Spontaneous octupolar ordering in a dendrimer has been observed for highly nonlinear ruthenium complexes. Various oligomers containing N ruthenium-tris-bipyridine monomers have been synthesized and characterized. The quadratic nonlinear properties of supramolecular dendritic or predendritic structures are reported for N = 2, 3, and 7. The Figure shows a trimetallic metallo-polyimide chromophore.
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Bozec et al. (2001) studied this question.
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