Tunable conformation and stability of amidourea-based hydrogen-bonded heteroduplexes
摘要:
A class of multiply hydrogen-bonded heteroduplexes were constructed from readily available amidourea derivatives, and their structures and association stabilities were investigated. Although the amidourea derivatives possessed different spacers or termini, they could adjust their conformations to achieve an optimal binding module. Consequently, all the heteroduplexes adopted similar hydrogen-bonding patterns through eight intermolecular bifurcated hydrogen bonds based on the amidourea motif. Moreover, it was also found that the association stabilities of the heteroduplexes could be well tuned by varying the spacers or termini of the monomers. (C) 2012 Elsevier Ltd. All rights reserved.
在溶液和固态下,研究了通过四个分子间三中心氢键稳定的自互补阿米杜里亚基序。对低聚物2的广泛研究表明,基于amidourea基序,氢键合模式可以在更长的分子双链体中持续存在。通过1 H NMR稀释研究定量确定了各种DMSO- d 6 / CDCl 3混合物中2b·2b的二聚常数,这表明同双链体在低极性溶剂中高度稳定。