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Issue 19, 2004
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Switching of molecular second-order polarisability in solution

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Second-order nonlinear optical (NLO) polarisabilities or first hyperpolarisabilities, β, of molecules may be manipulated by reversibly modifying the properties of specific parts of active molecules, usually by on/off switching. This may involve reducing the donor capacity of the electron-rich fragment of a typical donor–acceptor species, D–A, by oxidation or protonation. Conversely, the acceptor behaviour of A may be altered by reduction, or by deprotonation. Alteration of the first hyperpolarisability may also involve structural or chemical modification of the bridging group, thereby interfering with the communication between D and A. Much of the article focuses on redox behaviour of NLO-active metal-containing compounds, mainly describing dipolar species in which the donor fragment containing a metal is oxidised, but giving examples of switching behaviour in octopolar species and of protonation/deprotonation behaviour.

Graphical abstract: Switching of molecular second-order polarisability in solution

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The article was received on 29 Jan 2004, accepted on 13 Jul 2004 and first published on 13 Aug 2004

Article type: Feature Article
DOI: 10.1039/B401434K
Citation: J. Mater. Chem., 2004,14, 2831-2839

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    Switching of molecular second-order polarisability in solution

    I. Asselberghs, K. Clays, A. Persoons, M. D. Ward and J. McCleverty, J. Mater. Chem., 2004, 14, 2831
    DOI: 10.1039/B401434K

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