Synthesis and photophysical properties of a 2,2′-bianthracene-based receptor bearing two aza-15-crown-5 ethers for naked-eye detection of barium ion was written by Kondo, Shin-ichi;Takahashi, Takuya;Takiguchi, Yuji;Unno, Masafumi. And the article was included in Tetrahedron Letters in 2011.COA of Formula: C10H21NO4 This article mentions the following:
As a novel chromofluorophore, 9,9′-dimethyl-2,2′-bianthracene, was successfully synthesized by reductive coupling of 2-chloro-9-methylanthracene. Absorbance and fluorescence maxima of 9,9′-dimethyl-2,2′-bianthracene can be shifted to visible-region comparing to the former 2,2′-binaphthyl-based receptors. Receptor I bearing aza-15-crown-5 moieties via methylene spacer provides selective UV-visible and fluorescence responses for Ba2+ due to the restriction of the conformational change through the formation of an intramol. sandwich-complex by two azacrown ethers, resulting in the presence of Ba2+ that can be detected by naked eye in aqueous acetonitrile. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3COA of Formula: C10H21NO4).
1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3) belongs to ethers. The oxygen atom in ethers are more electronegative than carbon, thus the hydrogens which are alpha to the ethers are more acidic than the simple hydrocarbons. At room temperature, ethers are pleasant-smelling colourless liquids. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive, and as a result they are useful as solvents for fats, oils, waxes, perfumes, resins, dyes, gums, and hydrocarbons. Vapours of certain ethers are used as insecticides, miticides, and fumigants for soil.COA of Formula: C10H21NO4
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem