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Enhancement of the Quinoidal Character for Smaller [ n ]Cycloparaphenylenes Probed by Raman Spectroscopy
Author(s) -
Fujitsuka Mamoru,
Iwamoto Takahiro,
Kayahara Eiichi,
Yamago Shigeru,
Majima Tetsuro
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201300144
Subject(s) - raman spectroscopy , character (mathematics) , oligomer , chemistry , spectroscopy , crystallography , computer science , information retrieval , polymer science , analytical chemistry (journal) , chemical physics , physics , mathematics , optics , organic chemistry , quantum mechanics , geometry
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.