jf0c00842_si_001.pdf (2.51 MB)
Preparation of Acifluorfen-Based Ionic Liquids with Fluorescent Properties for Enhancing Biological Activities and Reducing the Risk to the Aquatic Environment
journal contribution
posted on 2020-05-22, 15:47 authored by Gang Tang, Junfan Niu, Wenbing Zhang, Jiale Yang, Jingyue Tang, Rong Tang, Zhiyuan Zhou, Jianqiang Li, Yongsong CaoIn this work, 12 novel herbicidal
ionic liquids (HILs) based on
acifluorfen were prepared by pairing with the fluorescent hydrazides
or different alkyl chains for increasing activities and reducing negative
impacts on the aquatic environment. The results showed that the fluorescence
of coumarin hydrazide in the HILs was applied as the internal and
supplementary light source to meet the requirement of light wavelength
range of acifluorfen, which improved the phytotoxicity of acifluorfen
to weeds by enhancing singlet oxygen generation with increased sunlight
utilization. The herbicidal activities of HILs were related positively
with the length of chain of cation under high light intensity and
depended mainly on the fluorescence characteristic of the cation under
low light intensity, and the double salt IL forms of acifluorfen containing
coumarin hydrazide and n-hexadecyltrimethylammonium
had enhanced efficacies against broadleaf weeds in the field. Compared
with acifluorfen sodium, HILs had lower water solubility, better surface
activity, weaker mobility in soils, and higher decomposition temperature.
These results demonstrated that HILs containing different cations
provided a wider scope for fine-tuning of the physicochemical and
biological properties of herbicides and established a promising way
for the development of environmentally friendly herbicidal formulations.