A branched gelator synthesized from 1

2

4-benzene tricarboxylic acid and 4hydroxy pyridine was characterized by 1H\|NMR

IR and elemental analysis.Supramolecular fiber with length of several centimeters was formed by pulling up the melting sample of the gelator

indicating a strong interaction of the molecules.Three supramolecular hydrogels were obtained via cooling the gelator aqueous solutions at 25℃

0℃ and at 25℃ under ultrasonic treatment

respectively.The results indicated that the gelator molecules assembled into fibrillar networks during forming the gels with the network density and gel stability increased by the order of the above formation methods.The electron spectroscopic spectrum of the xerogel surface reveals that the nitrogen atom locates mainly within the fiber

indicating the molecular assembling in water is affected by the amphiphilic gelator molecule.The assembling fashion of the gelator was further investigated by analyzing the single crystal structures of the complex formed from 4-hydroxypyridine and ophthalic acid

and 1

2

4-benzene tricarboxylic acid

which shows that the molecules assembled into branched fiber via different hydrogen bonding.Moreover

the powder X-ray diffraction diagram of the xerogel indicates that the gelator molecules assembled in a preferred direction during forming the gel.