Laser photolysis studies on the intramolecular dimer radical cations formed in 1,3-dipyrenylpropanes

Tsuchida, Akira; Tsujii, Yoshinobu; Ohoka, Masataka; Yamamoto, Masahide

doi:10.1021/j100168a017

Cited by 48 publications

(34 citation statements)

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“…From studies of intramolecular dimer radical cations formed in 1,3-dipyrenylpropanes 70 it is known that the pyrene dimer cation has a charge resonance band. Depending on the distance and the overlap of the orbitals of the two pyrene moieties, this band is positioned from max Ͼ2.2 m in a dipyrenyl with a large intermoiety distance to max ϭ1.45 m in a solution of pyrene.…”

Section: A the Anisotropy Of The 810 Nm Transientsmentioning

confidence: 99%

Vibrational coherence in electron transfer: The tetracyanoethylene–pyrene complex

Wynne

Reid

Hochstrasser

1996

The Journal of Chemical Physics

136

132

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Articles you may be interested in TTF-TCNE a charge transfer π-molecular crystal with partial ionic ground state: Optical properties and electron molecular vibrations interaction Coherent vibrational wave packet motion is created in the excited charge-transfer state of the electron donor-acceptor complex between tetracyanoethylene ͑TCNE͒ and pyrene by an ultrashort ͑40 fs͒ 810 nm pump pulse. Observations of the dynamics of the TCNE-anion transient absorption and the disappearance of the bleach of the ground state absorption show that the electron-transfer reaction back to the ground state of the complex occurs on a 250 fs-1.5 ps time scale. The bleach recovery signal shows clear oscillations and both impulsive stimulated Raman scattering in the ground state and coherent repopulation of the ground state surface due to a vibrationally coherent electron transfer reaction were considered as the cause. Vibrational coherence has also been monitored by observing quantum beats in the stimulated emission from the charge transfer state back to the ground state in the near-ir. This observation strongly suggests that the electron transfer reaction is indeed vibrationally coherent and that the reaction rate is modulated by this coherence. This interpretation is corroborated by a classical Monte Carlo simulation of vibrationally coherent reactions in the inverted regime.

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Section: A the Anisotropy Of The 810 Nm Transientsmentioning

confidence: 99%

Vibrational coherence in electron transfer: The tetracyanoethylene–pyrene complex

Wynne

Reid

Hochstrasser

1996

The Journal of Chemical Physics

136

132

View full text Add to dashboard Cite

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“…Most CR bands of dimer radical cations of aromatic molecules are known to have energy. [16][17][18][19][20][21][22][23][24] The wavelength of the near-IR band observed in the present experiment corresponds with that (930-935 nm) of a CR band of a benzene dimer radical cation.17 Secondly, in very dilute solutions (< 1 x 10-5 mol dm-3) the band in the near-IR region was not observed, while the absorption in the visible region due to the radical itself was observed as mentioned above. This result strongly suggested that the near-IR band was caused by the intermolecular interactions.…”

Section: First Charge Resonance Band Observed By Steady Photolysis At...mentioning

confidence: 99%

First charge resonance band observed by steady photolysis at room temperature in solution

Nagamura¹,

Tanaka²,

Kawai³

et al. 1993

J. Chem. Soc., Chem. Commun.

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“…Similar effects of the trimethylene bridges on the intramolecular dimer radical cation formation were observed in transient species by ns laser photolysis for several aromatic chromophores. [2][3], [8][9][10][11][12]…”

Section: Resultsmentioning

confidence: 99%

“…There are considerable interests in electronic interactions in excimers and dimer radical canons for chromophores connected with different lengths of alkyl chains. [1][2][3] The charge resonance (CR) band is characteristic absorption of dimer radical canons, which is due to the splitting of the energy levels of both the ground and excited states by the electronic interaction between two chromophores sharing an unpaired electron. [4,5] It has been observed for intermolecular and intramolecular dimer radical cations formed by steady photolysis at very low temperature or by nanosecond (ns) laser flash photolysis and by ns pulse radiolysis at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Studies of Radicals Formed upon Photoexcitation of Bis(nitrostyrylpyridinium)alkane Ditetraphenylborate Salts.

Park¹,

Kawai²,

Nagamura³

2000

J. Photopol. Sci. Technol.

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The charge resonance (CR) interactions of a series of bis(4-(4-nitrostyryl)pyridinium)alkane derivatives upon steady photoexcitation through a band pass filter (405 nm) were studied by absorption spectroscopy at room temperature. The CR bands due to the intermolecular or intramolecular dimer radical cations were observed with peaks extending from 950 nm to 1 740 nm. The CR band of intermolecular dimer radical caton was common to all these compounds. The relative constant of dimer radical cations depended on the alkyl chain length and the irradiation time. The CR band of intramolecular dimer radical cation was sensitive to their geometrical structure and showed the formation of different dimer radical cations.

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Laser photolysis studies on the intramolecular dimer radical cations formed in 1,3-dipyrenylpropanes

Cited by 48 publications

References 0 publications

Vibrational coherence in electron transfer: The tetracyanoethylene–pyrene complex

Vibrational coherence in electron transfer: The tetracyanoethylene–pyrene complex

First charge resonance band observed by steady photolysis at room temperature in solution

Spectroscopic Studies of Radicals Formed upon Photoexcitation of Bis(nitrostyrylpyridinium)alkane Ditetraphenylborate Salts.

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