The electronic structure of helicene-bisquinone anion radicals
The electronic structure of helicene-bisquinone anion radicals
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螺烯-双醌阴离子自由基的电子结构
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
Longbin Liu
中科院分区：
文献类型：
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作者：
C. Liberko;L. Miller;T. J. Katz;Longbin Liu
用循环伏安法研究了5、6、7、8环螺旋烯双醌类化合物，用可见光、近红外和ESR光谱研究了其电化学制备的阴离子自由基。还原电位之间的大分离，非常长的波长下的明确吸收，以及ESR光谱中与温度无关的超细分裂都表明，与线性类似物不同，螺旋双醌阴离子自由基具有离域电子结构。购买力平价半经验计算正确地解释了这些实验观察结果
Helicene-bisquinones with five, six, seven, and eight rings were studied by cyclic voltammetry, and their anion radicals, prepared electrochemically, were studied by visible, near-IR, and ESR spectroscopy. The large separation between reduction potentials, the well-defined absorptions at very long wavelengths, and hyperfine splittings in the ESR spectra that are independent of temperature all imply that unlike linear analogs, the helical bisquinone anion radicals have delocalized electronic structurs. PPP semiempirical calculations correctly account for these experimental observations