Preparation And Application Of Environmental Response Organic Small Molecule Gel

In recent years there has been immense interest in studying stimuli-responsive gels derived from bw molecular mass gelators (supramolecular, or simply molecular gels), which could be used to realize accuracy control of the physical properties and various functions of supramolecular aggregates. Low molecular weight (LMW) gels such as physical gels or supramolecular gels have defined a significant research field for the past decades, and are of potential applications in variety of fields. Supramolecular gelators form self-assembled aggregates through non-covalent interactions like H-bonding, p-p stacking, donor-acceptor interactions, metal coordination, solvophobic forces (hydrophobic forces for gels in water) and van der Waals interactions. This kind of gels could easily respond to stimuli like photonics, sound, magnet, redox, ions, chemical reations and so on, and have considerable applications in diverse fields such as sensing external stimuli, novel templates, phase transfer cataryzed reactions, drug delivery and so on.Herein, we designed a novel stimuli-responsive LMW oganogel, and investigated its applications. Low molecular weight two component gels were obtained from naphthalenediimide undecane acid mixed with several aliphatic and aromatic diamines. The gelation properties and fluorescence of these two-component gels were studied. Specifically, the gel containing diaminoquinolin (DAQ) was sensitive to nitrite anfon. The absorbance and emission intensity of the gel in the visible range obviously decreased upon addition of aqueous solution of sodium nitrite. The faded gel changed to sediment after detecting and the organic acid could be recycled.