A new kind of supramolecuIar building unit(defined as SBU)having two phenolic hydroxyl groups (proton donors)and two aromatic earbexyl groups(proton acceptors)was synthesized from 1
2
4
5-benzene tetraearboxylic acid and 4-hydmxy pyridine by a simple procedure.Based On1H—NMR
IR
EA and XRD analyses
the structure of SBU was defined.Under suitable conditions
supramolecular gels and fibers were formed from the building unit through multiple hydrogen bends between the donors and the aceeptors.These supramolecular structures demonstrated strong temperature dependant features.