Abstract
Conventional molecular wires of the oligophenyleneethynylene (OPE) type are two-dimensional rigid molecules of fixed length. Possible problems concerning π,π stacking and device geometry associated therewith might be overcome by replacement of some of the 1,4-phenylene moieties by 1,1′-disubstituted ferrocene units. These make the wire three-dimensional thereby reducing the likelihood of intermolecular π,π interactions and serve in addition as hinges as a result of the almost free rotation around the Cp-Fe-Cp axis. This feature provides a limited conformational flexibility with the possibility of a length adjustment comparable to a foldable ruler. Here the syntheses and some physical properties of molecular wires containing two ferrocene hinges are described. In a number of cases the Sonogashira coupling reactions used for the coupling of the respective building blocks proceed much faster under microwave irradiation as compared to conventional heating.
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Acknowledgements
This work was kindly supported by the Volkswagen Foundation and the Deutsche Forschungsgemeinschaft (SPP 1243). We thank Wacker Chemie AG for a donation of trimethylsilylethyne (7) and Octel Deutschland GmbH for a donation of ferrocene.
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This paper is dedicated to Professor Didier Astruc in honor of his pioneering research efforts and accomplishments in the field of organometallic materials.
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Ma, J., Vollmann, M., Menzel, H. et al. New Molecular Wires with Two Ferrocene Hinges. J Inorg Organomet Polym 18, 41–50 (2008). https://doi.org/10.1007/s10904-007-9189-1
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DOI: https://doi.org/10.1007/s10904-007-9189-1