ISSN:
1573-1111
Keywords:
Aza-15-crown-5
;
chromoionophore
;
fluoroionophore
;
complex formation
;
alkali and alkaline earth metal ions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The complexation of 1-[(4-benzothiazolyl)phenyl]-4,7,10,13-tetraoxa-1-aza-cyclopenta-decane with Ba2+ and Ca2+ cations was investigated spectrophotometrically and spectrofluorometrically. The stability constants of the complexes formed are: for Ba2+ logK st=3.17±0.01 (absorption) and logK st=2.95±0.03 (fluorescence); for Ca2+ logK st=3.71±0.02 (absorption) and logK st=3.58±0.05 (fluorescence). Protonation of the ligand leads to fluorescence quenching. AM1 and PPP quantum chemical calculations were used to predict molecular geometry, proton affinities and the spectra of the compounds studied.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00708877
