title: Rodlike macromolecules through spatial overlapping of thiophene dendrons.
abstract: Two novel dendritic macromonomers 7 and 8 functionalized with electroactive conjugated thiophene oligomers were synthesized by stepwise cross-coupling reactions and the introduction of a vinyl group at the focal point. Both macromonomers were polymerized into dendronized polymers 9 and 10 by using a radical polymerization method. The photophysical and redox behaviors of dendronized polymers 9 and 10 are significantly different from those of the corresponding macromonomers. This difference may result from the spatial overlapping of thiophene dendrons through π-π interactions when the dendrons are connected to a polymer backbone. The dendronized polymers can organize into large-area two-dimensional sheets with a thickness of 4.8 nm. Polymer 9, which has all-dendritic thiophene side chains, exhibited enhanced conductivity by partial doping with iodine or nitrosonium tetrafluoroborate (NOBF(4)). The novel amphiphilic dendronized polymer 15 was synthesized by the atom-transfer radical polymerization of macromonomer 7 from a poly(ethylene glycol) (PEG) macroinitiator and was found to have a self-organized structure in water.
authors.affiliation: Department of Functional Polymer Science, Faculty of Textile Science and Technology, Shinshu University, Ueda, Japan. mkimura@shinshu-u.ac.jp
authors.forename: Mutsumi
authors.initials: M
authors.lastname: Kimura
authors.forename: Akiko
authors.initials: A
authors.lastname: Kitao
authors.forename: Tadashi
authors.initials: T
authors.lastname: Fukawa
authors.forename: Hirofusa
authors.initials: H
authors.lastname: Shirai