The Ultraviolet Absorption Spectra of Pyrazoles and 1-Carboxamidepyrazoles and Their Application
SHI Yun-feng1, 2,WU Zhi-jie1*,CHEN Li-jun1,CHEN Guang3,LIU Yao-peng1, 2,ZHANG Li-li1, 2
1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China 3. Shenyang Research Institute of Chemical Industry, Shenyang 110021, China
Abstract：The ultraviolet absorption spectra of pyrazoles and 1-carboxamidepyrazoles were studied. The results indicated that substitution in the 3 or the 5 position it leads to a bathochromic shift of the position of the maximum absorption by about 3-4 nm, whereas in the 4 position leads to a much larger bathochromic shift (>10 nm). The introduction of carboxamide causes a bathochromic shift of the position of the maximum absorption by about 20-26 nm. Its also leads to an increase in molar extinction coefficient by about 2-3 times. So UV methods were established for determining the contents of pyrazoles and their derivations. Using these methods, the content of 3，4-dimethylpyrazole phosphate (DMPP) in stabilized urea was determined to be 1.15% of urea-N, the hydrolytic half lives of 1-carboxamide-3-methylpyrazole (CMP) in water solution at 20, 25 and 30 ℃ were 48, 30 and 16 h, respectively, and the extraction percentage of nitrification inhibitor 3-methylpyrazole phosphate (MPP) in 3 soils by 3 different extractants were ranged from 63.2% to 89.2%.
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