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Four oxygen atoms and a double bond, coordinate to the Ag+ ion in the complex with the stilbene crown ether 1. Surprisingly, the Na+ ion is also complexed by 1 in a similar geometry. The coordinative bond between a Na+ ion and a π bond, which is detected here for the first time, is probably induced and supported by the oligo(ethylenoxy)oxy bridge. M+X− AgNO3, NaClO4.
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Futterer et al. (1997) studied this question.
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