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Reaction of equimolar amounts of sodium para-sulfonato-calix[4]arene, tetraphenylphosphonium chloride and ytterbium chloride in water results in the formation of a mineral clay-like structure, where the hydrophobic tetraphenylphosphonium cations interpose a bilayer arrangement based on a 2D coordination polymer of (calix[4]arene)5-/Na+/Yb3+.
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Makha et al. (2005) studied this question.
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