of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and its radical anion (TCNQ−)

Cited by 39 publications

References 29 publications

Photophysics and Inverted Solvatochromism of 7,7,8,8‐Tetracyanoquinodimethane (TCNQ)

Photophysics and Inverted Solvatochromism of 7,7,8,8‐Tetracyanoquinodimethane (TCNQ)

Laser Spectroscopy and Lifetime Measurements of the S₁ State of Tetracyanoquinodimethane (TCNQ) in a Cold Gas‐Phase Free‐Jet

Single photon triggered dianion formation in TCNQ and F4TCNQ crystals

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Ultrafast spectroscopic characterization of 7,7,8,8-tetracyanoquinodimethane (TCNQ) and its radical anion (TCNQ−)

Cited by 39 publications

References 29 publications

Photophysics and Inverted Solvatochromism of 7,7,8,8‐Tetracyanoquinodimethane (TCNQ)

Photophysics and Inverted Solvatochromism of 7,7,8,8‐Tetracyanoquinodimethane (TCNQ)

Laser Spectroscopy and Lifetime Measurements of the S1 State of Tetracyanoquinodimethane (TCNQ) in a Cold Gas‐Phase Free‐Jet

Single photon triggered dianion formation in TCNQ and F4TCNQ crystals

Contact Info

Product

Resources

About

Laser Spectroscopy and Lifetime Measurements of the S₁ State of Tetracyanoquinodimethane (TCNQ) in a Cold Gas‐Phase Free‐Jet