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meta ‐Phenylene Units as Conjugation Barriers in Phenylenevinylene Chains
Author(s) -
Gregorius Heike,
Baumgarten Martin,
Renter Ronald,
Müllen Klaus,
Tyutyulkov Nikolai
Publication year - 1992
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199216531
Subject(s) - phenylene , ionic bonding , photochemistry , redox , ion , chemistry , polymer chemistry , materials science , polymer , inorganic chemistry , organic chemistry
Independent of the chain length are the optical and redox chemical properties of the oligomers 1 , because the formally continuous π conjugation in them is interrupted by the meta ‐phenylene units. This is valid for neutral as well as for ionic systems. The charge localization on a stilbene unit causes extremely long wavelength “intervalence” bands in the UV/VIS spectra of the radical ions of these compounds.