meso-(4-(N,N-Dialkylamino)phenyl)-Substituted Subporphyrins: Remarkably Perturbed Absorption Spectra and Enhanced Fluorescence by Intramolecular Charge Transfer Interactions was written by Inokuma, Yasuhide;Easwaramoorthi, Shanmugam;Yoon, Zin Seok;Kim, Dongho;Osuka, Atsuhiro. And the article was included in Journal of the American Chemical Society in 2008.Reference of 66943-05-3 This article mentions the following:
B Meso-(4-(N,N-dibenzylamino)phenyl)-substituted subporphyrins were synthesized by Buchwald-Hartwig amination protocol. Substitution of the amino group at the 4-position of the meso-Ph substituent resulted in a remarkable red shift in the absorption spectra and drastic enhancement of fluorescence intensity probably as a consequence of intramol. CT interaction. These characteristics were used to construct a cation-sensing system by appending a 1-aza-15-crown-5 unit to subporphyrin that displays large spectral changes upon cation binding. In the experiment, the researchers used many compounds, for example, 1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3Reference of 66943-05-3).
1,4,7,10-Tetraoxa-13-azacyclopentadecane (cas: 66943-05-3) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.Reference of 66943-05-3
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem