化学
离域电子
拉曼光谱
激进的
自由基离子
光化学
部分
芳香性
亚甲基
共振(粒子物理)
债券定单
结晶学
粘结长度
立体化学
离子
药物化学
晶体结构
有机化学
分子
物理
光学
粒子物理学
作者
D. J. Barker,Ralph P. Cooney,L. A. Summers
标识
DOI:10.1002/jrs.1250160409
摘要
Abstract Raman spectra are reported for several bridged diquaternary salts of 2,2′‐bipyridine. Resonance Raman spectra and some excitation profiles of the coloured radical monocations obtained from the diquaternary salts by one‐electron reduction are also reported. Selected frequencies of the parent dications are correlated with changes in the torsional angle between the aromatic rings of the bipyridinium moiety. These correlations, when applied to the spectra of the radical monocations, suggest that the radicals exhibit reduced torsional angle and increased inter‐ring bond order, compared with the parent dications. These changes are consistent with predictions of increased inter‐ring π‐electron delocalization, associated with radical formation. The torsional angle appears to decrease for the radical monocations with increasing number of bridging methylene groups. This is opposite to the trend known to occur in the parent dications.
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