Synthesis and properties of coumarin derivatives and their terbium complexes was written by Meng, Defen;Xu, De;Li, Dong;Dai, Ming;Li, Guizhi;Guo, Dongcai. And the article was included in Research on Chemical Intermediates in 2016.Formula: C9H10O4 This article mentions the following:
A series of coumarin derivatives obtained from salicylaldehyde and phenol were synthesized. Their corresponding terbium complexes were prepared and characterized by elemental anal., EDTA titrations, molar conductivity, UV-visible spectra, IR spectra, and thermal anal. The luminescent properties and electrochem. properties of the terbium complexes were also investigated. All the terbium complexes exhibited characteristic emissions of terbium ions. The introduction of electron-donating groups can improve the luminescent properties, decrease the HOM: O and LUMO energy levels of the terbium complex, while electron-withdrawing groups can weaken the luminescent properties, and increase the HOMO and LUMO energy levels of terbium complex. In the experiment, the researchers used many compounds, for example, 2-(4-Methoxyphenoxy)acetic acid (cas: 1877-75-4Formula: C9H10O4).
2-(4-Methoxyphenoxy)acetic acid (cas: 1877-75-4) belongs to ethers. Ether is less polar than esters, alcohols or amines because of the oxygen atom that is unable to participate in hydrogen bonding due to the presence of bulky alkyl groups on both sides of the oxygen atom. But ether is more polar than alkenes. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly autoxidize to form hydroperoxides and dialkyl peroxides. If concentrated or heated, these peroxides may explode. To prevent such explosions, ethers should be obtained in small quantities, kept in tightly sealed containers, and used promptly.Formula: C9H10O4
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem