title: Spectroscopic investigation of the ultrafast photoinduced dynamics in pi-conjugated terpyridines.
abstract: Ultrafast light-induced processes in a series of pi-conjugated mono-, bis-, tris- and tetrakis(terpyridine) derivatives are investigated by femtosecond time-resolved spectroscopy. Non-exponential excited-state dynamics involving singlet-triplet intersystem crossing are observed which span from picoseconds to nanoseconds (see figure). Time-resolved spectroscopy is applied to investigate the ultrafast relaxation dynamics of several pi-conjugated mono-, bis-, tris- and tetrakis(terpyridine) derivatives. This particular series of structurally closely related systems was prepared applying efficient synthetic strategies and resembles key building blocks for a wide range of photoactive complexes, dendrimers and metallo-polymers with resulting potential applications, for example, in photovoltaics or as organic light-emitting diodes. Aiming for applications of supramolecular assemblies based on these recently presented terpyridine ligands a detailed knowledge of the light-induced processes of the ligands themselves represents a prerequisite. By applying femtosecond time-resolved absorption spectroscopy in concert with time-resolved fluorescence and Raman measurements, we detail the photophysical properties.
authors.affiliation: Institute for Physical Chemistry, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany.
authors.forename: Ronald
authors.initials: R
authors.lastname: Siebert
authors.forename: Denis
authors.initials: D
authors.lastname: Akimov
authors.forename: Michael
authors.initials: M
authors.lastname: Schmitt
authors.forename: Andreas
authors.initials: A
authors.lastname: Winter
authors.forename: Ulrich S
authors.initials: US
authors.lastname: Schubert
authors.forename: Benjamin
authors.initials: B
authors.lastname: Dietzek
authors.forename: Jürgen
authors.initials: J
authors.lastname: Popp