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The new 18-membered macrocyclic ligand 1,5(2,6)dipyridina-3,7(1,4)dipiperazinaoctacyclophane, † shows an allosteric effect upon complexation with copper(I) chloride in aqueous ethanol resulting in an extraordinary copper complex, the structure of which has been established by X-ray diffraction analysis.
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Rissanen et al. (1994) studied this question.
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