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Cucurbituril is used as the molecular “bead” for the synthesis of the first three-dimensional polyrotaxane network, which shows an inclined α-polonium topology. The novel solid-state interlocked structure is made up of binulcear Tb3+ centers and pseudorotaxane units containing cucurbituril “beads” threaded on a “string” with 3-phenylcarboxylate terminals (shown schematically).
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Lee et al. (2000) studied this question.
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