摘要
Two novel N-heterocycle-containing benzotriazole compounds, 5-（5-chloro-2-benzotriazolyl）-6-hydroxy-l,4-dimethyl-3-car- bonitrile-2-pyddone （2） and 4-（5-chloro-2-benzotdazolyl）-5-methyl-2-phenyl-3-pyrazolone （4）, were synthesized from reactant 4- chloro-2-nitroaniline via diazotization, azo coupling, reductive cyclization and acidification. Their structures were confirmed by Fr-IR, 1H NMR, mass spectroscopy and elemental analysis. Their spectral properties were investigated and compared with that of a common commercial benzotriazole UV absorber Tinuvin 326. It is found that the novel N-heterocycle-containing benzotriazole compounds exhibit sharp single peak in the range of 280-400 nm and have much higher molar extinction coefficients than that of Tinuvin 326. Their anti-UV protection properties on polyester fabric were also evaluated and compound 4 was much superior to compound 2 due to its higher exhaustion.
Two novel N-heterocycle-containing benzotriazole compounds, 5-（5-chloro-2-benzotriazolyl）-6-hydroxy-l,4-dimethyl-3-car- bonitrile-2-pyddone （2） and 4-（5-chloro-2-benzotdazolyl）-5-methyl-2-phenyl-3-pyrazolone （4）, were synthesized from reactant 4- chloro-2-nitroaniline via diazotization, azo coupling, reductive cyclization and acidification. Their structures were confirmed by Fr-IR, 1H NMR, mass spectroscopy and elemental analysis. Their spectral properties were investigated and compared with that of a common commercial benzotriazole UV absorber Tinuvin 326. It is found that the novel N-heterocycle-containing benzotriazole compounds exhibit sharp single peak in the range of 280-400 nm and have much higher molar extinction coefficients than that of Tinuvin 326. Their anti-UV protection properties on polyester fabric were also evaluated and compound 4 was much superior to compound 2 due to its higher exhaustion.
基金
supported by the National Natural Science Foundation of China(Nos.21106135 and 51173168)
Zhejiang Provincial Natural Science Foundation of China(Nos.Y4090227 and Y5080021)
Zhejiang Provincial Key Innovation Team(No.2010R50038)
