Transannular distance dependence of stabilization energy of the intramolecular dimer radical cation of cyclophanes.
The intramolecular dimer radical cation and charge-transfer complex of various cyclophanes were investigated by using pulse radiolysis measurements. The charge resonance band due to the dimer radical cation of cyclophanes appeared in the near-IR region, which showed a blue-shift as the distance between the two benzene rings of cyclophane decreased. The stabilization energy of the dimer radical cation, which was estimated from the peak position of the charge resonance band, was explained by the exchange interaction, while the substituent effect was small. The absorption peak of the charge-transfer complex with chlorine atom also showed the shift in accordance with the oxidation potential of cyclophanes.
Fujitsuka
Mamoru
M
The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Ibaraki, Japan.
Cho
Dae Won
DW
Tojo
Sachiko
S
Yamashiro
Satoko
S
Shinmyozu
Teruo
T
Majima
Tetsuro
T
D002412:Cations / Q000737:chemistry; D019281:Dimerization; D004735:Energy Transfer; D005609:Free Radicals / Q000737:chemistry; D006838:Hydrocarbons / Q000737:chemistry*; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D047028:Macrocyclic Compounds / Q000737:chemistry*; D008968:Molecular Conformation; D011675:Pulse Radiolysis; D013053:Spectrophotometry
D002412:Cations; D005609:Free Radicals; D006838:Hydrocarbons; D006845:Hydrocarbons, Fluorinated; D047028:Macrocyclic Compounds