Photo-induced intramolecular charge transfer from antenna to anchor groups in phenoxazine dyes

Yang, Songqiu; Liu, Jianyong; Zhou, Panwang; Han, Keli; He, Guo‐Zhong

doi:10.1016/j.cplett.2011.06.088

Cited by 19 publications

(15 citation statements)

References 18 publications

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“…This proves the transitions with ICT characteristic mainly happen between HOMO and LUMO. Table S2 shows that the electronic density at the helicene-imide backbone significantly increases accompanying with a decrease at the lateral donor groups from HOMO to LUMO, which provides a clear picture of the ICT characteristic 35 . The CDD (charge difference density, shown in Supplementary Table S2 ) further shows the same ICT nature as above.…”

Section: Resultsmentioning

confidence: 97%

Ultrafast Investigation of Intramolecular Charge Transfer and Solvation Dynamics of Tetrahydro[5]-helicene-Based Imide Derivatives

Zhu

et al. 2016

Sci Rep

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We report the excited-state intramolecular charge transfer (ICT) characteristics of four tetrahydro[5] helicene-based imide (THHBI) derivatives with various electron-donating substitutes in different polarity of solvents using steady-state, time-resolved transient absorption (TA) spectroscopy. It is found that, the small bathochromic-shift of the absorption spectra but large red shift of the emission spectra for all dyes with increasing solvent polarity indicates the larger dipole moment of the excited state compared to ground state. The results of theoretical calculations exhibit the charge transfer from the terminal donors to helical backbone, which accounts for the degrees of red shift of the emission spectra from different extent of ICT nature. Time-resolved TA spectra recorded as a function of electron-donating substitutes and solvent polarity show the dye with stronger donors (THHBI-PhNPh2) in more polar solvent behaves faster excited-state ICT relaxation, leading to the formation of solvent-stabilized ICT state (ICT’ state) from the excited ICT state; The dyes (THHBI-Ph, THHBI-PhCF3 and THHBI-PhOMe) with relative weaker donors show weaker dependence on solvent polarity, and instead of that intersystem crossing (ISC) becomes possible from ICT state to triplet state.

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Section: Resultsmentioning

confidence: 97%

Ultrafast Investigation of Intramolecular Charge Transfer and Solvation Dynamics of Tetrahydro[5]-helicene-Based Imide Derivatives

Zhu

et al. 2016

Sci Rep

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“…Femtosecond transient ESA processes also have been investigated in a number of organic structures, such as β -carotene, 13 photoactive yellow protein (PYP), 14 dimethylamino-substituted diphenylmethane dyes, 23 fucoxanthin, 16 trans -4-dicyanomethylene-2-methyl-6- p -dimethylamin-ostyryl-4Hpyran, 20 etc., to reveal the nature of excited-state relaxation mechanisms, 16,19 intermediate stages in photochemical reactions, 24 and ultrafast photo-induced energy and charge transfer processes, 16,25 including the role of transient excited electronic states with efficient stimulated emission (gain) properties. 14,23,26,27 …”

Section: Introductionmentioning

confidence: 99%

Transient Excited-State Absorption and Gain Spectroscopy of a Two-Photon Absorbing Probe with Efficient Superfluorescent Properties

et al. 2012

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The synthesis, linear photophysical properties, two-photon absorption (2PA), excited-state transient absorption, and gain spectroscopy of a new fluorene derivative tert-butyl 4,4′-(4,4′ (1E,1′E)-2,2′-(9,9-bis(2- (2-ethoxyethoxy)ethyl)-9H-fluorene-2,7-diyl)bis(ethene-2,1-diyl)bis(4,1 phenylene)]dipiperazine-1-carboxylate (1) are reported. The steady-state linear absorption and fluorescence spectra, along with excitation anisotropy, fluorescence lifetimes, and photochemical stability of 1 were investigated in a number of organic solvents at room temperature. The 2PA spectra of 1 with a maximum cross-section of ~ 300 GM were obtained with a 1 kHz femtosecond laser system using open-aperture Z-scan and two-photon-induced fluorescence methods. The transient excited-state absorption (ESA) and gain kinetics of 1 were investigated by a femtosecond pump-probe methodology. Fast relaxation processes (~1–2 ps) in the gain and ESA spectra of 1 were revealed in ACN solution, attributable to symmetry-breaking effects in the first excited state. Efficient superfluorescence properties of 1 were observed in a nonpolar solvent under femtosecond excitation. One- and two-photon fluorescence microscopy imaging of HCT 116 cells incubated with probe 1 was accomplished, suggesting the potential of this new probe in two-photon fluorescence microscopy bioimaging.

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“…Time resolved transient absorption spectra were recorded using a transient absorption (TA) spectrometer with femtosecond resolution. 35 The laser used for excitation was a Hurricane Ti:Sapphire laser system (Spectra Physics) capable of 800 nm laser pulses of 1 mJ pulse À1 (width of 130 fs) at a rate of 1 kHz. A fraction (5%) of the beam was used to generate a probe pulse.…”

Section: Measurementmentioning

confidence: 99%

Controllable synthesis of ultrasmall CuInSe₂ quantum dots for photovoltaic application

You

Jiang

et al. 2014

RSC Adv.

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Photo-induced intramolecular charge transfer from antenna to anchor groups in phenoxazine dyes

Cited by 19 publications

References 18 publications

Ultrafast Investigation of Intramolecular Charge Transfer and Solvation Dynamics of Tetrahydro[5]-helicene-Based Imide Derivatives

Ultrafast Investigation of Intramolecular Charge Transfer and Solvation Dynamics of Tetrahydro[5]-helicene-Based Imide Derivatives

Transient Excited-State Absorption and Gain Spectroscopy of a Two-Photon Absorbing Probe with Efficient Superfluorescent Properties

Controllable synthesis of ultrasmall CuInSe₂ quantum dots for photovoltaic application

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Photo-induced intramolecular charge transfer from antenna to anchor groups in phenoxazine dyes

Cited by 19 publications

References 18 publications

Ultrafast Investigation of Intramolecular Charge Transfer and Solvation Dynamics of Tetrahydro[5]-helicene-Based Imide Derivatives

Ultrafast Investigation of Intramolecular Charge Transfer and Solvation Dynamics of Tetrahydro[5]-helicene-Based Imide Derivatives

Transient Excited-State Absorption and Gain Spectroscopy of a Two-Photon Absorbing Probe with Efficient Superfluorescent Properties

Controllable synthesis of ultrasmall CuInSe2 quantum dots for photovoltaic application

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Controllable synthesis of ultrasmall CuInSe₂ quantum dots for photovoltaic application