| Low molecular weight gels as self-assembly materials can be formed under the non-covalent bonding interactions which have been widely developed due to their potential applications in many fields,such as supramolecular science,materials science,catalysis,regenerative medicine,drug delivery,and so on.Volatile acids and organic amine vapors are important gaseous pollutants that can bring threaten the ecological environment and human health seriously.So far,several methods have been used to detect organic amines or acids in solution or gas,including electric chemical,gas chromatography and chemical sensors.Compared with other methods,fluorescence sensors have the advantages of high sensitivity,high selectivity and short response time.So,several new multifunctional soft materials with the response ability towards volatile acids and organic amine vapors will be provided to.The main research contents are as follows:?1?A new gelators 1 containing 4-dimethylaminocinnamaldehyde was designed and synthesized.The detection of limit for trifluoroacetic acid?TFA?by solution 1 in acetonitrile was 1.03×10-8 M with a corresponding association constant?K?of 6.85×104M-1.The detection of limit for triethylamine?TEA?by solution 1 in acetonitrile with 1.8eq.of TFA was 1.27×10-8 M with a corresponding association constant?K?of 4.027×104M-1.At the same time,xerogel 1 exhibited sensitive response abilities for volatile acids and organic amines.The fluorescence of xerogel 1 within 7 s could be quenched after contacting with a volatile acid and recovered within 15 s under further contacting with volatile amine The detection of limit of xereogel film 1 towards trifluoroacetic acid?TFA?gases was 3.2 ppb.Organogel 1 exhibited sensitive response abilities towards TFA and TEA,and then rapidly expressed signal of fluorescence,gel state and a change of color.This research would provide a new way fro fast and sensitive detection of volatile acids and organic amines.?2?Two new gelators?N12 and N18?containing naphthalimide group were designed and synthesized.The two gelators could form gels in different solvents,and different structures were formed and then exhibited hydrophobicity.The detection of limit for TEA in ethanol solution of N12 was 4.63×10-44 M,and that of Et2NH was 7.91×10-5 M as the control.The fluorescence of gelator could be recovered after acid was added again.This research would expand the application of supramolecular self-assembly materials in sensor field and offer a new detection method for organic amine vapors.?3?A new gelator 1 containing a quinoline group was synthesized and fully characterized.It was found that molecule 1 could self-assemble into different self-assembly structures with different surface wettabilities from super-hydrophilicity to super-hydrophobicity.More interesting,the fluorescence emission of gelator 1 in acetonitrile solution and the xerogel 1 formed in acetonitrile could reversibly respond to TFA and TEA.The detection limit for trifluoroacetic acid?TFA?by solution 1 in acetonitrile was 5.68×10-99 M.This research will provide a new way to design multi-functional soft matter materials that show a response to volatile acid and organic amine vapors. |
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