Synthesis 13C NMR, λmax and MMP2 calculations of two ‘tailor-made’ α-conjugated hexamethylsexithiophenes.
作者:Giovanna Barbarella、Alessandro Bongini、Massimo Zambianchi
DOI:10.1016/s0040-4020(01)80015-6
日期:1992.1
3, 3', 4", 3''', 4'''', 3''''' - and 4, 4', 3", 4"', 3'''', 4''''' - hexamethyl 2, 2': 5', 2'': 5'', 2''': 5''', 2'''': 5'''', 2''''' sexithiophenes (I and II) have been prepared by nickel-phosphine catalyzed Grignard coupling and their conformational properties investigated with the aid of C-13 NMR spectra and MMP2 force field calculations. Owing to the presence of the substituents, the molecular skeletons are not planar and large blue shifts of the lambda(max) are observed.