Rare earth chelates of benzoyl urea derivatives were prepared in ethanol and fluorescence spectra of these chelates were studied in detail. A composition of [RE(BU)_3Phen] (NO_3)_3 was obtained. Correlation between ch...Rare earth chelates of benzoyl urea derivatives were prepared in ethanol and fluorescence spectra of these chelates were studied in detail. A composition of [RE(BU)_3Phen] (NO_3)_3 was obtained. Correlation between chemical properties of ligands, chelates and spectroscopy was discussed. Intramolecular energy transfer in rare earth chelates was explained.展开更多
文摘Rare earth chelates of benzoyl urea derivatives were prepared in ethanol and fluorescence spectra of these chelates were studied in detail. A composition of [RE(BU)_3Phen] (NO_3)_3 was obtained. Correlation between chemical properties of ligands, chelates and spectroscopy was discussed. Intramolecular energy transfer in rare earth chelates was explained.
文摘以α-甲氧基乙酸甲酯、甲酸乙酯和取代苯甲酸为起始原料,经过环化、Dimroth重排和亲核加成等反应,合成了一系列结构新颖的N-取代苯甲酰基-N′-4,7-二甲氧基-[1,2,4]三唑并[1,5-c]嘧啶(硫)脲类化合物11a^11q.目标化合物的结构通过IR、1 H NMR、13C NMR和元素分析进行了确认.初步生物活性测试结果表明,在50 mg·L^-1下,大部分化合物具有一定的杀菌活性,其中N-(2-氯苯甲酰基)-N′-4,7-二甲氧基-[1,2,4]三唑并[1,5-c]嘧啶硫脲(11m)对黄瓜灰霉菌的抑制率为67.25%.化合物均对2~3龄库蚊幼虫表现一定的昆虫生长调节活性,7个化合物的校正未羽化率高于70%,其中N-(4-甲基苯甲酰基)-N'-4,7-二甲氧基-[1,2,4]三唑并[1,5-c]嘧啶硫脲(11l)的校正未化蛹率和校正未羽化率均达100%,与对照药剂5%(质量分数)吡丙醚乳液相当.构效关系研究表明,苯环上吸电子基团的引入有利于杀菌活性的提高,而给电子基团的引入则有利于昆虫生长调节活性的提高.苯甲酰基脲类化合物11a^11i的杀菌活性普遍优于苯甲酰基硫脲类化合物11j^11q,而苯甲酰基硫脲类化合物则表现出更好的昆虫生长调节活性.
