Cucurbit[7]uril complexations of Good's buffers?
RSC Advances Pub Date: 2017-09-01 DOI: 10.1039/C7RA08865E
Abstract
The cucurbit[7]uril (CB[7]) host–guest complexations of a series of zwitterionic “Good's” biological pH buffers have been investigated in aqueous solution by means of 1H NMR spectroscopy. The cyclohexylammonium buffers bind very strongly (KCB[7] = 107 to 108 dm3 mol?1), while the morpholinium (102 to 103 dm3 mol?1) and piperazinium (103 to 104 dm3 mol?1) buffers have binding constants several orders of magnitude smaller. The binding constants increase as the distance between the ammonium and sulfonate groups increases. The pKa of 2-(cyclohexylammonio)ethanesulfonate (CHES) increases by 3.1 units upon complexation by CB[7].
![Graphical abstract: Cucurbit[7]uril complexations of Good's buffers](http://scimg.chem960.com/usr/1/C7RA08865E.jpg)
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Journal Name：RSC Advances
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