96574-05-9Relevant academic research and scientific papers
Chromoionophores, VII. Podands Carrying Terminal Electron-Donor- and -Acceptor Groups. Cation-Influenced Charge Transfer Absorption
Loehr, Hans-Gerd,Voegtle, Fritz
, p. 914 - 921 (2007/10/02)
The synthesis and spectroscopic investigation of the new noncyclic neutral ligands 12-20 of the glycol ether type (podands) carrying terminal electron-donor- and -acceptor groups are described.The podands show intramolecular charge transfer interactions which can be influenced selectively by complexed cations.The ligands 13 and 20 cause significant increases of extinction and bathochromic shifts of the charge transfer bands in the UV/Vis spectra on addition of alkali perchlorates, whereas the shorter ligands 14 and 18 show a decrease of extinction and hypsochromic shifts under similar conditions.Some of the noncyclic chromoionophores discern considerably and visually perceivably between Na+ and K+ or Li+ and Na+, respectively, in acetonitrile.The cation selective alterations in the electron spectra are discussed in view of steric effects considering some complex stability constants determined by photometric titrations.
