cg901354x_si_005.cif (75.54 kB)

p-Sulfonatocalix[4]arene−Pyrrolidinium Complexation in Building Multicomponent Layered Arrays

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posted on 03.03.2010, 00:00 by Irene Ling, Yatimah Alias, Alexandre N. Sobolev, Colin L. Raston
p-Sulfonatocalix[4]arene and monophosphonium ions, in the presence of N-butyl-N-methylpyrrolidinium ions and aquated lanthanide ions, assemble into bilayers comprised of calixarenes with the phosphonium cations embedded between them; pyrrolidinium ions reside in the calixarene cavities which are normal to the bilayer plane. Replacing the phosphonium cations with bis-phosphonium ions results in the same interplay of the calixarene and pyrrolidinium cations, but with the formation of a different layered structure, which is now devoid of lanthanide ions, unlike the other bilayers, with all the sulfonate groups of the calixarenes residing in a plane with adjacent calixarenes in alternating directions. In aqueous solutions, a 1:1 supermolecule of the calixarene and pyrrolidinium ion is evident in aqueous solution using 1H NMR spectroscopy.