Two new fluorescent molecules Ml and M2were designed and synthesized successfully in this paper. Tetraphenlyethylene (TPE) and8-hydroxy quinoline(8-HQ) were used as fluorescent group and accepter group respectively in both of the two fluorescent probes. Compound Ml was synthesized from the combining of TPE and8-HQ with two triazole moieties separately through click reaction and M2was obtained on the basis of structure of M1. The structures of the new products were characterized by1HNMR,ESI-Ms.In the synthesis of intermediate A2, We explored the best loading sequenceon the basis of the original literature.First, adde zinc powderd to4-methyl diphenyl ketone solution, make fully mixing into alcohols, and then at room temperature, injection of titanium tetrachloride, in the basis of simplified operation, improved the production rate. The synthetic conditions of Williamson were optimized in the experiments. The results showed that the optimal condition with the yield up to28.6%was:DMF as solvent, NaH as base and at room temperature. The optical properties of M1and M2with response to metal ions were systematically determined and studied by fluorescent spectrum. The results show that the M1itself has a high fluorescence intensity and is weak alkaline, so in weak acid, neutral and alkaline conditions, the fluorescence properties will not be subjected to interference.In THF/H2O (2:3, v/v) solution system,M1recognized selectively to Ag+and Fe3+with the presence of other metal and negative ions, and both form1:2complex. M1displays good selectivity and sensitivity for Ag+in the absence of Fe3+. The fluorescence intensity was quenched by33%and linearly decreased with the addition of Ag+. Moreover, the fluorescence spectrum of M1shows remarkable bathochromic shift with72nm with the addition of Fe3+Thus, M1can be used as a predominant fluorescence probe based on fluorescent quenching for Fe3+.Compound M2were discovered to behave excellent AIE property, but no response to all metal ions.so M2are not suitable as Fluorercence probes,... |