Quinoidal hoop-shaped macrocycles: Raman spectra of cycloparaphenylenes of different sizes are measured and compared with those of linear oligoparaphenylenes and theoretical calculations. In the cases of cycloparaphenylenes, peak positions of CC/CC stretches significantly depend on the size of the oligomer (see picture), indicating an enhancement of the quinoidal character of smaller cycloparaphenylenes.
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