scholarly journals Charge transfer dynamics in DNA revealed by time-resolved spectroscopy

2017 ◽  
Vol 8 (3) ◽  
pp. 1752-1762 ◽  
Author(s):  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Charge Transfer ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Charge Transfer Dynamics ◽  
Charge Transfer In Dna ◽  
Kinetics Of

Time-resolved study revealed kinetics of charge transfer in DNA.

Charge transfer in DNA

2013 ◽  
Vol 85 (7) ◽  
pp. 1367-1377
Author(s):  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Charge Transfer ◽  
Negative Charge ◽  
Charge Carriers ◽  
Spectroscopic Methods ◽  
Time Resolved ◽  
The Past ◽  
Excess Electrons ◽  
Charge Transfer Dynamics ◽  
Charge Transfer In Dna ◽  
Important Basis

In the past few decades, charge transfer in DNA has attracted considerable attention from researchers in a wide variety of fields ranging from bioscience and physical chemistry to nanotechnology. Charge transfer in DNA has been investigated using various techniques. Among them, time-resolved spectroscopic methods have provided information on charge-transfer dynamics in DNA, an important basis for therapy applications, nanomaterials, and so on. In charge transfer in DNA, holes and excess electrons act as positive and negative charge carriers, respectively. Hole-transfer (HT) dynamics have been investigated in detail, while the dynamics of excess electron transfer (EET) have only become clear rather recently. In the present paper, we summarize studies on the dynamics of HT and EET by several groups including ourselves.

Synthesis and photophysical properties of extended π conjugated naphthalimides

2017 ◽  
Vol 16 (4) ◽  
pp. 539-546 ◽  
Author(s):  
C. Rémy ◽  
C. Allain ◽  
I. Leray
Keyword(s):  
Charge Transfer ◽  
Dft Calculations ◽  
Photophysical Properties ◽  
Photoinduced Charge Transfer ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Td Dft ◽  
Photoinduced Charge

A series of π conjugated naphthalimide derivatives were prepared. Compounds display efficient photoinduced charge transfer in solution which was rationalized by time-resolved spectroscopy and modelled by TD-DFT calculations.

Time-resolved spectroscopy of charge transfer phenomena in organic solar cells

2015 ◽  
Author(s):  
Marina Gerhard ◽  
Andreas Arndt ◽  
Aina Quintilla ◽  
Arash Rahimi-Iman ◽  
Uli Lemmer ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

scholarly journals Time-Resolved Spectroscopy of the Metal-to-Metal Charge Transfer Excited State in Dinuclear Cyano-Bridged Mixed-Valence Complexes

2005 ◽  
Vol 44 (15) ◽  
pp. 5530-5536 ◽  
Author(s):  
Brendan P. Macpherson ◽  
Paul V. Bernhardt ◽  
Andreas Hauser ◽  
Stéphane Pagès ◽  
Eric Vauthey
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Mixed Valence ◽  
Time Resolved ◽  
Metal Charge ◽  
Time Resolved Spectroscopy ◽  
Metal Charge Transfer

scholarly journals Spatiotemporal imaging of anisotropic charge transfer in photocatalyst particles

2021 ◽  
Author(s):  
Can Li ◽  
Ruotian Chen ◽  
Zefeng Ren ◽  
Yu Liang ◽  
Thomas Dittrich ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Rational Design ◽  
Catalytic Surface ◽  
Time Resolved ◽  
Transfer Processes ◽  
Ballistic Electron ◽  
Photogenerated Electrons ◽  
Particle Level ◽  
Efficient Charge ◽  
Charge Transfer Dynamics

Abstract Water-splitting reactions using photocatalyst particles are promising routes for solar fuel production1-4. Photoinduced charge transfer from a photocatalyst to catalytic surface sites is key in ensuring photocatalytic efficiency5; however, it is challenging to understand this process, which spans a wide spatiotemporal range from nanometers to micrometers and from femtoseconds to seconds6-8. Although the steady-state charge distribution on single photocatalyst particles has been mapped using microscopic techniques9-11 and the averaged charge transfer dynamics in photocatalyst aggregations have been revealed via time-resolved spectroscopy12,13, spatiotemporally evolving charge transfer processes in single photocatalyst particles cannot be tracked, and the mechanism of charge transfer is unknown. Here, we report spatiotemporally resolved surface photovoltage measurements on Cu2O photocatalyst particles to map complete charge transfer processes throughout the femtosecond to second time scale at the single-particle level. We found that photogenerated electrons are transferred to the catalytic surface ballistically on a sub-picosecond timescale and are retained at this location for the duration, whereas photogenerated holes are transferred to a spatially separated surface and stabilized via selective trapping on a microsecond timescale. We demonstrate that these ballistic electron transfer and anisotropic trapping regimes, which challenge the classical perception of the drift–diffusion model, contribute to efficient charge separation in photocatalysis and improve the photocatalytic performance. We anticipate our findings to demonstrate the universality of other photoelectronic devices and facilitate the rational design of photocatalysts.

scholarly journals Excited States and Intermediates by Time-Resolved Infrared Spectroscopy

1999 ◽  
Vol 19 (1-4) ◽  
pp. 245-251 ◽  
Author(s):  
J. J. Turner ◽  
M. W. George ◽  
I. P. Clark ◽  
I. G. Virrels
Keyword(s):  
Infrared Spectroscopy ◽  
Excited State ◽  
Charge Transfer ◽  
Excited States ◽  
Fast Time ◽  
Time Resolved ◽  
Excited Species ◽  
Charge Transfer Transitions ◽  
Time Resolved Infrared Spectroscopy ◽  
Kinetics Of

For coordination compounds containing CO or CN groups, fast time-resolved infrared spectroscopy (TRIR) provides a convenient method of probing excited states and intermediates. TRIR has proved particularly powerful for probing the structure and kinetics of organometallic intermediates. The interpretation is particularly straightforward when combined with IR data from matrix isolation experiments, although there can be some subtle differences. In excited state studies, shifts in ν(CO) and ν(CN) frequencies, from ground to excited state, are sensitive to the changes in electron distribution on excitation, thus allowing the distinction between charge-transfer and non-charge-transfer transitions. Subtle effects on excited state ν(CO) band positions occur with change from fluid to rigid solvent-“infrared rigidochromism”. There is often a change in ν(CO) band width on excitation; this can be interpreted in terms of specific interactions between the excited species and the solvent. This paper presents some of our recent work in this area.

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