Study On Preparation And Characters Of Acylhydrazone And Azopyridine Derivative Gels With The Tripodal Structure

As a brand-new"soft material",low molecular weight gelators play a very important role in the preparation of various sensors,optical switches,biological materials and drug carriers.Based on the performance characteristics of acylhydrazone and azopyridine derivatives,a series of acylhydrazone derivatives and azopyridine gelators with the tripodal structure had been designed and synthesized in this dissertation.The performance of the gel was studied by scanning electron microscope?SEM?,X-ray diffraction?XRD?,fluorescence and so on.The work is now summarized as follows:?1?Two types of acylhydrazone derivatives L and M based on tripodal structure were constructed.Their structures were characterized by ¹H NMR and ¹³C NMR as the target products.The results showed that L can form a gel only in DMF solvent,and L-gel had light blue fluorescence with AIE effect.L can perform fluorescence recognition on Al³⁺,and the fluorescence can be adjusted in two mixed systems of DMSO/H₂O and DMF/H₂O.Through fluorescence attenuation,the L-Al³⁺system can identify oxalic acid.Moreover,the gelator M formed a gel only in CHCl₃,and emitted strong green fluorescence,which also had the AIE effect.The DMF solution of M can effectively recognize Zn²⁺by this character.M also had the effects of lyochromism,piezochromism and acid-induced discoloration.?2?Gelator T,based on the azopyridine derivatives,also had been synthesized.The performance of the gel was studied by FT-IR,XRD,SEM and so on.The study showed that gelator T only formed a light yellow transparent gel in n-propanol.T-gel could interact with three kinds metal ions to form the stable gel.At the same time,T-gel could be sensitive to hydrohalic acid and TFA,and detect volatile acid?TFA?and organic amine?TEA?continuously.This process can be repeated 5 times.?3?Based on tri-?bromomethyl?benzene as the central element,two types of ionic azopyridine derivatives P and Q were synthesized.It was found that gel ator P formed a red organic gel only in DMF,and P-gel was relatively stable to strong acids?pH=1?and strong bases?pH=14?.0.125 g/ml P solution can absorb methyl orange and Congo red to form the stable gel,respectively.And Q can form a gel in a variety of solvents.The results showed that Q-gel could maintain the gel state in methylene chloride,n-propanol,n-butanol,and 1,4-butanediol after ultrasound.It was also found that both P-gel and Q-gel can form stable gels with Al³⁺,Ca²⁺,Cu²⁺,Ni²⁺,Co²⁺,Fe³⁺metal ions,respectively.