Author Archives: Michaela

The role of C-H and C-C stretching modes in the intrinsic non-radiative decay of triplet states in a Pt-containing conjugated phenylene ethynylene

  Anna Köhler, Amena L. T. Khan, Joanne S. Wilson, Carsten Dosche, Mohammed K. Al-Suti et al. J. Chem. Phys. 136 (2012) 094905 [DOI][PDF] The intrinsic non-radiative decay (internal conversion) from the triplet excited state in phosphorescent dyes can be described by a multi-phonon emission process. Since non-radiative decay of triplet excitons can be a […]

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Synthesis and characterization of platinum (II) di-ynes and poly-ynes incorporating ethylenedioxythiophene (EDOT) spacers in the backbone

  Muhammad S. Khan, Mohammed K. Al-Suti, Hakkikulla H. Shah, Said Al-Humaimi, Fathiya R. Al-Battashi, Jens K. Bjernemose, Louise Male, Paul R. Raithby, Ning Zhang, Anna Köhler and John E. Warrend Dalton Tans., 40 (2011) 10174 [DOI][PDF] A series of trimethylsilyl-protected di-alkynes incorporating 3,4-ethylenedioxythiophene (EDOT) linker groups Me3Si–C C–R–C C–SiMe3 (R = ethylenedioxythiophene-3,4-diyl 1a, 2,2¢-bis-3,4- […]

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The effect of delocalization on the exchange energy in meta- and para-linked Pt-containing carbazole polymers and monomers

  Ning Zhang, Anna Hayer, Mohammed K. Al-Suti, Rayya A. Al-Belushi, Muhammad S. Khan, and Anna Köhler J. Chem. Phys. 124 (2006) 244701 [DOI][PDF] A series of novel platinum-containing carbazole monomers and polymers was synthesized and fully characterized by UV-VIS absorption, luminescence, and photoinduced absorption studies. In these compounds, a carbazole unit is incorporated into […]

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Triplet Energy Back Transfer in Conjugated Polymers with Pendant Phosphorescent Iridium Complexes

  Nicholas R. Evans, Lekshmi Sudha Devi, Chris S. K. Mak, Scott E. Watkins, Sofia I. Pascu, Anna Köhler, Richard H. Friend, Charlotte K. Williams and Andrew B. Holmes J. Am. Chem. Soc. 128 (2006) 6647-6656 [DOI][PDF] Abstract: The nature of Dexter triplet energy transfer between bonded systems of a red phosphorescent iridium complex 13 […]

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Highly Fluorescent Crystalline and Liquid Crystalline Columnar Phases of Pyrene-Based Structures

  Anna Hayer, Véronique de Halleux, Anna Ko1hler, Abdel El-Garoughy, E. W. Meijer, Joaquín Barberá, Julien Tant, Jeremy Levin, Matthias Lehmann, Johannes Gierschner, Jérôme Cornil, and Yves Henri Geerts J. Phys. Chem. B 110 (2006) , 7653-7659 [DOI][PDF] A concept for highly ordered solid-state structures with bright fluorescence is proposed: liquid crystals based on tetraethynylpyrene […]

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