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Title: Azulenylium and guaiazulenylium cations as novel accepting moieties in extended sesquifulvalene type D-pi-A NLO chromophores
Authors: Farrell, T ×
Meyer-Friedrichsen, T
Malessa, M
Haase, D
Saak, W
Asselberghs, Inge
Wostyn, Kurt
Clays, Koen
Persoons, Andre
Heck, J
Manning, AR #
Issue Date: Jan-2001
Publisher: Royal soc chemistry
Series Title: Journal of the chemical society-dalton transactions issue:1 pages:29-36
Abstract: The novel series of monometallic monocations Fc-[n]-Az(+) and Fc-[n]-Guaz(+) (where Az(+) and Guaz(+) denote azulenylium and guaiazulenylium cations respectively and n=0-3), and a bimetallic dicationic complex Fc-[0]-Guaz(RuCp)(2+) have been prepared. Single crystal structures of Fc-[0]-Guaz(+) and Fc-[0]-Guaz(RuCp)(2+) have been determined. Analysis of the bond lengths and angles coupled with the electrochemistry data provides evidence for strong ground state charge transfer in the series which diminishes upon pi -bridge extension. The electronic absorption spectra reveal that alkylation of the cationic terminus (1) diminishes the electron-accepting ability, (2) results in a larger dipole moment change upon excitation and (3) causes a smaller sequential lowering of the CT transitions with pi -bridge extension. The NLO properties which were characterised by hyper-Rayleigh scattering techniques indicate the potential of the azulenylium based donor-acceptor chromophores, but also that the extended complexes exhibit two-photon absorption fluorescence.
ISSN: 1472-7773
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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