@article{StrehmelSarkerLahtietal.2005,
  author    = {Strehmel, Veronika and Sarker, A. M. and Lahti, P. M. and Karasz, F. E. and Heydenreich, Matthias and Wetzel, Hendrik and Haebel, Sophie and Strehmel, Bernd},
  title     = {One- and two-photon photochemistry and photophysics of poly(arylenevinylene)s containing a biphenyl moiety},
  issn      = {1439-4235},
  year      = {2005},
  abstract  = {Photochemical and photophysical properties were investigated for poly(arylenevinylene)s containing a flexible biphenyl "hinge" unit by applying one-photon (OP) and two-photon (TP) excitation to explore excited-state properties. The poly(arylenevinylene)s were poly[(2,5-dihexyloxy-p-phenylenevinylene)-alt-(4,4'-dihexyloxy-3,3'-biph enylenevinylene)] (1), poly[(2,5-dihexyloxy-p-phenylenevinylene)-alt-(2,2'-dihexyloxy-3,3'-biph enylenevinylene)] (2), and poly[(2,5-dihexyloxy-p-phenylenevinylene)-alt-(2,2'-biphenylene-vinylene )] (3). Effective emission quantum yields and related photonic properties were evaluated on a realistic per-chromophore basis using effective conjugation lengths based on the Strickler-Berg relationship. intramolecular photocyclization was deduced to occur in the one case where the biphenyl molecular connectivity permitted the reaction, based on matrix- assisted loser desorption/ionization time-of-flight (MALDI-TOF), heteronuclear multiple-quantum coherence (HMQC)-NMR, and gel-permeation chromatography (GPC) results. The various photoprocesses could be induced by either OP or TP excitation, though the first excited singlet state is the photoactive state. The higher excitation energy 1 of the TP excited state favors indirect population of the S, state by electronic coupling between the TP and OP excited states [lambda(max)(TPE) (nm): 726; delta (GM)([9]): 1 = 229, 2 = 215, 3 = 109). Photochemical processes occurring from the lowest OP excited state (S-1) could therefore also be indirectly induced by TP excitation},
  language  = {en}
}
@article{StrehmelSarkerLahtietal.2004,
  author    = {Strehmel, Veronika and Sarker, A. M. and Lahti, P. M. and Karasz, F. E. and Strehmel, Bernd},
  title     = {One and two-photon optical properties of ionic block copolymers with phenylenediethylenebispyridinium- chromophores},
  issn      = {0065-7727},
  year      = {2004},
  language  = {en}
}
@article{StrehmelHenbestSarkeretal.2001,
  author    = {Strehmel, Bernd and Henbest, K. B. and Sarker, A. M. and Malpert, J. H. and Chen, D. Y. and Rodgers, M. A. J. and Neckers, D. C.},
  title     = {Ion induced man ipulation of photochemical pathways in crown ether compounends based on fluorinated oligophenylenevinylenes},
  publisher = {Journal of nanoscience and nanotechnology. - 1 (2001), 1, S. 107 - 124},
  year      = {2001},
  language  = {en}
}