Excited-state dynamics of a hemicyanine dye in polymer blends

Abstract

The twisting motion of trans-4-[4-(dimethylamino)-styryl]-1-methylpyridinium iodide (4-DASPI) is studied in rigid environments. The elastic modulus of the medium is found to play a key role in the molecular rotor dynamics. The picture shows the isomerization rate constant of 4-DASPI as a function of the Young modulus of polystyrene/1-octene copolymer (PS/EOC) blends. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.