Abstract
The hexakis-urea is unexpectedly soluble due to intramolecular hydrogen bonding. The hexakis-urea recognizes four dihydrogen phosphate ions in the solid state. However, in solution, a complex with three dihydrogen phosphate ions is identified. The association proceeds in an amphoteric allosteric manner; in a positive allosteric manner (K1<K2) in the first step and a negative allosteric manner (K2>K3) in the subsequent step. More information can be found in the Communication by H. Takaya, M. Yamanaka, et al. on page 16201.
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