SPECTROSCOPIC STUDY OF THE COMPLEXATION OF AN AZA-15-CROWN-5 CONTAINING CHROMOFLUOROIONOPHORE WITH BA2+ AND CA2+ CATIONS

Authors
MATEEVA N ENCHEV V ANTONOV L DELIGEORGIEV T MITEWA M
Citation
N. Mateeva et al., SPECTROSCOPIC STUDY OF THE COMPLEXATION OF AN AZA-15-CROWN-5 CONTAINING CHROMOFLUOROIONOPHORE WITH BA2+ AND CA2+ CATIONS, Journal of inclusion phenomena and molecular recognition in chemistry, 20(4), 1994, pp. 323-333
Citations number
34
Categorie Soggetti
Chemistry,Crystallography
Journal title
Journal of inclusion phenomena and molecular recognition in chemistry → ACNP
ISSN journal
09230750
Volume
20
Issue
4
Year of publication
1994
Pages
323 - 333
Database
ISI
SICI code
0923-0750(1994)20:4<323:SSOTCO>2.0.ZU;2-Y
Abstract
The complexation of )phenyl]-4,7,10,13-tetraoxa-1-aza-cyclopentadecane with Ba2+ and Ca2+ cations was investigated spectrophotometrically an d spectrofluorometrically. The stability constants of the complexes fo rmed are: for Ba2+ log K-st = 3.17 +/- 0.01 (absorption) and log K-st = 2.95 +/- 0.03 (fluorescence); for Ca2+ log K-st = 3.71 +/- 0.02 (abs orption) and log K-st = 3.58 +/- 0.05 (fluorescence). Protonation of t he ligand leads to fluorescence quenching. AM1 and PPP quantum chemica l calculations were used to predict molecular geometry, proton affinit ies and the spectra of the compounds studied.