Requirement for Hydrogen-Bonding Cooperativity in Small Polyamides: A Combined VT-NMR and VT-IR Investigation
作者:Benjamin W. Gung、Zhaohai Zhu、Dong Zou、Brian Everingham、Agozie Oyeamalu、Rachael M. Crist、Joseph Baudlier
DOI:10.1021/jo971831z
日期:1998.8.1
bond strength for the terminal NH (DeltaH = -3.1 +/- 0.5 kcal/mol) and for the internal NH (DeltaH = -2.8 +/- 0.5 kcal/mol). The increased hydrogen bond strength is taken as evidence for hydrogen-bondingcooperativity from the two mutually enhanced individual hydrogen bonds. A near linear NH--O bond angle is required for this effect.