Cation enhanced trans-cis photoisomerization in lariat azacrown ethers was written by Kumar, Perepogu Arun;Srinivas, Uppalanchi;Rao, V. Jayathirtha. And the article was included in Current Organic Chemistry in 2010.HPLC of Formula: 66943-05-3 This article mentions the following:
The authors describe the synthesis and effect of complexation on photochem. E (trans) to Z (cis) isomerization of lariat azacrown ethers. Lariat azacrown ethers-Ca2+ complexes are characterized by UV-visible, 1H-NMR and fluorescence techniques. Photostationary state composition of E-Z isomers upon irradiation under direct excitation and complexation with Ca(ClO4)2, quantum yield of photoisomerization, and fluorescence properties are described. Anomalous increase in the quantum yields were observed for lariat azacrown ether-Ca2+ complexes. Fluorescence studies indicated that the highly polarized/charge transfer nature of the singlet excited state is involved in E (trans) to Z (cis) isomerization process. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3HPLC of Formula: 66943-05-3).
1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3) 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. Ethers are good solvents partly because they are not very reactive. Most ethers can be cleaved, however, by hydrobromic acid (HBr) to give alkyl bromides or by hydroiodic acid (HI) to give alkyl iodides.HPLC of Formula: 66943-05-3
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem