期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 86, 期 9, 页码 6314-6321出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.1c00105
关键词
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资金
- DST-SERB [EMR/2017/003720]
- CSIR, India
A pair of new macrocyclic azobenzenes have been thoroughly characterized and one compound shows quantitative conversion from the E- to the Z-form, as well as an unusual instant switching from the Z-form to the E-isomer in the presence of Cu2+ ions in the dark. The Cu2+ complex can remain in the Z-form under constant UV radiation, reverting to the E-form once UV exposure ceases.
The classical photoswitch azobenzenes reversibly interconvert between the E- and the Z-isomers with light. Here, we report a pair of new macrocyclic azobenzenes characterized thoroughly by spectroscopic methods and single crystal X-ray diffraction structures, and one of the compounds displays a quantitative conversion of the E- to the Z-form. These compounds, besides their normal photoswitching behavior, display an unusual instant switching of the Z-form to the E-isomer in the presence of Cu2+ ions in the dark under 273 K. The Cu2+ complex can stay in the Z-form under constant UV radiation. However, it reverts to the E-form as soon as the exposure to the UV is ceased. The same phenomenon is also observed with Ag(+ )ions albeit it is a bit slower. This unusual instant switching of the azobenzene systems with metal ions prompted the detailed studies to unravel the reason behind this behavior.
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