Abstract
Complexation of a series of flavonols with Mg2+, Ca2+, and Ba2+ ions was studied by FAB mass spectrometry. The mass spectra of flavonol solutions containing magnesium ions revealed formation of 1 : 2 complexes MgL2, undetectable by spectrophotometric and spectrofluorimetric methods. Experiments with a crown-substituted flavonol revealed formation of not unly previously known chelate complexes MgL and Mg2L, but also of the 1 : 2 complex MgL2 and crown complex MgHL. The barium ions form with the crown-substituted flavonol two types of “sandwich” complexes: Ba(HL)2 and Ba2(HL)2. With the Ca2+ ions, such complexes are not formed, and only the fragmentation product of the complex Ca(HL)2 was detected.
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