Photodynamics of a PV Trimer in High‐Viscosity Solvents and in PMMA Films: A New Insight into Energy Transfer versus Conformational Relaxation in Conjugated Polymers
1. Centro de Química Estrutural, Departamento de Engenharia Química e Biológica, Instituto Superior Técnico, Av. Rovisco Pais, s/n. Lisboa 1049‐001 (Portugal), Fax: (+351)?21?841?7246;2. Departamento de Química, Universidade de Coimbra, Coimbra (Portugal);3. Instituto de Telecomunica??es and Departamento de Engenharia Química e Biológica, Instituto Superior Técnico, Lisboa (Portugal)
Abstract:
Non‐Stokes–Einstein relaxation : The rate constant of conformational relaxation of a phenylenevinylene trimer (see picture) in different solvents is proportional to η?α, with α values decreasing from close to unity (low viscosity) to zero at sufficiently high solvent viscosity. This behaviour is attributed to the flexible methylbutyl side chains of the trimer, which partially screen the solvent friction.
