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Dr. Mamoru Fujitsuka, Takahiro Iwamoto, Dr. Eiichi Kayahara, Prof. Shigeru Yamago and Prof. Tetsuro Majima Enhancement of the Quinoidal Character for Smaller [n]Cycloparaphenylenes Probed by Raman Spectroscopy ChemPhysChem 14

Article first published online: 20 MAR 2013 | DOI: 10.1002/cphc.201300144

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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 C[DOUBLE BOND]C/C[BOND]C 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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