The Synthesis of Novel Macrocycles, Part V. The Coumarin Crown Ethers and Cation Binding with Fluorescence Spectra

The synthesis of novel crown ethers, part ix, 3‐phenyl chromenone‐crown ethers

“…However, 7,8-dioxa derivatives have exhibited CEFS upon cation complexing while the 6,7-dioxa-chromenones gave CEQFS as they are complexed in AN. Similar behaviours were also observed from other derivatives of such chromophore structures in our earlier studies [8][9][10]. The Synthesis of Novel Crown Ethers EXPERIMANTAL The starting chemicals were from MERCK or FLUKA unless otherwise cited.…”

“…The crown ether derivatives of the 4-H and 4-methyl-6,7-dihydroxy-and -7,8-dihydroxycoumarins displayed the binding effect of alkali cations on the fluorescence emission spectra. They exhibited good agreements on the cation radii and the macrocyclic molecule size as reported [8][9][10]. The chromophore ethers were mostly capable of displaying the effect of the cation via UV-VIS spectra due to the restriction on the π-electron flow [11].…”

“…The Synthesis of Novel Crown Ethers EXPERIMANTAL The starting chemicals were from MERCK or FLUKA unless otherwise cited. Initial compounds, 1c -1d were available from our earlier studies [8][9][10][11]. IR spectra were taken as KBr pellets with a JASCO FT-IR spectrometer, model-5300.…”

“…We have recently synthesised various crown ethers with different chromophore moieties and reported their cationic interactions using steady state fluorescence spectroscopy in acetonitrile [8][9][10]. The crown ether derivatives of the 4-H and 4-methyl-6,7-dihydroxy-and -7,8-dihydroxycoumarins displayed the binding effect of alkali cations on the fluorescence emission spectra.…”

“…The present work deals with the preparation of the novel crown ethers bearing 3-phenylcromenone moieties, which were studied with fluorescence spectroscopy to investigate cation complex formation with Li + , Na + , K + , and Rb + perchlorates [8][9][10][11].…”