Metal ion complexation in acetonitrile by di-ionized calix[4]arenes bearing two dansyl fluorophores View Full Text


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Article Info

DATE

2008-09-09

AUTHORS

Ümmühan Ocak, Miraç Ocak, Kazimierz Surowiec, Richard A. Bartsch, Maryna G. Gorbunova, Chuqiao Tu, Malgorzata A. Surowiec

ABSTRACT

The influence of metal cations (Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Sr2+, Ba2+, Ag+, Cd2+, Co2+, Fe2+, Hg2+, Mn2+, Pb2+, Zn2+ and Fe3+) on the spectroscopic properties of two dansyl (1-dimethylaminonaphthalene-5-sulfonyl) groups linked to the lower rims of a series of three, structurally related, di-ionized calix[4]arenes was investigated by means of absorption and emission spectrophotometry. Di(tetramethylammonium) salts of the di-ionized ligands, (TMA)2L1, (TMA)2L2 and (TMA)2L3, which differ in having zero, two and four tert-butyl groups, respectively, on the upper rim of the calix[4]arene scaffold were utilized for the spectrofluorimetric titration experiments in acetonitrile. On complexation by alkaline earth metal cations, both the absorption and emission spectra undergo marked red shifts and quenching of the dansyl fluorescence. These effects are weaker with alkali metal cations. Transition metal cations interact strongly with the ligands. In particular, Fe3+, Hg2+ and Pb2+ cause greater than 97% quenching of the dansyl fluorescence in the di-ionized ligands. More... »

PAGES

131-139

References to SciGraph publications

  • 1999-08. Fluorescent Molecular Recognition and Sensing System of Bis-Dansyl Modified γ-Cyclodextrins in JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
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    http://dx.doi.org/10.1007/s10847-008-9497-2

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