二苯基噻吩活性氧量子产率、杀虫活性及稳定性研究

 【方法】以α-三联噻吩（α-T）为对照，首次研究了二苯基噻吩活性氧量子产率、杀虫活性及稳定性。【结果】二苯基噻吩紫外光照射280 min后吸光度变化最大值为 A=0.438，α-T在200 min后吸光度变化值最大 A=0.480；二苯基噻吩和α-T对白纹伊蚊3龄幼虫24h的LC50值分别为9.18×10-3 ?g·ml-1和9.69×10-4 ?g·ml-1，对小菜蛾3龄幼虫LC50值分别为267.87 ?g·ml-1和 222.22 ?g·ml-1；二苯基噻吩和α-T在甲醇中半衰期为113.62 h和10.65 h。二苯基噻吩量子产率与α-T相当，对白纹伊蚊和小菜蛾具有较好的光活化毒杀作用，但稳定性好。【结论】二苯基噻吩克服了光活化杀虫剂稳定性差而难以在田间推广使用等不足，在杀虫的同时又能催化降解残留农药三唑磷，二苯基噻吩有广泛的开发和应用前景。

Study on Active Oxygen Quantum Yield, Insecticidal Activities and Stability of Diphenylthiophene

【Objective】Active oxygen quantum yield, insecticidal activities and stability of diphenylthiophene were compared to α-terthienyl in a study for the first time. 【Result】The results showed that absorbency variety max of diphenylthiophene was 0.438 after ultraviolet irradiation for 280 min while α-terthienyl absorbency variety max was 0.480 after ultraviolet irradiation for 200 min. LC50 value of diphenylthiophene and α-terthienyl against 3rd instar larvae of Aedes albopictus was 9.18×10-3 μg·ml-1 and 9.69×10-4 μg·ml-1 after 24 h of treatment. LC50 value of the two pesticides against 3rd instar larvae of Plutella xylostella was 267.87 μg·ml-1 and 222.22 μg·ml-1 after 24 h of treatment. The half-life of diphenylthiophene and α-terthienyl in methanol was 113.62 h and 10.49h. Quantum yield of diphenylthiophene and α-terthienyl was almost identical and they all had high toxicity to Aedes albopictus and Plutella xylostella, but diphenylthiophene was stable than α-terthienyl. 【Conclusion】It is concluded that diphenylthiophene has avoided the deficiency of photoactivated insecticides which degraded quickly in the environment and could not apply in the farm. On the one hand diphenylthiophene could kill the insects, on the other hand diphenylthiophene could accelerate the degradation ratio of triazophos. Diphenylthiophene is worth exploiting and applying in the field.