title: Unusual photopolymerization behavior of amino Acid-derived polydiacetylene supramolecules.
abstract: UV-irradiation of aqueous suspensions of amino acid-derived amphiphilic diacetylene supramolecules promotes a process that involves initial formation of species that absorb at 640 nm followed by the generation of polymers that have longer wavelength (686 nm) absorbance. The initially formed intermediate polydiacetylenes display substantial colorimetric reversibility while the long wavelength absorbing polymers show irreversible thermochromism during heating and cooling cycles. The long wavelength absorbing polydiacetylenes, formed from amino acid-derived amphiphilic diacetylene supramolecules, are suggested to have more planer backbone structures that allow more efficient overlap of the conjugated p-orbitals.
authors.affiliation: Department of Chemical Engineering, Hanyang University, Seoul 133-791, Korea.
authors.forename: Jaewon
authors.initials: J
authors.lastname: Yoon
authors.forename: Kamalrul Azlan Bin
authors.initials: KA
authors.lastname: Azizan
authors.forename: Hyun Oh
authors.initials: HO
authors.lastname: Yoo
authors.forename: Shuji
authors.initials: S
authors.lastname: Okada
authors.forename: Jong-Man
authors.initials: JM
authors.lastname: Kim