| abstract |
Thienothiophenes compositions comprising a C 3-8 secondary or tertiary alkyl group are disclosed. The thienothiophenes may berepresented by the formula: nwhere R is C 3-8 secondary or tertiary alkyl, e.g., isopropyl, tert -butyl, tert -pentyl, isopentyl, and 2-ethylhexyl, X and X' are independently selected from the group consisting of H, halogen atoms (e.g., F, Cl, Br, and I), MgCl, MgBr, Mgl, Sn(R') 3 , (where R' is C 1-6 alkyl or -OC 1-6 alkyl), boronic acid, boronic ester, -CH=CHR" (where R" is H or C 1-6 alkyl), -OC 1-6 alkyl, -COOC 1-6 alkyl, -S-COR''', -COR''' (where R''' is H or C 1-6 alkyl), -C¡CH, and polymerizable aromatic rings such as phenyl, naphthalene, pyrrole, dithiophene, thienothiophene, thiophene and so forth. |