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DOI:
https://doi.org/10.34804/supra.20210928197 Cc Cc by 4.0
Title:
Determination of the Purity of Cucurbit[n]uril (n = 7, 8) Host Samples
https://pubs.acs.org/na101/home/literatum/publisher/achs/journals/content/joceah/2011/joceah.2011.76.issue-24/jo2018312/production/images/large/jo-2011-018312_0002.jpeg
Description:
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. In this work, we determine a K value of 1.9 × 108 M–1 at 25 °C in the same medium for the Cob+@CB8 complex. The high stability of these complexes and their decreased molar absorptivity coefficients (at 261 nm), compared to that for free Cob+, lead to straightforward titration plots when graphing absorbance versus concentration of added CB7 (or CB8) host, at constant Cob+ concentration.
Citation:

A. E. Kaifer, S. Yi, SupraBank 2024, Determination of the Purity of Cucurbit[n]uril (n = 7, 8) Host Samples (dataset). https://doi.org/10.34804/supra.20210928197

Link: https://doi.org/10.34804/supra.20210928197
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Citation:

S. Yi, A. E. Kaifer, J. Org. Chem. 2011, 76, 10275–10278.

Link: https://doi.org/10.1021/jo2018312
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Creators:
Orcidid | Ror | Song Yi
Orcidid | Ror | Angel E. Kaifer
Contributers:
Orcidid | Ror | Laura Grimm | DataManager

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