Study on Oxalamide Hydrogen Bonding Motifs with Varying End Groups

摘要

Highly ordered polymeric structures having hydrogen bonding, as secondary interactions, are well known in nature. A good example is Deoxyribonucleic acid (DNA), formed by two polynucleotide chains.1 Here, two polynucleotide chains form a right-handed double helix by intra-chain hydrogen bonds between complementary base pairs. Another example of naturally occurring polymer where hydrogen bonding leads to ordered structure and ultimate performance is spider silk. Within the spider gland (a spinneret) various parameters such as, presence of ions and their interactions with amide units etc define the ultimate peptide structure, resulting into an anti-parallel sheet structure. In natural hydrogen bonded polymers, ordered structure formation is achieved in the presence of ion-water interactions. In the case of synthetic hydrogen bonded polymers such as polyamides, the potential use of water as a green solvent for processing is hardly exploited.