Transfer of trispolypyridineruthenium(II) chelates in their ground and excited states across the water/1,2-dichloroethane interface

1991 ◽  
Vol 56 (1) ◽  
pp. 130-139 ◽  
Author(s):  
Josef Hanzlík ◽  
Anna Maria Camus
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Divalent Cation ◽  
Ground States ◽  
Transport Parameters ◽  
Photoinduced Charge Transfer ◽  
Photoinduced Charge ◽  
Voltammetric Measurements ◽  
Reversible Transfer

Transfer of trispolypyridineruthenium(II) chelates of the type [Ru(chel)3]2+, where chel is 2,2’-bipyridine, 2,2’-bipyrimidine or 2,2’-bipyrazine, in their ground states across the water/1,2-dichloroethane interface was classified as the reversible transfer of a divalent cation. Thermodynamic and transport parameters characterizing this transfer were obtained from voltammetric measurements. Photoexcitation of these chelates gives rise to the photoinduced charge transfer across the water/1,2-dichloroethane interface.

scholarly journals Exploring ultraviolet photoinduced charge-transfer dynamics in a model dinucleotide of guanine and thymine

2019 ◽  
Vol 21 (26) ◽  
pp. 14407-14417 ◽  
Author(s):  
Marta Duchi ◽  
Michael P. O’Hagan ◽  
Rhea Kumar ◽  
Simon J. Bennie ◽  
M. Carmen Galan ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Product Formation ◽  
Photoinduced Charge Transfer ◽  
Charge Transfer Dynamics ◽  
Franck Condon ◽  
Photoinduced Charge

We unequivocally demonstrate that the Franck–Condon excited states of 2′-deoxyguanosine 3′-monophospate 5′-thymidine are significantly delocalised across both nucleobases, and mediate ultrafast exciplex product formation.

Transfer of trisbipyridine transition metal complexes across the water-dichloroethane interface

1987 ◽  
Vol 52 (4) ◽  
pp. 838-847 ◽  
Author(s):  
Josef Hanzlík ◽  
Jan Hovorka ◽  
Anna Maria Camus
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Divalent Cation ◽  
Central Atom ◽  
Transport Parameters ◽  
Chemical Changes ◽  
Ligand Dissociation ◽  
Voltammetric Measurements

Transfer of trisbipyridine transition metal complexes [M(bpy)3]2+ (bpy = bipyridine) across the water-1,2-dichloroethane interface can be classified as a simple transfer of a divalent cation in case that the central atom M = Fe, Ni, Ru or Os, while for M = Co, Cu or Zn the charge transfer is accompanied by considerable chemical changes, such as the ligand dissociation and the solvolysis. Thermodynamic and transport parameters characterizing the transfer of [M(bpy)3]2+ ions from water to 1,2-dichloroethane have been determined from voltammetric measurements.

Dynamics of photoinduced charge-transfer in dimethylamino-substituted triphenylphosphines

1996 ◽  
Vol 93 ◽  
pp. 1697-1713 ◽  
Author(s):  
P Changenet ◽  
P Plaza ◽  
MM Martin ◽  
YH Meyer ◽  
W Rettig
Keyword(s):  
Charge Transfer ◽  
Photoinduced Charge Transfer ◽  
Photoinduced Charge

Photoinduced Charge Transfer Dynamics in Carotenoid-Porphyrin-C60 Triad via the Linearized Semiclassical Nonequilibrium Fermi's Golden Rule

2020 ◽  
Author(s):  
Zhengqing Tong ◽  
Margaret S. Cheung ◽  
Barry D. Dunietz ◽  
Eitan Geva ◽  
Xiang Sun
Keyword(s):  
Charge Transfer ◽  
Golden Rule ◽  
Time Dependent ◽  
Rate Coefficients ◽  
Initial State ◽  
Photoinduced Charge Transfer ◽  
Transfer Rates ◽  
Fermi's Golden Rule ◽  
Photoinduced Charge ◽  
Fermi’S Golden Rule

The nonequilibrium Fermi’s golden rule (NE-FGR) describes the time-dependent rate coefficient for electronic transitions, when the nuclear degrees of freedom start out in a <i>nonequilibrium</i> state. In this letter, the linearized semiclassical (LSC) approximation of the NE-FGR is used to calculate the photoinduced charge transfer rates in the carotenoid-porphyrin-C<sub>60</sub> molecular triad dissolved in explicit tetrahydrofuran. The initial nonequilibrium state corresponds to impulsive photoexcitation from the equilibrated ground-state to the ππ* state, and the porphyrin-to-C<sub>60</sub> and the carotenoid-to-C<sub>60</sub> charge transfer rates are calculated. Our results show that accounting for the nonequilibrium nature of the initial state significantly enhances the transition rate of the porphyrin-to-C<sub>60</sub> CT process. We also derive the instantaneous Marcus theory (IMT) from LSC NE-FGR, which casts the CT rate coefficients in terms of a Marcus-like expression, with explicitly time-dependent reorganization energy and reaction free energy. IMT is found to reproduce the CT rates in the system under consideration remarkably well.

scholarly journals Colloidal CdSe nanocrystals are inherently defective

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tamar Goldzak ◽  
Alexandra R. McIsaac ◽  
Troy Van Voorhis
Keyword(s):  
Charge Transfer ◽  
Energy Spectrum ◽  
Surface Structure ◽  
Short Range ◽  
Surface Defects ◽  
Low Energy ◽  
Lewis Base ◽  
Cdse Nanocrystals ◽  
Photoinduced Charge Transfer ◽  
Photoinduced Charge

AbstractColloidal CdSe nanocrystals (NCs) have shown promise in applications ranging from LED displays to medical imaging. Their unique photophysics depend sensitively on the presence or absence of surface defects. Using simulations, we show that CdSe NCs are inherently defective; even for stoichiometric NCs with perfect ligand passivation and no vacancies or defects, we still observe that the low energy spectrum is dominated by dark, surface-associated excitations, which are more numerous in larger NCs. Surface structure analysis shows that the majority of these states involve holes that are localized on two-coordinate Se atoms. As chalcogenide atoms are not passivated by any Lewis base ligand, varying the ligand should not dramatically change the number of dark states, which we confirm by simulating three passivation schemes. Our results have significant implications for understanding CdSe NC photophysics, and suggest that photochemistry and short-range photoinduced charge transfer should be much more facile than previously anticipated.

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