NMR spectroscopy was used to show that the symmetry of the crown ether bis(C6) is increased by an increase of the alkali metal cation radius. The EXAFS spectrum demonstrates that a seven oxygen atom coordinated configuration is present in the bis(C6)/Cs+/NPME system, where NPME denotes o-nitrophenylmethyl ether. The seventh oxygen in this complex, besides the six crown ether oxygens of bis(C6), may come either from a H2O molecule or an NO3− ion.
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Gao, J.X., Wang, J.C., Song, C.L. et al. Bis(crown-6)calix[4]arene/Cs+ Coordination Chemistry in NPME Solution. J Solution Chem 35, 113–119 (2006). https://doi.org/10.1007/s10953-006-8943-2
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DOI: https://doi.org/10.1007/s10953-006-8943-2