F. Liu, X. Zhu
SHORT COMMUNICATION
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Experimental Section
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General: All operations were carried in the at 298 K under strict
anaerobic conditions in dry CH3CN. The kinetics of the hydride
transfer reactions were conveniently monitored with an Applied
Photophysics SX.18MV-R stopped-flow and under first order con-
ditions with the concentration of the hydride donor in at least ten
fold excess of that of the hydride acceptor. The rates for the forma-
tion of the product were determined from appearance of the ab-
sorbance due to the hydride transfer product (X) at λ = 370 nm.
The rates for the consumption of the reactants were determined
from disappearance of the absorbance due to the hydride transfer
reactants (9-GPhXn+) (Herein, for G = p-CH3O, λ = 497 nm; for
G = p-H, λ = 449 nm, and so on). The titration experiments were
performed on a CSC4200 isothermal titration calorimeter. The
electrochemical experiments were carried out by cyclic voltammetry
(CV) and Osteryoung square-wave voltammetry (OSWV) using a
BAS-100B electrochemical apparatus.
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compounds and measurement of the redox potentials, isothermal
titration calorimetry, kinetic measurements, and three thermo-
dynamic cycles.
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transfer processes. The validation of using the free energy
change ΔGeT instead of the enthalpy change ΔHeT for electron-
transfer processes is that entropies associated with electron
transfer are negligible and ΔGeT can be combined directly with
ΔHeT, which was verified by Arnett’s work, see: E. M. Arnett,
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Acknowledgments
Financial support from the National Natural Science Foundation
of China (NSFC) (grant numbers 21072104, 20921120403,
20832004, and 21102074) and the Ministry of Science and Technol-
ogy of China (grant number 2004CB719905) is gratefully acknowl-
edged.
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Received: August 1, 2014
Published Online: October 15, 2014
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