27837-62-3Relevant academic research and scientific papers
On the nature of solvent effects on redox properties
Svith, Heidi,Jensen, Henrik,Almstedt, Johan,Andersson, Paula,Lundbaeck, Thomas,Daasbjerg, Kim,Jonsson, Mats
, p. 4805 - 4811 (2004)
The one-electron reduction potentials of six radical cations, four cations, and four neutral radicals in tetrahydrofuran, dichloromethane, dimethyl sulfoxide, N-methyl-2-pyrrolidinone, N,N-dimethylformamide, acetonitrile, methanol, ethanol, 2-propanol, acetone, formamide, and 1,1,1,3,3,3-hexafluoropropan-2-ol were measured by cyclic voltammetry. For 10 of the redox couples, the redox process was reversible in all solvents. The results were used to evaluate solvent effects using Kamlet-Taft relationship. The entropy contribution to some of the observed solvent effects were examined by measuring the redox potentials as a function of temperature. The absolute value of the entropy increased with increasing hydrogen bond donor ability of the solvent. The variation in entropy indicated that specific solvation was very important when considering solvent effects on redox characteristics.
Free Radicals Produced from the Derivatives of Pyrylium Salts in Solution by Photoillumination
Niizuma, Shigeya,Sato, Nobuyoshi,Kawata, Hiroki,Suzuki, Yoshizo,Toda, Takashi,Kokubun, Hiroshi
, p. 2600 - 2607 (2007/10/02)
The photoreactions of 2,4,6-triphenyl- (TPP), 2-t-butyl-4,6-diphenylpyrylium (2BDPP) and 2,4,6-triphenylthiopyrylium (TPTP) salts in tetrahydrofuran (THF) and/or 1,2-dimethoxyethane were investigated.Photoproducts were identified to be pyranyl radicals on the basis of photochemical behavior and ESR spectra.Quantum yields of one-electron reduction of TPP, 2BDPP, and TPTP were obtained to be 0.21, 0.047, and 0.53, respectively.The hf coupling constants of protons in the radicals were determined by simulation.The photoillumination of TPP in THF at low temperatures revealed that a certain intermediate radical species was involved in this one-electron photoreduction.
