Lv, Yongjun; Guo, Yong; Xu, Jian; Shao, Shijun published an article in 2011, the title of the article was Simple indole-based colorimetric sensors with electron-withdrawing chromophores: Tuning selectivity in anion sensing.Related Products of 75629-62-8 And the article contains the following content:
Three simple colorimetric anion sensors containing anthrone, 1,3-indanedione, and malononitrile as signaling chromophores and an indole binding site were designed and synthesized. The introduction of electron-withdrawing groups can not only provide chromogenic signal output, but also tune the sensitivity and selectivity of indole-based anion sensors by electron push-pull features. Their anion binding and sensing properties were studied in detail by dramatic color changes, UV-visible absorption, and 1H NMR. As results revealed, sensor I showed high selectivity for F- over AcO- and H2PO4- with a distinct change in color due to the deprotonation of indole NH group. The excellent selectivity of I for F- can be attributed to the fitness in the acidity of its NH-group, which is tuned to be able to distinguish the subtle difference in the affinity of F-, AcO-, and H2PO4- to NH proton. The experimental process involved the reaction of 2-((1H-Indol-3-yl)methylene)malononitrile(cas: 75629-62-8).Related Products of 75629-62-8
The Article related to indole based colorimetric sensor electron withdrawing chromophore, fluoride acetate dihydrogen phosphate sensing indole derivative colorimetric, Inorganic Analytical Chemistry: Determinations and other aspects.Related Products of 75629-62-8
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts