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Coordinating the Schiff base of a helicenecdicarbalde-hyde to nickel centers resulted in the first ladder polymer that has an unbroken network of double bonds winding in one direction along a helix (see the representation on the right). Helicene and nickel salophen units alternate in the product, on average 8.3 times.
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Dai et al. (1996) studied this question.
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