J. Kankare, J. Lukkari, P. Pasanen
Jul 1, 1994
Citations
0
Influential Citations
18
Citations
Journal
Macromolecules
Abstract
The coplanarity of 2,2':5',2''-terthiophene and its six 3'-substituted derivatives, namely 3'-phenyl- (13), 3'-(4-methoxyphenyl)- (14), 3'-(2-cyanophenyl)- (16), 3'-(2-thienyl)- (16), 3'-(5-methyl-2-thienyl)-(17), and 3'-(4-pyridyl)-2,2':5',2''-terthiophene (18), has been studied by UV spectroscopy and compounds 13 and 17 have also been studied by X-ray diffractometry. For comparison, also an isomer of compound 13, 2'-phenyl-2,3':5',2''-terthiophene (20), was synthesized and its structure determined by XRD. The UV spectra reveal that the aromatic and heteroaromatic substituents do not appreciably conjugate with the terthiophene backbone