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New J. Chem., 2007, 31, 662 - 668, DOI: 10.1039/b615639h
Controlling the interplay of large organic ions: para-sulfonato-calix[4]arene and phosphonium cations
Mohamed Makha, Yatimah Alias, Colin L. Raston and Alexandre N. Sobolev
Materials based on polyanionic para-sulfonato-calix[4]arene and tetraphenylphosphonium (Ph4P+) or benzyltriphenylphosphonium (BzPh3P+) cations are built up via partial inclusion and extensive phenyl embracing in association with trivalent cations (Yb3+, Gd3+ and Er3+). The crystalline materials have layered structures and feature negatively-charged channels propagating through the solids.
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