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Two anion complexes of a tripodal tris(ferrocenylurea) receptor (L), (LH)·CF3SO3 (1) and (LH)·HSO4 (2), were obtained from L and triflic acid or sulfuric acid, respectively. Crystal structural analyses show that the receptor in the two 1:1 (host/guest) complexes is protonated (on the bridgehead tertiary amine), and the CF3SO3– or HSO4– anion is located outside the tripodal cavity and anchored by the...
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