含双1,3,4-噁二唑类荧光化合物的合成及荧光性能

在丙基磷酸酐催化条件下,由对甲基苯甲酸和取代苯甲酰肼通过环合反应得到含甲基的1,3,4-噁二唑单环,经高锰酸钾氧化反应得到单环1,3,4-噁二唑芳香酸;然后再次利用丙基磷酸酐的催化效应,实现芳香酸与邻羟基苯甲酰肼的环合反应,制备得到含双1,3,4-噁二唑结构的荧光化合物.利用红外光谱仪和核磁共振谱仪表征了合成产物的结构,并测定了产物的元素组成和荧光性能.结果表明,各合成产物的总收率为44%～49%;目标化合物具有较大的Stokes位移.

Synthesis and fluorescent properties of compounds with bis-1,3,4-oxadiazoles

The 1,3,4-oxadiazoles intermediates containing a methyl function group were afforded from 4-toluic acid and substituted aryl hydrazine in the presence of propylphosphonic anhydride as the catalyst.Resultant 1,3,4-oxadiazoles intermediates were then oxidized by potassium permanganate to obtain corresponding single-ring carbolic acids.Finally,desired bis-1,3,4-oxadiazoles compounds were obtained via cyclization reaction between the single-ring carbolic acids and o-hydroxyl benzoylhydrazine still in the presence of propylphosphonic anhydride catalyst.The structure of the products was characterized by means of infrared spectrometry and nuclear magnetic resonance spectroscopy.Moreover,the elemental composition and fluorescent properties of as-synthesized products were analyzed.Results indicate that various products are synthesized in a yield of 44%-49%;and the final target compounds possess large Stokes shifts.