Determination of the Purity of Cucurbit[n]uril (n = 7, 8) Host Samples

Angel E. Kaifer & Song Yi
The formation of highly stable inclusion complexes in aqueous solution between the organometallic cobaltocenium cation (Cob+) and the hosts cucurbit[7]uril (CB7) and cucurbit[8]uril (CB8) was used to develop a simple method, based on UV–vis titrations, to assay the purity of samples of these two hosts. The equilibrium association constant (K) of the Cob+@CB7 complex had been previously reported by our group as 5.7 × 109 M–1 at 25 °C in 50 mM sodium acetate medium....
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