Decreased Interfacial Charge Recombination Rate Constants with N3-Type Sensitizers

2010 ◽  
Vol 1 (11) ◽  
pp. 1725-1728 ◽  
Author(s):  
Maria Abrahamsson ◽  
Patrik G. Johansson ◽  
Shane Ardo ◽  
Andrew Kopecky ◽  
Elena Galoppini ◽  
...  
Keyword(s):  
Rate Constants ◽  
Recombination Rate ◽  
Charge Recombination ◽  
Interfacial Charge

Tuning Charge Recombination Rate Constants through Inner-Sphere Coordination in a Copper(I) Donor−Acceptor Compound

2000 ◽  
Vol 39 (17) ◽  
pp. 3765-3770 ◽  
Author(s):  
Donald V. Scaltrito ◽  
Craig A. Kelly ◽  
Mark Ruthkosky ◽  
Mark C. Zaros ◽  
Gerald J. Meyer
Keyword(s):  
Rate Constants ◽  
Recombination Rate ◽  
Charge Recombination ◽  
Inner Sphere ◽  
Donor Acceptor

Time-resolved FTIR study of CO recombination with horseradish peroxidase

2008 ◽  
Vol 36 (6) ◽  
pp. 1165-1168 ◽  
Author(s):  
Amandine Maréchal ◽  
W. John Ingledew ◽  
Peter R. Rich
Keyword(s):  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Horseradish Peroxidase ◽  
Rate Constants ◽  
Recombination Rate ◽  
Thermal Equilibrium ◽  
Time Resolved ◽  
Fourier Transform Ir Spectroscopy ◽  
Rapid Scan ◽  
Fourier Transform Ir

Vibrational changes associated with CO recombination to ferrous horseradish peroxidase were investigated by rapid-scan FTIR (Fourier-transform IR) spectroscopy in the 1200–2200 cm−1 range. At pH 6.0, two conformers of bound CO are present that appear as negative bands at 1905 and 1934 cm−1 in photolysis spectra. Their recombination rate constants are identical, confirming that they arise from two substates of bound CO that are in rapid thermal equilibrium, rather than from heterogeneous protein sites. A smaller positive band at 2134 cm−1 also appears on photolysis and decays with the same rate constant, indicative of an intraprotein geminate site involved in recombination or, possibly, a weak-affinity surface CO-binding site. Other signals arising from protein and haem in the 1700–1200 cm−1 range can also be time-resolved with similar kinetics.

scholarly journals Concerted proton-electron transfer reactions in the Marcus inverted region

Science ◽  
2019 ◽  
Vol 364 (6439) ◽  
pp. 471-475 ◽  
Author(s):  
Giovanny A. Parada ◽  
Zachary K. Goldsmith ◽  
Scott Kolmar ◽  
Belinda Pettersson Rimgard ◽  
Brandon Q. Mercado ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Charge Recombination ◽  
Transfer Reactions ◽  
Inverted Region ◽  
Electron Transfer Reactions ◽  
Proton Coupled Electron Transfer ◽  
Marcus Inverted Region ◽  
A Charge ◽  
Theory Yield

Electron transfer reactions slow down when they become very thermodynamically favorable, a counterintuitive interplay of kinetics and thermodynamics termed the inverted region in Marcus theory. Here we report inverted region behavior for proton-coupled electron transfer (PCET). Photochemical studies of anthracene-phenol-pyridine triads give rate constants for PCET charge recombination that are slower for the more thermodynamically favorable reactions. Photoexcitation forms an anthracene excited state that undergoes PCET to create a charge-separated state. The rate constants for return charge recombination show an inverted dependence on the driving force upon changing pyridine substituents and the solvent. Calculations using vibronically nonadiabatic PCET theory yield rate constants for simultaneous tunneling of the electron and proton that account for the results.

Measurement of oxygen recombination rate constants by the piezoelectric method

1987 ◽  
Vol 53 (3) ◽  
pp. 1054-1057 ◽  
Author(s):  
I. E. Zabelinskii ◽  
O. P. Shatalov
Keyword(s):  
Rate Constants ◽  
Recombination Rate
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