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Issue 11, 2018
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Push–pull D–π-Ru–π-A chromophores: synthesis and electrochemical, photophysical and second-order nonlinear optical properties

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Abstract

The present work describes the one-pot synthesis and electrochemical, photophysical and second-order nonlinear optical (NLO) properties of a series of dipolar π-delocalized Ru(II) dialkynyl complexes. The eight new asymmetrical D–π-Ru–π-A push–pull chromophores incorporate pyranylidene ligands as pro-aromatic donor groups (D) and formaldehyde, indane-1,3-dione, pyrimidine or pyrimidinium as electron-attracting groups (A) separated by ruthenium bis-acetylide fragments and π-conjugated linkers. The second-order nonlinear optical (NLO) properties of all eight complexes were determined by the Electric-Field-Induced Second Harmonic generation (EFISH) technique (operating at 1907 nm), and were compared to those of their purely organic analogs. All investigated compounds (organic and organometallic) exhibited positive μβ values, which dramatically increased for the complexes due to the presence of ruthenium in the π-conjugated core. The second-order NLO response could also be easily modulated by changing the nature of alkynyl substituents. The most promising ruthenium complexes 7 and 8 of the series with the pyrimidinium fragment displayed μβ values of 14 000 × 10−48 esu. The effect of structural modifications on the redox and spectroscopic properties of the complexes was also studied. The intramolecular charge transfer (ICT) occurring through the ruthenium center of the push–pull σ-dialkynyl complexes was investigated by combining experimental and theoretical data.

Graphical abstract: Push–pull D–π-Ru–π-A chromophores: synthesis and electrochemical, photophysical and second-order nonlinear optical properties

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Publication details

The article was received on 09 Jan 2018, accepted on 05 Feb 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C8DT00093J
Citation: Dalton Trans., 2018,47, 3965-3975
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    Push–pull D–π-Ru–π-A chromophores: synthesis and electrochemical, photophysical and second-order nonlinear optical properties

    R. J. Durand, S. Gauthier, S. Achelle, T. Groizard, S. Kahlal, J. Saillard, A. Barsella, N. Le Poul and F. R. Le Guen, Dalton Trans., 2018, 47, 3965
    DOI: 10.1039/C8DT00093J

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