Delocalization of Positive Charge in 蟺-Stacked Multi-benzene Rings in Multilayered Cyclophanes

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• 作者：Mamoru Fujitsuka ; Sachiko Tojo ; Masahiko Shibahara ; Motonori Watanabe ; Teruo Shinmyozu ; Tetsuro Majima
• 刊名：Journal of Physical Chemistry A
• 出版年：2011
• 出版时间：February 10, 2011
• 年：2011
• 卷：115
• 期：5
• 页码：741-746
• 全文大小：881K
• 年卷期：v.115,no.5(February 10, 2011)
• ISSN：1520-5215

文摘

In the present study, delocalization of a positive charge in 蟺-stacked multi-benzene rings in multilayered para- and meta-cyclophanes, in which benzene rings are connected by propyl chains to form a chromophore array with the face-to-face structure, was investigated by means of transient absorption spectroscopy during the pulse radiolysis using dichloroethane as a solvent. The local excitation and charge resonance (CR) bands were successfully observed. It was revealed that the CR band shifted to the longer wavelength side with the number of the benzene rings. The stabilization energy estimated from the peak position of the CR band showed the efficient charge delocalization over the cyclophanes. Furthermore, the CR bands showed the slight spectral change attributable to the change in distribution of the conformers. The substantially long lifetime of the CR band can be explained on the basis of the smaller charge distribution on the outer layers of the multilayered cyclophanes.