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Large second-order optical polarizabilities in mixed-valency metal complexes

Nature volume 363, pages 58–60 (1993)Cite this article

Abstract

THE potential development of optoelectronic devices based on the nonlinear polarization of molecular materials has aroused much recent interest1,2. The search for large second-order electric susceptibilities (that is, proportional to the square of an applied electric field) has concentrated on acentric organic or organometallic chromophores with an organic π-electron system coupling electron donor and acceptor groups3–6. It is conceivable that mixed-valence compounds characterized by an intervalence charge-transfer (IVCT) transition7, in which the donor and acceptor centres are both metal atoms, might also have the potential to provide a large second-order response8, but this possibility has not been widely explored. Here we report the first hyperpolarizability, β, of a bimetallic complex ion, [(CN)5Ru-μCN-Ru(NH3)5]- (I in Fig. 1), and a novel organometallic analogue, [(η5-C5H5)Ru(PPh3)2-μ-CN-Ru(NH3)5]3+ (II). Measurements of β (which is related to the bulk second-order response) in solution at a wavelength of 1,064 nm using the newly developed hyper-Rayleigh scattering technique9,10 give values greater than 10–27 e.s.u., which are among the largest reported for solution species. The ease with which the energy of the IVCT transition can be modified suggests that there may be considerable potential for this class of chromophore in nonlinear optical devices.

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Author notes

  1. R. G. Denning: To whom correspondence should be addressed.

Authors and Affiliations

  1. Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK

    W. M. Laidlaw & R. G. Denning

  2. Laboratory of Chemical and Biological Dynamics, University of Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium

    T. Verbiest, E. Chauchard & A. Persoons

Authors
  1. W. M. Laidlaw
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  2. R. G. Denning
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  3. T. Verbiest
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  4. E. Chauchard
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  5. A. Persoons
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Laidlaw, W., Denning, R., Verbiest, T. et al. Large second-order optical polarizabilities in mixed-valency metal complexes. Nature 363, 58–60 (1993). https://doi.org/10.1038/363058a0

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