Biscrown stilbene S forms complexes of 1:1 and 2:1 composition with bisammonium viologen salt V 4+ in acetonitrile solution. Both of the complexes exhibit spectroscopic behavior typical of molecular electron donor−acceptor complexes. The 1:1 complex [ S · V ] 4+ has a very high thermodynamic stability (log K = 9.08), which is due to simultaneous interaction of the two ammonium groups of V 4+ with the two 18-crown-6-ether units of S . The 2:1 complex (log K = 12.28) [ S · V · S ] 4+ likely has a sandwich-type layered structure in which the acceptor salt is located between two complexed molecules of the biscrown stilbene.
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Ushakov et al. (2001) studied this question.
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