一、前言氟硅酸脲是防治小麦锈病的一种农药。用四氟化硅气体和尿素在甲醇溶液中制得无色透明的晶体,其化学式为[(NH_2)_2CO_4]·H_2SiF_4。氟硅酸脲在水中溶解度甚大,水溶液呈酸性,且挥发较慢,有很好的药效。在相同的氟硅酸含量下,它与氟硅酸水溶液具有同等药效,但较其优越,因它能制成粉剂便于包装和运贮,且腐蚀性小。卫生部门关心此药的环境污染问题。通过结构分析,证实它是一种分子加成物,同 I. Introduction Fluconazole is a pesticide against wheat rust. A colorless and transparent crystal was obtained by using silicon tetrafluoride gas and urea in methanol solution. The chemical formula was [(NH_2) _2CO_4] · H_2SiF_4. Flufenosilicate is highly soluble in water, acidic in aqueous solution, and volatilizes slowly, with good pharmacodynamics. In the same fluorosilicic acid content, it has the same efficacy with fluosilicic acid aqueous solution, but its superior, because it can be made of powder for packaging and transportation and storage, and less corrosive. Health departments concerned about the drug’s environmental pollution problems. Through structural analysis, it is confirmed that it is a molecular adduct, with