A kind of supramolecular building unit

2

6-di[N-(carboxyethyl carbonyl)amino]pyridine(defined as DAP)was synthesized from 2

6-diaminopyridine and succinic anhydride by a simple procedure．The structure of DAP was confirmed by 1H—NMR

IR and elemental analysis．Supramolecular hydrogels were formed during the cooling of DAP aqueous solutions at a concentration range of 3 wt％～10 wt％．As observed by scanning electron micrescopy

supramolecular fibers were noticed in the bytes and their dimensions can be regulated by the concentration of DAP．At higher concentrations of DAP

larger fibers and lower hydrogel strengths were resulted．Based on the formation of hydrogen bonds of the molecules an assembling process for supramolecular hydrogels was proposed．