Abstract:The electron transfer (ET) dynamics of an unusually rigid pi-stacked (porphinato)zinc(II)-spacer-quinone (PZn-Q) system, [5-[8'-(4' '-[8' ''-(2' '' ',5' '' '-benzoquinonyl)-1' ''-naphthyl]-1' '-phenyl)-1'-naphthyl]-10,20-diphenylporphinato]zinc(II) (2a-Zn), in which sub-van der Waals interplanar distances separate juxtaposed porphyryl, aromatic bridge, and quinonyl components of this assembly, have been measured by ultrafast pump-probe transient absorption spectroscopy over a 80-320 K temperature range in 2-me… Show more
“…The slower rising component (k 1 , 1 ) exhibited an unusual temperature dependence while the faster one (k 2 , 2 ) was nearly temperature independent over all temperature ranges. It is important to note that the ratio of amplitudes of these two components (A 1 /A 2 , 1 > 2 ) became smaller as the temperature decreased [152]. The sole decay component ( 3 ) is assigned as CR in these cases.…”
Section: The Temperature Dependence Of 2a-zn Electron Transfer Dynamimentioning
confidence: 91%
“…For the QM calculation, an inner-sphere reorganization energy i = 0.5 eV and an averaged single high-frequency vibrational quantumh ω = 1600 cm −1 were used. The temperature dependent inverse longitudinal relaxation times of 2-MTHF ( −1 L ) are shown as black triangles [152]. [204,[270][271][272][273][274][275][276][277][278][279][280][281][282].…”
Section: Coupling Charge Transfer and Solvation Dynamics; The Solventmentioning
confidence: 99%
“…(26). The temperature dependent solvent longitudinal relaxation rate constants ( −1 L ) for 2-MTHF are depicted as black triangles [152]. 100 cm −1 .…”
Section: Electron Transfer Reactions Involving Vibrationally Unequilimentioning
confidence: 99%
“…The best biexponential function fit for 310 K and the triexponential function fits for 120 K and 80 K are depicted by thin lines. Experimental conditions: ex = 557 nm, solvent = 2-MTHF, magic angle polarization[152].…”
mentioning
confidence: 99%
“…Deduced electronic coupling matrix elements and activation barriers for the two apparent linear regimes are shown as insets[152].…”
“…The slower rising component (k 1 , 1 ) exhibited an unusual temperature dependence while the faster one (k 2 , 2 ) was nearly temperature independent over all temperature ranges. It is important to note that the ratio of amplitudes of these two components (A 1 /A 2 , 1 > 2 ) became smaller as the temperature decreased [152]. The sole decay component ( 3 ) is assigned as CR in these cases.…”
Section: The Temperature Dependence Of 2a-zn Electron Transfer Dynamimentioning
confidence: 91%
“…For the QM calculation, an inner-sphere reorganization energy i = 0.5 eV and an averaged single high-frequency vibrational quantumh ω = 1600 cm −1 were used. The temperature dependent inverse longitudinal relaxation times of 2-MTHF ( −1 L ) are shown as black triangles [152]. [204,[270][271][272][273][274][275][276][277][278][279][280][281][282].…”
Section: Coupling Charge Transfer and Solvation Dynamics; The Solventmentioning
confidence: 99%
“…(26). The temperature dependent solvent longitudinal relaxation rate constants ( −1 L ) for 2-MTHF are depicted as black triangles [152]. 100 cm −1 .…”
Section: Electron Transfer Reactions Involving Vibrationally Unequilimentioning
confidence: 99%
“…The best biexponential function fit for 310 K and the triexponential function fits for 120 K and 80 K are depicted by thin lines. Experimental conditions: ex = 557 nm, solvent = 2-MTHF, magic angle polarization[152].…”
mentioning
confidence: 99%
“…Deduced electronic coupling matrix elements and activation barriers for the two apparent linear regimes are shown as insets[152].…”
The dependence of the photoinduced charge transfer rate constant on the pump pulse carrier frequency is shown to be strong, and it is considerably affected by the value of the reorganization energy of low-frequency modes at the stage of excitation. In the area of small values of the reorganization energy, the dependence of the charge transfer rate constant on the pump pulse carrier frequency is strongly nonmonotonic that is caused by vibrational resonances and variation of the initial position of the wave packet on the term of the locally excited state. Increasing the reorganization energy smoothes the dependence. The smoothing is caused by the broadening of the vibrational resonances and their overlapping. The highfrequency vibrational mode excitation typically accelerates the charge transfer in both areas of high and low exergonicity and decelerates it in the vicinity of the Marcus barrierless region.
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